Fuel Combustion CO2e Calculator (Scope 1 Stationary and Mobile, kg CO2e by Fuel)

How the calculator works

The tool follows the same path a greenhouse gas inventory takes for combustion, one fuel at a time, and it shows every step so nothing is hidden. You add a fuel row, enter the quantity and its unit, set whether the source is stationary or mobile, and it fills the heating value and the emission factors for that fuel. It converts the quantity to energy in gigajoules, multiplies the energy by the carbon factor to get fossil CO2, multiplies the same energy by the methane and nitrous oxide factors to get those two gases, and converts all three to a single CO2e figure using the global warming potentials. The total sits at the top in tonnes, with the fossil CO2, the methane, the nitrous oxide, the energy input, and a biogenic line under it, and the bar chart shows which fuel contributes most.

The formula is worth stating plainly, because it is the whole of the arithmetic. Quantity times heating value is the energy in GJ. Energy times the CO2 factor in kg per GJ is the fossil carbon dioxide. Energy times the methane factor and energy times the nitrous oxide factor give those gases in kilograms. CO2e is then fossil CO2 plus methane times its GWP plus nitrous oxide times its GWP, and dividing by 1000 reads it in tonnes. On the natural gas example, 10,000 therms is 53.06 t of fossil CO2, and because a boiler emits very little methane or nitrous oxide, those two add only about 0.03 t of CO2e each, so the total is about 53.12 tCO2e. The carbon dioxide does almost all the work, but the two trace gases still count and the tool never drops them.

The carbon factor is the number that turns energy into carbon dioxide, and it is a stable physical property of the fuel. The tool ships the common values on an energy basis, in kilograms of CO2 per gigajoule: natural gas 56.1, LPG or propane 63.1, gasoline 69.3, diesel 74.1, fuel oil 77.4, petroleum coke 97.5, bituminous coal about 88.4, wood or biomass 112, and ethanol 71.4, with the last two flagged as biogenic. For the United States the same values appear per unit from the EPA Hub, so natural gas is 5.306 kg per therm, diesel 10.21 kg per gallon, gasoline 8.78 kg per gallon, and propane 5.72 kg per gallon. You pick the fuel and the tool fills the factor; override it when your supplier or your country publishes a better one.

Stationary and mobile change the methane and nitrous oxide factors, not the carbon dioxide. A steady flame in a boiler burns cleanly, so its methane and nitrous oxide are small: for petroleum fuels the stationary factors are about 0.003 and 0.0006 kg per GJ. An engine in a truck runs through many load and temperature cycles, so it emits more of both, and the nitrous oxide in particular is larger and depends on the vehicle technology and its emission controls. That is why the diesel example jumps from a rounding-error trace stream in a boiler to about 0.77 t of CO2e once you set the source to mobile. The carbon dioxide is identical either way, because the same litre of diesel holds the same carbon; only the trace gases move.

Biogenic carbon is the last piece the engine handles for you. When you burn wood, ethanol, or the biofuel share of a blended pump fuel, the carbon dioxide released was recently taken from the air by the plant, so the GHG Protocol reports it on a separate line and keeps it out of the Scope 1 total. Set the biogenic percent on the row and the tool splits the carbon dioxide accordingly, showing the biogenic CO2 on its own line while still counting the methane and nitrous oxide from that combustion inside Scope 1. The global warming potential set switches between AR5, the default with methane at 28 and nitrous oxide at 265, and AR6 at 29.8 and 273; for combustion the choice barely moves the total, but the tool asks you to state which one you used.

What Scope 1 is

Scope 1 is the direct greenhouse gas emissions from sources a company owns or controls, and for most companies that means combustion. The GHG Protocol splits a company’s emissions into three scopes so no source is counted twice: Scope 1 is the fuel you burn on site and in your vehicles, Scope 2 is the electricity, steam, heat, or cooling you buy, and Scope 3 is everything else in the value chain, from purchased goods to business travel to the use of the products you sell. This tool handles the combustion part of Scope 1, which covers the boiler, the furnace, the generator, the forklift, and the fleet. Process emissions and refrigerant leaks are also Scope 1 but are accounted separately and are not part of a fuel combustion calculation.

