RSC Box Blank Size Calculator (Corrugated Sheet Size and Dieline)

How the calculator works

The tool follows the same path a box goes through from a product to a purchase order: product to inside, inside to outside, outside to the flat blank, and blank to the sheet. You choose which end you are starting from with the dimensions-entered select. Pick Inside if you already know the clear space the box has to hold, Outside if you have the finished box footprint, or Product plus clearance if you want the tool to build the inside for you from the item and a per-side gap. Then enter the box length, width, and height in the order L x W x H, choose the flute so the board caliper fills in, and set the joint tab width, which is the glue flap that closes the box.

The first thing the tool settles is the set of three dimensions, inside, outside, and blank, because each one is used for a different job. Inside is what the product sees and where the fit is decided. Outside is the finished box footprint, what stacks on a pallet and what the next box sits against. The blank is the flat rectangle the plant cuts and scores before it is folded and glued. On the default, an inside of 12 x 10 x 8 in becomes an outside of 12.16 x 10.16 x 8.32 in once the C-flute caliper is added, and that outside becomes a flat blank of 46.02 x 18.48 in.

The blank is where the geometry lives. For a regular slotted case the flat sheet has to wrap all four walls around the box and then close top and bottom with flaps, so the blank length runs around the perimeter plus a glue tab, and the blank width is the box height plus the flaps. The tool computes the blank length as 2 x (L + W) + joint tab and the blank width as H + W, where each of the four flaps folds at half the box width so the two width-panel flaps meet in the center. On the default the blank length is 2 x (12.16 + 10.16) + 1.375, which is 46.02 in, and the blank width is 8.32 + 10.16, which is 18.48 in, with a flap depth of 5.08 in.

From the blank the tool works out the material. The board area per box is the blank length times the blank width, converted to square feet or square meters, so the default blank of 46.02 x 18.48 in is 5.905 ft2. If you enter a board price the tool multiplies the area by the price and adds the waste percent for a cost per box, and if you enter a master sheet size it lays the blank onto the sheet both ways and reports the better yield, the boxes per sheet and the trim waste. On the default, a 96 x 48 in master sheet yields 5 blanks at about 8% trim. The dieline on the canvas draws the flat blank with its scores, its slots, and its joint tab labeled, so you can check the layout before the plant does. All of this feeds the wider work in the Packaging Engineering silo and the Supply Chain hub, where the box size decides how a load fills a pallet and a trailer.

The RSC (0201) explained

The regular slotted case, RSC, is the most common corrugated box in the world, and its FEFCO code is 0201. It is a single flat blank scored into four wall panels and a glue tab, with four flaps on the top and four on the bottom, all cut to the same depth. The two flaps on the length panels and the two on the width panels fold in to meet, and because all eight flaps are the same depth, the flaps on the width panels meet in the center while the flaps on the length panels also meet in the center from the other direction. That single, symmetric cut is what makes the RSC cheap to make and quick to run, which is why it is the default shape for shipping cases.

The 0201 code comes from the FEFCO and ESBO catalog of standard corrugated designs, and it is adopted in Brazil by the ABPO, where the same box is called the caixa maleta or the caixa normal, never a B1. The style has three close relatives the tool also handles. The HSC, the half slotted case, has flaps on one end only, so it is an open tray or a box that takes a separate lid. The FOL, the full overlap, has flaps that run the full width of the box so they overlap completely across the top and bottom, which adds stacking strength and protects the contents at the flap seam. The tool switches the blank-width formula for each: RSC uses H + W, HSC uses H + W/2, and FOL uses H + 2W.

The RSC is measured inside, in the order length by width by height, and always from the center of one score to the center of the next. That center-to-center rule matters because the board has thickness, and a score is a crushed line the panel folds along, so the working dimension is the fold line, not the edge of the board. Getting the measuring convention right is the difference between a box that fits and one that is a caliper too small on every wall, which is the subject of a later section.

The flat blank, its scores, slots, and joint

The flat blank is the whole box before it is folded, and reading its layout is the fastest way to understand the formula. Lay the blank out long side across. Along its length, from the glue tab, the panels run in the order joint tab, L, W, L, W. Those four wall panels wrap the box, and the glue tab overlaps the first panel to close the tube. There is a score, a crushed fold line, at every panel boundary, so the blank has vertical scores separating the tab from the first L panel, the first L from the first W, and so on around the box.