The reason combustion is Scope 1 rather than someone else’s problem is that you own the flame. You bought the diesel, you ran the generator, and the carbon came out of your stack or your tailpipe, so the emissions are unambiguously yours. This is what separates it from Scope 2: when you draw electricity, the fuel is burned off site by the utility, but when you run a boiler, you burn the fuel yourself. That directness is also why Scope 1 is usually the first thing a company can act on without waiting for anyone else. The activity data already sits in your fuel purchase records, and the levers, burning less, switching to a cleaner fuel, or electrifying a load, are all within your own operations.

Scope 1 matters because it is measurable, controllable, and often the part of a footprint a regulator looks at first. A company that reports emissions needs a defensible combustion number built from real fuel quantities and sourced factors, and that number feeds targets, disclosures, and reduction plans. It also sets up the rest of the inventory. Once you have a clean Scope 1 from your fuels and a Scope 2 from your electricity, you have the two scopes a company measures directly, which is where almost every greenhouse gas inventory begins before it reaches into the harder-to-measure Scope 3.

Stationary and mobile combustion

The tool asks whether a fuel is burned in a stationary source or a mobile one because the two differ in how much methane and nitrous oxide they release per unit of energy. Stationary combustion is a fixed installation: a boiler raising steam, a furnace melting or drying, a generator holding backup power, a kiln, a heater. The flame is steady and well tuned, so combustion is close to complete and the trace gases are small. Mobile combustion is an engine in motion: a truck, a van, a forklift, a piece of off-road equipment. It runs through starts, idles, accelerations, and varying loads, and its exhaust chemistry shifts with all of them, so it emits more methane and considerably more nitrous oxide than a boiler burning the same fuel.

The carbon dioxide does not change between the two. A gallon of diesel contains a fixed mass of carbon, and burning it releases that carbon as CO2 whether the diesel goes into a generator or a truck, so the carbon factor is the same for stationary and mobile. What changes is the methane and the nitrous oxide. For petroleum fuels the stationary factors are around 0.003 kg of methane and 0.0006 kg of nitrous oxide per GJ, while the mobile factors are higher and depend on the vehicle and its after-treatment. The nitrous oxide is the one to watch on the fleet, because catalytic converters and other controls can raise it, and at a global warming potential of 265 even a small mass of it turns into a meaningful CO2e figure.

The diesel example makes the effect concrete. Five thousand gallons of diesel is 51.05 t of fossil CO2 either way. In a stationary generator the methane and nitrous oxide would be a rounding error on top. Set the source to mobile, and the higher engine factors push the methane and nitrous oxide to about 0.77 t of CO2e together, so the total climbs to about 51.82 tCO2e. That is a small share of the whole, because CO2 still dominates, but it is not zero, and choosing the right source type is what makes the trace-gas part of the number correct. Use stationary for anything bolted down and mobile for anything with wheels or tracks, and if a fuel feeds both, split it into two rows.

The emission factor and where it comes from

An emission factor converts an activity into emissions, and for combustion there are three of them per fuel: one for carbon dioxide, one for methane, and one for nitrous oxide. The carbon factor is the sturdy one. It is a physical property of the fuel, set by how much carbon the fuel holds and how completely it burns, so it barely varies between sources or years. The tool expresses it on an energy basis, in kilograms of CO2 per gigajoule, which is why it also needs a heating value to turn your litres, therms, or kilograms into energy first. Natural gas is 56.1, diesel 74.1, gasoline 69.3, LPG 63.1, fuel oil 77.4, coal about 88.4, petroleum coke 97.5, and wood 112, the higher numbers reflecting more carbon per unit of energy.

The factors ship from published sources so you start on solid ground. The carbon values follow the US EPA Emission Factors Hub, which also gives the convenient per-unit numbers on a higher heating value basis: 5.306 kg per therm for natural gas, 10.21 kg per gallon for diesel, 8.78 for gasoline, and 5.72 for propane. The methane and nitrous oxide factors follow the IPCC 2006 guidelines, which is where the stationary and mobile split comes from. For markets that publish their own sets the same energy-basis logic applies: Mexico uses the INECC and RENE factors with CONUEE heating values, and Brazil uses the Programa Brasileiro GHG Protocol and MCTI factors, both of which land on similar per-litre numbers once you apply the local heating value.

Every factor is editable on its own row for good reason. Your supplier may report a specific heating value for the gas you actually buy, your country may publish an official national set that a formal inventory has to use, and the value can shift as methods are updated. The tool fills a sound default when you pick a fuel, but it treats that as a starting point you confirm rather than a fixed truth. Showing the carbon factor, the heating value, and the trace-gas factors on the row is deliberate: a Scope 1 figure is only defensible if the numbers that turned fuel into tonnes are visible and sourced, so anyone reviewing the inventory can see exactly what you used and check it against the official value for your fuel and region.

CO2, CH4, N2O, and what CO2e means

Burning a fuel releases three greenhouse gases that matter for an inventory: carbon dioxide, methane, and nitrous oxide. Carbon dioxide is by far the largest, because almost all the carbon in the fuel leaves as CO2. Methane is the small amount of fuel that escapes unburned or partially burned, and nitrous oxide forms from nitrogen in the air and the fuel at combustion temperatures. The two trace gases are tiny in mass next to the carbon dioxide, but they are far more potent per kilogram, so they are not safe to ignore, and the tool computes all three from the fuel energy and its factors rather than assuming the trace streams away.

CO2e, carbon dioxide equivalent, is how the three are added into one number. Each gas is multiplied by its global warming potential, the factor that expresses how much warming it causes over 100 years relative to carbon dioxide, and the products are summed. Methane has a global warming potential of 28 under AR5, so one kilogram of methane counts as 28 kilograms of CO2e; nitrous oxide is 265, so one kilogram counts as 265. The formula the tool uses is fossil CO2 plus methane times 28 plus nitrous oxide times 265, all in kilograms, then divided by 1000 for tonnes. This is why a small mass of nitrous oxide from a diesel fleet can still show up as a few tenths of a tonne of CO2e once the potential is applied.

For combustion the mix is heavily weighted to carbon dioxide, which has two practical consequences. First, getting the carbon factor and the heating value right matters most, because they drive the large share of the answer. Second, the choice of global warming potential set, AR5 or AR6, changes the total very little, because it only reweights the small methane and nitrous oxide streams. The AR5 versus AR6 example shows it: moving the diesel fleet’s nitrous oxide from a potential of 265 to 273 shifts the total from about 51.82 to about 51.84 tCO2e, a difference you would struggle to see. The point is not that the potential set is irrelevant; it is that you should state which one you used, because a reviewer expects to know, even though for combustion the number hardly moves.

Biogenic CO2 and blended fuels

Not all combustion carbon is treated the same way. When you burn a fossil fuel, the carbon has been locked underground for millions of years and burning it adds new carbon dioxide to the atmosphere, so it counts in full. When you burn wood, ethanol, or biodiesel, the carbon was pulled from the air by the plant within the last growing seasons, so releasing it is closer to a return of recent carbon than a net addition. The GHG Protocol handles this by reporting biogenic carbon dioxide on a separate line and keeping it out of the Scope 1 total. It is disclosed, not hidden, but it does not inflate the fossil footprint.