Across the blank width run the flaps. Two horizontal score lines divide the blank into a top flap zone, the central wall zone, and a bottom flap zone. The central zone is the box height, and each flap zone is the flap depth, which for an RSC is half the box width so the flaps meet in the center. At every vertical panel score, the tool cuts a slot into the flap zones, a narrow removed strip that lets the flaps on the length panels and the width panels fold independently without fighting each other at the corners. The dieline on the canvas shows all of this: the outline of the blank, the dashed score and fold lines, the slot cuts at the panel boundaries, and the panel labels, joint, L, W, L, W.

The joint tab is the glue flap that closes the tube, and it is the one part of the blank that is not a box dimension. The tool defaults it to 1.375 in in imperial and 35 mm in metric, which is a typical manufacturer’s joint, and it is editable because plants vary between about 1.25 and 1.5 in depending on the joint type, glue, stitch, or tape. The joint tab is added once to the blank length, after the four wall panels, so on the default the blank length is the perimeter of 44.64 in plus the 1.375 in tab, which is 46.02 in. Because the tab is added only to the length, it does not touch the blank width or the flap depth.

Inside, outside, and the blank

The three dimension sets are easy to confuse, and confusing them is how a box ends up a caliper off. The inside dimensions are the clear space, what the product actually sits in, and they are where the fit and the protection are decided. The outside dimensions are the finished box footprint, what a carton stacks against on a pallet and what a case counter uses. The blank is neither: it is the flat sheet, larger than both, that folds up into the box. Each is derived from the one before it, so the order of the conversion is fixed.

Inside grows to outside by the board caliper, but not evenly on every axis, and this is the detail people miss. The length and the width each gain one caliper, because each wall is a single thickness of board added to the inside on that axis. The height gains two calipers, because the inner flaps fold in first and the outer flaps fold over them, so the top and bottom each add a thickness of board to the inside height. On the default, a C-flute caliper of 0.16 in turns an inside of 12 x 10 x 8 in into an outside of 12.16 x 10.16 x 8.32 in: length and width up by 0.16, height up by 0.32.

The blank is then built from the outside, because the blank has to wrap the finished box, not the clear space inside it. The blank length is 2 x (outside L + outside W) + joint tab, and the blank width is outside H + outside W with flaps at half the outside width. That is why the tool always shows all three sets in the result: you specify the inside for fit, you cut to the outside for stacking, and you order the blank the plant runs. Enter any one of the three and the tool fills in the other two, so the box you order is the box that fits.

Flutes and caliper

The flute is the wavy medium glued between the liners, and it sets the caliper, which is the board thickness that drives the inside-to-outside conversion. The tool presets the common flutes with their typical calipers: E flute at 0.06 in (1.5 mm), the thinnest, used for retail and small cases; B flute at a little over 0.12 in (3 mm); C flute at 0.16 in (4 mm), the default and the workhorse of shipping cases; A flute at 0.20 in (5 mm), the thickest single wall; and BC, a double wall at about 0.28 in (7 mm) that stacks two flutes for heavy loads. Pick a flute and the tool fills in the caliper, or choose Custom and type a measured value.

The flute matters here for two reasons at once. It sets how much the box grows from inside to outside, so a heavier flute pushes the outside and the blank out further, and it sets the board thickness that carries stacking strength, which is the domain of the Box Compression Strength Calculator. The blank perimeter and the caliper this tool reports are exactly the two inputs the McKee formula needs, so the two tools share a spec: size the box and read its blank and caliper here, then check whether that board carries the stack there. A box that just fits in E-flute may need resizing when you move it to C or to a double wall, because the extra caliper grows every dimension.

Real board varies, so if your supplier gives you a measured caliper, enter it as a custom value rather than trusting the preset. The caliper matters most when you are comparing flutes for the same box or when the box is tight against a master sheet, because a heavier flute both grows the blank and eats into the boxes-per-sheet yield. In metric markets the board is specified by grammage in g/m2, three numbers for the two liners and the medium, such as 150/120/150, and never in the US pound notation, but the caliper the tool uses is the same physical thickness whichever way the board is graded.