The important subtlety is that only the carbon dioxide is biogenic. The methane and nitrous oxide from burning biomass still count inside Scope 1, because those gases are not part of the simple carbon cycle the way the carbon dioxide is. The tool models this exactly. Burn 100 metric tons of wood and the 174.72 t of carbon dioxide is carved onto the biogenic line, reported separately, while the methane and nitrous oxide from that same wood, which are larger per unit of energy than for a clean gas flame, stay in the Scope 1 total at about 2.96 tCO2e. So burning wood is not a free pass: the CO2 is biogenic and sits outside the total, but the trace gases are still yours to report.

Blended pump fuels make this a daily concern in some markets rather than a special case. In Brazil the diesel sold at the pump is diesel B, which carries a mandatory biodiesel share, and the gasoline is gasoline C, which carries anhydrous ethanol; since August 2025 the mandates are B15, fifteen percent biodiesel, and E30, thirty percent ethanol. That means part of every litre is already biogenic. Set the biogenic percent on the row to match the blend, and the tool splits the carbon dioxide so the fossil part goes into Scope 1 and the biofuel part goes onto the biogenic line. Enter a blended fuel as fully fossil and you overstate the Scope 1 total; drop the biofuel entirely and you fail to disclose the biogenic carbon the standard asks for.

Units and heating values

The most common combustion error is not a wrong factor but a wrong unit, so the tool works in energy and asks for the heating value that gets you there. Fuels are sold in a jumble of units: natural gas in therms, cubic feet, cubic metres, or mmBtu; diesel and gasoline in litres or gallons; propane in litres, gallons, or kilograms; coal and wood in tonnes. Each of these carries a different amount of energy, so the tool multiplies your quantity by a heating value in GJ per unit to convert to energy first, then applies the energy-basis carbon factor. That two-step conversion is what lets the same carbon factor serve every unit, and it is why the heating value sits on the row next to the factor.

Natural gas is where unit slips do the most damage, because therms and mcf are close enough in everyday speech to be confused but far apart in energy. A therm is 100,000 Btu; a thousand cubic feet, an mcf, is roughly ten therms. Enter a gas quantity in mcf into a field expecting therms, or the reverse, and the answer is off by about a factor of ten. The one-fuel-three-units example is built to show the safe version of this: 1,000 therms of natural gas, its equivalent in mcf, and its equivalent in mmBtu all convert to the same energy and therefore the same carbon dioxide, as long as the quantity and its unit are set to match. The tool lands on the same number for all three because it converts to GJ before it multiplies.

Heating value itself has a wrinkle worth knowing. Fuels can be quoted on a higher heating value or a lower heating value basis, which differ by whether the energy in the water vapour from combustion is counted, and the two can sit several percent apart. The EPA Hub per-unit factors are on a higher heating value basis, and some national sets use the lower heating value, so a factor and a heating value should come from the same basis. If your gas bill states a heating value, use it, because it reflects the actual gas delivered to you rather than a generic average. Keeping the quantity, the unit, the heating value, and the carbon factor consistent on the row is what keeps the energy, and therefore the carbon, right.

From one fuel to a full footprint

A fuel combustion number is one part of a company footprint, not the whole of it. This tool gives you a clean, sourced Scope 1 from the fuel you burn, which is useful on its own when you want to size a single boiler, a generator, or the fleet, and which feeds the combined footprint when you put it next to your electricity. Scope 1 is the direct combustion; Scope 2 is the purchased electricity, steam, and heat; and Scope 3 is the wider value chain. Getting a defensible Scope 1 out of your fuel bills is the foundation the other scopes build on.

For the two scopes a company controls directly, the Scope 1 and 2 Carbon Footprint calculator builds the combined total, taking your fuels on the Scope 1 side and your electricity on the Scope 2 side and returning the tonnes with the split between them. For the electricity side in detail, one meter or one site at a time, the Electricity CO2e calculator multiplies kWh by the grid emission factor and reports the Scope 2 number. This fuel combustion tool is the direct-combustion companion to that electricity tool, so the natural workflow is to size each source in detail here and there, then combine them in the footprint tool. A Carbon Intensity calculator to normalize a total against revenue, units, or floor area, and a Waste Diversion Rate tool for the waste side of a disclosure, are planned for this silo; they are not built yet, so treat them as the workflow this hub will grow into rather than links to follow today.

The result also points to where a reduction comes from. If your Scope 1 is large, the levers are burning less fuel, tuning the combustion, switching to a cleaner fuel, or electrifying a load, and electrifying moves that load out of Scope 1 and into Scope 2, where a clean grid or a renewable purchase can finish the job. If your Scope 1 is dominated by the fleet, the mobile trace gases and the fuel choice are where the attention goes. For the broader picture of using less energy in the first place, the Energy Management hub covers efficiency and energy use in more depth. Size the combustion here, then decide where the tonnes actually are before you spend effort.

Five worked examples

Example 1: the base calculation, natural gas in a boiler

This one shows the whole method on a single stationary fuel. Burn 10,000 therms of natural gas in a boiler. The fossil carbon dioxide is 10,000 therms times 5.306 kg per therm, which is 53,060 kg, or 53.06 t. Because a boiler burns cleanly, the methane and the nitrous oxide are small, adding about 0.03 t of CO2e each, so the Scope 1 total is about 53.12 tCO2e, roughly 135,000 miles of driving. The lesson is that emissions equal activity data times a factor, and that the carbon dioxide does almost all the work while the two trace gases still count and are never dropped. Get the quantity and the carbon factor right first, because they drive the large share of the answer.

Example 2: a diesel fleet on the mobile setting

This case moves from a boiler to the fleet to show why the source type matters. Take 5,000 gallons of diesel. The fossil carbon dioxide is 51.05 t regardless of where it burns, because the carbon in the diesel is fixed. Set the source to mobile, and the methane and nitrous oxide factors climb to the engine values, with the nitrous oxide the larger of the two, so together they add about 0.77 t of CO2e and the total is about 51.82 tCO2e. In a stationary generator those trace gases would be a rounding error instead. The lesson is to switch the source to mobile for anything with wheels, because a vehicle engine emits more methane and nitrous oxide per unit of energy than a steady boiler, and that trace-gas difference is real even though CO2 still dominates.

Example 3: one fuel, three units

This case shows that the unit does not change the answer when it matches the quantity. Enter 1,000 therms of natural gas, then enter the same gas as its equivalent in mcf and again as its equivalent in mmBtu. All three convert to the same energy in gigajoules, so all three land on the same carbon dioxide, because the tool converts to energy before it applies the carbon factor. The lesson is that unit slips are the most common natural gas error: a therm and an mcf differ by about a factor of ten, so entering a quantity in mcf into a therms field, or the reverse, throws the result off by roughly ten times. Set the unit to match the quantity and the conversion takes care of the rest.

Example 4: biomass and the biogenic split

This case shows that burning wood is not zero. Burn 100 metric tons of wood. The carbon dioxide is 174.72 t, but because that carbon was recently taken from the air, it is biogenic and reported on its own line, kept out of the Scope 1 total. What stays in Scope 1 is the methane and the nitrous oxide from the same combustion, which are larger per unit of energy for biomass than for a clean gas flame, and they come to about 2.96 tCO2e. The lesson is that the biogenic rule applies only to the carbon dioxide: the CO2 sits outside the total on a separate line, but the trace gases from biomass are still Scope 1 and still yours to report, so wood combustion carries a real, if small, Scope 1 number.

Example 5: AR5 versus AR6 global warming potentials

This case shows how little the potential set changes a combustion total. Take the 5,000 gallon diesel fleet from the mobile example, whose nitrous oxide is about 2.66 kg. Under AR5 that nitrous oxide is weighted at a global warming potential of 265; switch to AR6 and it is weighted at 273. The total moves from about 51.82 tCO2e to about 51.84, a change too small to matter in practice. The lesson is that for combustion the choice between AR5 and AR6 is minor, because CO2 dominates and the potential set only reweights the small trace-gas streams. State which set you used, because a reviewer expects to know, but do not expect the number to swing on it the way a Scope 2 grid factor would.