Clearance and fit

When you do not have inside dimensions yet, only the product, the Product plus clearance mode builds the inside for you. It takes the product length, width, and height and adds two clearances per axis, one for each side, so the inside on each axis is the product plus twice the per-side clearance. The clearance is the gap that lets the product go in and out without forcing, absorbs a little dimensional variation in the product and the board, and leaves room for any inner packaging. Too little and the box is a struggle to pack; too much and you are paying to ship air and losing stacking strength to a loose fit.

How much clearance to allow depends on the product and how it is handled. A rigid, regular item that drops straight in needs little, around 5 to 10 mm per side. Electronics and items with connectors or protruding parts want more, around 15 to 25 mm, to clear the parts and leave room for a bag or a foam end cap. Fragile goods that need a cushion around them want the most, around 25 to 40 mm per side, because the cushion itself takes up the gap. The third worked example below runs this path: a product of 280 x 180 x 130 mm with a 10 mm clearance per side becomes an inside of 300 x 200 x 150 mm, which is the same box as the metric example that starts from the inside.

Once the tool has the inside, whether you entered it directly or built it from the product, the rest of the chain is the same. It grows the inside to the outside by the flute caliper, lays out the blank, and reports the area and the yield. Starting from the product just adds the first step, so you can go straight from an item on your bench to the flat blank you need to order, without doing the clearance arithmetic by hand.

Board area, yield, and cost

The board area per box is the simplest cost signal: it is the flat blank length times the blank width, converted to square feet in imperial or square meters in metric. On the default the blank of 46.02 x 18.48 in is 5.905 ft2, and that number, times the board price, times one plus the waste percent, is the material cost in a single box. The waste percent covers the trim and the setup scrap the plant cannot avoid, and the default of 5% is a common allowance you can adjust to your own plant’s figure.

The area in one box is not the whole cost story, though, because board is bought and run as large master sheets, and how the blank tiles the sheet decides the real yield. The tool lays the blank onto the master sheet both ways, blank length along the sheet length or across it, and keeps the orientation that fits more blanks. It counts the whole blanks that fit, floor of the sheet length over the blank length times floor of the sheet width over the blank width, and reports the boxes per sheet and the trim waste, the fraction of the sheet that ends up as scrap. On the default, a 96 x 48 in master sheet yields 5 blanks at about 8% trim.

The yield is where small size changes pay off. A blank that is a little too long or too wide can drop a whole row or column off the sheet and jump the trim waste sharply, while a small trim to the box or a change of orientation can add a blank across the sheet and cut the waste. The second worked example shows this the other way: a metric blank that does not tile its sheet cleanly runs at 24% trim, three times the default. Check the boxes-per-sheet and the trim percent before you settle a size, because the difference between a box that tiles a sheet and one that does not can outweigh the difference in the box’s own area.

HSC and FOL variants

The tool handles the two closest relatives of the RSC, and they differ from it only in the flaps, which changes the blank width. The HSC, the half slotted case, has flaps on one end only, the other end left open, so it is a tray or a box that takes a separate telescoping lid. Because it has one set of flaps instead of two, its blank width is the box height plus half the box width, H + W/2, rather than the RSC’s H + W. That makes the HSC blank shorter across the flap direction and so lighter on board, at the cost of an open end that needs a lid or an insert.

The FOL, the full overlap, goes the other way. Its flaps are cut to the full box width rather than half, so the flaps on each face overlap completely across the top and the bottom instead of just meeting in the center. That double layer of board across the flap seam adds stacking strength and protects the contents where an RSC has only a butted seam, which is why the FOL is chosen for heavy or fragile loads. The cost is board: the FOL blank width is the box height plus two full box widths, H + 2W, so the sheet is much taller and uses far more board than an RSC of the same box. The fifth worked example shows a double-wall FOL running to a 66.62 x 41.12 in blank and 19.024 ft2, far more than the same box as an RSC would need.

Whichever style you pick, the blank length and the inside-to-outside conversion are the same; only the blank width formula changes with the flap style. So you can size a box as an RSC, see the blank and the area, then switch the style to FOL to see what full-overlap flaps cost in board, or to HSC to see what an open tray saves, all without re-entering the box. That side-by-side is the quickest way to decide whether the extra strength of a full overlap is worth the extra sheet, or whether a half slotted tray plus a lid is the cheaper build for your product.

Measuring a box correctly

Most box mistakes are measuring mistakes, so it is worth being precise about the convention. Dimensions are given in the order length by width by height. Length is the longer of the two dimensions of the open face, width is the shorter, and height is the distance between the two flap sets, the dimension perpendicular to the opening. Getting the order right matters because the blank length wraps the L and W panels while the blank width uses the H, so swapping width and height changes the whole layout, not just the labels.

The second rule is where to measure from. Inside dimensions are measured from the center of one score to the center of the next, not from board edge to board edge, because the panel folds along the score line and the working space is bounded by those fold lines. Since the board has real thickness, an inside measured to the board faces would come out a caliper short on each wall. This is also why the tool insists on the inside-to-outside conversion: the inside is the center-to-center clear space, and the outside adds the board thickness that sits outside those fold lines.

The third point is to be clear about which dimension set a supplier or a drawing is quoting. A box called out as 12 x 10 x 8 is almost always inside, because that is what the product needs, but a footprint on a pallet drawing is outside, and a sheet on a cutting order is the blank. When you read a spec, check which of the three it is, and let the tool convert to the other two. Enter the inside for fit, confirm the outside stacks and palletizes, and order the blank the plant runs, and the three stay consistent instead of drifting a caliper apart.

Standards and where the numbers come from

The blank geometry here follows the FEFCO and ESBO catalog, the international standard set of corrugated box designs, in which the regular slotted case is code 0201. That catalog defines how each style is scored, slotted, and jointed, so a 0201 built to it is the same box whether it is cut in one plant or another. In Brazil the same designs are adopted by the ABPO, and the RSC is the caixa maleta or caixa normal, measured inside in the order comprimento by largura by altura and specified by grammage in g/m2 rather than by the US pound notation.

The measuring convention, inside dimensions from center of score to center of score, is the standard corrugated practice that keeps the fit consistent across suppliers. The inside-to-outside caliper rule, one caliper on length and width and two on height, follows directly from how the flaps fold, and the flute calipers the tool presets, E through BC, are typical published values you can override with a measured board. The joint tab default of about 1.375 in, or 35 mm, is a common manufacturer’s joint width; the exact tab depends on the joint type, so treat it as a starting point and set your plant’s value.

The estimate is a design and quoting tool, not a substitute for a plant dieline. The blank size, the area, and the yield are exact for the formulas above, but the real cutting die may add bleed, adjust the slot width, or change the tab for a particular joint or a particular corrugator, and the true boxes-per-sheet depends on the plant’s trim rules and gripper margins. Use the tool to size the box, compare styles and flutes, and estimate the board and the yield, then confirm the final dieline and the sheet layout with your box plant before you commit a cutting order. For the stacking side of the same box, check the board on the Box Compression Strength Calculator, which reads the blank perimeter and the caliper this tool reports.

Five worked examples

Example 1: default single-wall RSC (the widget opens on this)

This is the case the tool opens on, a common single-wall shipping box, and it shows the whole conversion from inside to sheet. An inside of 12 x 10 x 8 in in C-flute at a 0.16 in caliper, with a 1.375 in joint tab and a 96 x 48 in master sheet, grows to an outside of 12.16 x 10.16 x 8.32 in. The flat blank is 46.02 x 18.48 in, the flap depth is 5.08 in, and the board area is 5.905 ft2. From the master sheet you get 5 blanks at about 8% trim. The lesson: the blank is one flat rectangle, its length wraps the perimeter plus the joint, 2 x (12.16 + 10.16) + 1.375 = 46.02 in, and its width is the height plus one full width for the flaps, 8.32 + 10.16 = 18.48 in.

Example 2: metric RSC

This case runs the same formula in millimeters and shows what happens when the blank does not tile the sheet cleanly. An inside of 300 x 200 x 150 mm in C-flute at a 4 mm caliper, with a 35 mm joint tab and a 2500 x 1600 mm master sheet, grows to an outside of 304 x 204 x 158 mm. The flat blank is 1051 x 362 mm, the flap depth is 102 mm, and the board area is 0.380 m2. From the master sheet you get 8 blanks at about 24% trim. The lesson: the geometry is identical in metric, but watch the trim, because this blank leaves 24% of the sheet as scrap, three times the default, so a small size or orientation change here would pay off in yield.