Three expert tips

Separate biogenic carbon from fossil carbon

The carbon dioxide from biomass, ethanol, and biodiesel is biogenic and belongs on its own line outside the Scope 1 total, while the methane and nitrous oxide from the same combustion still count inside it. Set the biogenic percent on the row so the tool splits the carbon dioxide correctly, and the fossil total stays accurate while the biogenic carbon is still disclosed. This is not a rare edge case in every market: in Brazil the pump fuels are blended, so diesel B15 is fifteen percent biogenic and gasoline C E30 is thirty percent, which means part of every litre is already biofuel. Enter blended fuel as fully fossil and you overstate Scope 1; drop the biofuel and you hide biogenic carbon the standard asks you to report. The 100 metric tons of wood example, biogenic CO2 of 174.72 t reported separately with only about 2.96 tCO2e of trace gases in the total, shows the split working.

Match the source type and state your GWP set

Use the stationary setting for boilers, furnaces, generators, and kilns, and the mobile setting for the fleet and off-road equipment, because a vehicle engine emits more methane and considerably more nitrous oxide per unit of energy than a steady flame. The carbon dioxide is the same either way, but the trace gases are not, as the diesel example shows when it climbs from a rounding error to about 0.77 t of CO2e once you set the source to mobile. Then state whether you used AR5 or AR6 global warming potentials. For combustion the choice barely moves the total, since CO2 dominates and the potentials only reweight the small streams, but a reviewer still expects to see which set produced the number, so declare it rather than leaving it implicit.

Use national factors and real heating values

The carbon factor is a stable physical property of the fuel, but the exact value and the heating value behind it depend on where you are and what you actually bought. Use the EPA Hub for the United States, the INECC and RENE set for Mexico, and the Programa Brasileiro GHG Protocol and MCTI set for Brazil, and if a formal inventory requires the official national factors, switch to them. When your gas bill states a heating value, enter it, because it reflects the gas delivered to your meter rather than a generic average, and a per-litre or per-therm number that hides the heating value can quietly be several percent off. The tool shows the factor and the heating value on every row precisely so the number that turned your fuel into tonnes is visible and can be set to the official value for your fuel, region, and year.

Common mistakes to avoid

The first mistake is a unit slip, especially on natural gas. A therm and an mcf differ by about a factor of ten, so entering a gas quantity in the wrong unit throws the result off by roughly that much, which is why the tool converts everything to energy first and shows the unit on the row. The second is leaving a fuel on the wrong source type. A fleet burned on the stationary setting understates the methane and nitrous oxide, and while the carbon dioxide is unchanged, the trace-gas share is real, as the diesel example shows when it grows by about 0.77 t of CO2e on the mobile setting. Set stationary for fixed equipment and mobile for anything that moves.

A third mistake is mishandling biogenic carbon: entering a blended pump fuel as fully fossil overstates Scope 1, while dropping the biofuel entirely fails to disclose the biogenic carbon, so set the biogenic percent to the actual blend and let the tool split the carbon dioxide. A fourth is mixing bases, pairing a higher heating value factor with a lower heating value quantity, or a per-gallon factor with a per-litre quantity, which puts the energy off before any factor is applied. A fifth is treating the estimate as a filed inventory: the tool follows the GHG Protocol and uses published EPA and IPCC factors, but a formal filing such as the Mexico RENE needs the official national factors and a qualified reviewer. Match the unit, set the source type, split the biofuel, keep the bases consistent, and validate before you disclose, and the Scope 1 number will hold up.