Example 3: product plus clearance

This case starts from the product instead of the inside, and it shows the tool building the inside for you. A product of 280 x 180 x 130 mm with a 10 mm clearance per side, in C-flute at a 4 mm caliper with a 35 mm joint tab, gives an inside of 300 x 200 x 150 mm, because each axis gains two clearances, one per side. That inside grows to an outside of 304 x 204 x 158 mm, the flat blank is 1051 x 362 mm, and the board area is 0.380 m2, the same box as the metric example. The lesson: enter the product and a per-side clearance and the tool builds the inside first, then the outside, then the blank, so you can go straight from an item on the bench to the sheet to order.

Example 4: small E-flute retail box

This case is a small retail box in a thin flute, and it shows how a small blank tiles a sheet far more efficiently. An inside of 8 x 6 x 4 in in E-flute at a 0.06 in caliper, with a 1.25 in joint tab and a 96 x 48 in master sheet, grows to an outside of 8.06 x 6.06 x 4.12 in. The flat blank is 29.49 x 10.18 in, the flap depth is 3.03 in, and the board area is 2.085 ft2. From the master sheet you get 12 blanks at about 22% trim. The lesson: a thin flute adds little to the box, only 0.06 in on length and width and 0.12 in on height, and the small blank fits many more times on the sheet than a shipping case does.

Example 5: heavy double-wall FOL

This case is a heavy box built as a full overlap in double-wall board, and it shows what full-overlap flaps cost in sheet. An inside of 18 x 14 x 12 in in BC-flute at a 0.28 in caliper, with a 1.5 in joint tab and full-overlap flaps, grows to an outside of 18.28 x 14.28 x 12.56 in. The flat blank is 66.62 x 41.12 in, the flap depth is 14.28 in, the full box width, and the board area is 19.024 ft2. The lesson: full-overlap flaps span the whole width rather than meeting in the center, so the blank width is H + 2W and the sheet is much taller, using far more board than an RSC of the same box would, which is the price of the extra strength and protection a FOL gives.

Three expert tips

Specify inside, cut outside, order the blank

The fit and the strength come from the inside dimensions, the product plus a clearance, but the plant does not cut inside dimensions, it cuts the flat blank. Keep the three sets straight and convert in order: inside for the fit, outside by the flute caliper for the stacking footprint, and the blank for the cutting order. On the default, an inside of 12 x 10 x 8 in is an outside of 12.16 x 10.16 x 8.32 in and a blank of 46.02 x 18.48 in, and each is used for a different job. Enter the inside so the box fits, confirm the outside palletizes, and order the blank the plant runs, and the box you order is the box that fits.

The flute sets both the thickness and the growth

A heavier flute does two things at once: it adds board thickness for stacking strength, and it grows every box dimension in the inside-to-outside conversion. Length and width each gain one caliper and the height gains two, so a box that just fits in E-flute at 0.06 in can end up meaningfully larger in C at 0.16 in or in a BC double wall at 0.28 in, and the blank and the sheet grow with it. Pick the flute for the stacking strength you need, which the Box Compression Strength Calculator sizes from the blank perimeter and the caliper, then re-check the fit and the blank at that flute, because the strength choice moves the box size.

Watch the sheet yield, not just the box

The board area times the price is the material in one box, but the boxes-up on the master sheet drives the real cost. A blank that does not tile the sheet cleanly can run at three times the trim of one that does, as the metric example’s 24% against the default’s 8% shows. A small change in the box size, or flipping the blank’s orientation on the sheet, can add a whole row or column across the corrugator and cut the trim sharply. Check the boxes-per-sheet and the trim percent before you commit a size, because a box that tiles the sheet can beat a smaller box that wastes it.

Limits of the method

This calculator gives a sound first pass at the box blank size and the board it needs, not a finished plant dieline. It converts between the inside, the outside, and the flat blank with the standard corrugated formulas, lays out the RSC, HSC, and FOL blanks, and estimates the board area, the cost, and the boxes-per-sheet yield, which is most of what you need to size a box, compare styles and flutes, and quote the board. It assumes a standard 0201 geometry with all flaps cut to the style’s depth, scores and slots at the panel boundaries, and a single glue tab, which is how the great majority of cases are built.

What it does not do is the detail a plant cutting die carries. The real die may add bleed, set a specific slot width, adjust the tab for the actual joint, glue, stitch, or tape, and the true boxes-per-sheet depends on the plant’s trim rules, gripper margins, and grain direction, where the blank width runs with the flute. The flute calipers are typical values and real board varies, so enter a measured caliper when you have one. Treat the blank size and the yield as accurate planning figures, and confirm the final dieline and the sheet layout with your box plant before a cutting order, and confirm the board carries the stack on the box compression tool before you settle the flute.