Where this calculator fits

It suits anyone who needs a direct-combustion carbon number and has the fuel quantities to build it. A sustainability or ESG lead can take a year of fuel purchases, enter each fuel with its source type, read the Scope 1 in tonnes with the fossil, methane, nitrous oxide, and biogenic parts broken out, and produce a defensible figure for a footprint or a disclosure. An operations or facilities manager can size a single boiler, generator, or the fleet on its own, which is useful when you want to know which combustion source carries the emissions before you plan a change. A finance or compliance analyst can use the transparent, sourced factors to prepare an estimate for review before a formal inventory is filed.

This is the Scope 1 detail tool of the ESG and Compliance set, and it feeds the combined footprint. The Scope 1 and 2 Carbon Footprint calculator puts your fuel next to your electricity and returns the total with the split, and it is the place to go when you want the whole company number rather than one source. The Electricity CO2e calculator is the Scope 2 companion to this Scope 1 tool, sizing a single electricity bill against the grid factor. A Carbon Intensity calculator to normalize a total, and a Waste Diversion Rate tool for the waste side of a disclosure, are planned for this silo and named here for reference; they are not yet live, so treat them as the workflow this hub will grow into. The ESG and Compliance hub gathers the set as the tools go live, and for the energy side of the story, using less fuel and power in the first place, the Energy Management hub covers efficiency in more depth.

Frequently asked questions

Sources, disclaimer, and editorial transparency

The relationships used here are standard greenhouse gas accounting under the GHG Protocol Corporate Accounting and Reporting Standard. Quantity times the heating value gives the energy in GJ; fossil CO2 = energy times the CO2 factor in kg per GJ; CH4 and N2O = energy times their factors; and CO2e = fossil CO2 + CH4 times its GWP + N2O times its GWP, divided by 1000 for tonnes. Biogenic CO2 from biomass and the biofuel share of blended fuel is reported on a separate line and kept out of the Scope 1 total, while the CH4 and N2O from that combustion stay in Scope 1. The carbon factors follow the US EPA Emission Factors Hub on an energy basis (kg CO2 per GJ): natural gas 56.1, LPG or propane 63.1, gasoline 69.3, diesel 74.1, fuel oil 77.4, petroleum coke 97.5, bituminous coal about 88.4, wood or biomass 112 (biogenic), and ethanol 71.4 (biogenic), with per-unit US values of 5.306 kg per therm for natural gas, 10.21 per gallon for diesel, 8.78 for gasoline, and 5.72 for propane. The CH4 and N2O factors follow the IPCC 2006 guidelines and differ between stationary and mobile sources. The global warming potentials are AR5 (CH4 28, N2O 265) by default and AR6 (CH4 29.8, N2O 273) as an option. The worked numbers are computed from the inputs shown: 10,000 therms of natural gas is 53.06 t of fossil CO2 for about 53.12 tCO2e; 5,000 gallons of diesel is 51.05 t of fossil CO2, about 51.82 tCO2e on the mobile setting and about 51.84 under AR6; 1,000 therms entered as therms, mcf, and mmBtu land on the same energy and CO2; and 100 metric tons of wood is 174.72 t of biogenic CO2 reported separately with about 2.96 tCO2e of CH4 and N2O in Scope 1. This calculator and guide are built and reviewed by the OpsCalculators team; see our Editorial Policy for how each tool is researched, built, and tested.

Results are accurate for the formula and the factors above, and they are a management estimate, not a certified inventory. The tool converts the fuel you enter and cannot know every detail of your operations or the exact requirements of a given regulation; a formal filing such as the Mexico RENE, which has a 25,000 tCO2e reporting threshold, should use the official national factors and a qualified reviewer. Match each fuel quantity to a factor and heating value on the same basis, set the source type so the trace-gas factors are right, set the biogenic percent for blended fuel so the biogenic share splits out, and state which global warming potential set you used. See our full Disclaimer. OpsCalculators.com is operated by MAFHH INTERNATIONAL LTD. Your inputs are processed in your browser and are never stored; see our Privacy Policy.