Common mistakes to avoid

The first mistake is ordering the inside dimensions as the blank, or the outside as the inside. The three sets differ by a caliper or by the whole flap and perimeter geometry, so mixing them makes a box a caliper too small on every wall or a sheet the wrong size. Enter the set you know and let the tool convert to the other two. The second is forgetting that the height gains two calipers, not one, in the inside-to-outside step, because the inner and outer flaps each add a thickness at the top and the bottom, so a height converted as if it gained one caliper comes out short.

A third mistake is measuring to the board edges instead of the center of the scores, which drops a caliper off each inside wall and gives a box that is tight on the product. A fourth is leaving the joint tab out of the blank length, or using the wrong tab for the joint, since the tab is added once after the four wall panels and a plant’s tab can run from about 1.25 to 1.5 in. A fifth is quoting the board on one box’s area and ignoring the sheet yield, when a blank that tiles poorly can waste a quarter of the sheet. Enter the right dimension set, convert the height by two calipers, measure to the scores, set the real joint tab, and check the trim, and the blank the tool gives will match the sheet the plant cuts.

Where this calculator fits

It suits anyone sizing a corrugated box or quoting the board without opening a full plant dieline. A packaging engineer designing a case can move between the inside, the outside, and the blank in one place, see how the flute grows the box and the sheet, and compare an RSC against an HSC tray or a FOL for the same product. A buyer or an estimator can turn a product and a clearance straight into a blank size, a board area, and a boxes-per-sheet yield, and price the board before a purchase order. A warehouse or operations planner can check what a box will cost in board and how it tiles a sheet before committing a size.

Because it separates the three dimension sets and draws the flat blank, it also builds intuition for where a box’s board goes. You can watch the height grow by two calipers, see a full-overlap flap double the sheet against an RSC, and compare how the same box tiles a master sheet in different flutes. The natural neighbor is the Box Compression Strength Calculator, because the blank perimeter and the caliper this tool reports are exactly what the McKee formula needs: size the box here, then check whether that board carries the stack there. The other close companion is the Cases Per Pallet Calculator, which takes the outside dimensions this tool settles and works out how the box fills a pallet. The Packaging Engineering hub gathers these tools together, and the Supply Chain hub carries the tools that turn a well-sized, well-stacked pallet into a trailer and container plan.

Frequently asked questions

Sources, disclaimer, and editorial transparency

The relationships used here follow standard corrugated packaging practice and the FEFCO and ESBO catalog, in which the regular slotted case is code 0201. The flat RSC blank length is 2 x (L + W) + joint tab and the blank width is H + W, with each flap folding at W/2; the HSC blank width is H + W/2 and the FOL blank width is H + 2W. Inside converts to outside by the flute caliper t, with outside L = inside L + t, outside W = inside W + t, and outside H = inside H + 2t. The board area per box is the blank length times the blank width, converted with in2 over 144 for ft2 and mm2 over 1e6 for m2; the cost per box is the area times the price times one plus the waste; and the boxes per master sheet is the better of the two orientations, floor(sheet L over blank L) times floor(sheet W over blank W), with the trim waste as one minus the used area over the sheet area. Flute calipers used are E 0.06 in (1.5 mm), B about 0.12 in (3 mm), C 0.16 in (4 mm), A 0.20 in (5 mm), and BC about 0.28 in (7 mm), and the joint tab defaults to about 1.375 in (35 mm), all editable. Dimensions are measured inside, center of score to center of score, in the order length by width by height. 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 estimates for design and quoting, not a substitute for a plant dieline or a packaging engineering review. The blank size, the area, and the yield are exact for the formulas above, but the real cutting die may add bleed, adjust the slot width, or change the tab for a particular joint, glue, stitch, or tape, and the true boxes-per-sheet depends on the plant’s trim rules, gripper margins, and grain direction, where the blank width runs with the flute. The flute calipers are typical values and real board varies, so enter a measured caliper when you have one. Confirm the final dieline and the sheet layout with your box plant before a cutting order, and confirm the board carries the stack on the box compression tool before you settle the flute. 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.