Sheet Material Cut List Calculator

A cut list calculator works out how many stock sheets (plywood, MDF, chipboard, etc.) you need to cut a given list of smaller parts from, and which parts should come from which sheet, so you can buy the right amount of material and cut it efficiently instead of guessing.

It uses a shelf-packing method: your parts are sorted tallest-first, then placed into horizontal rows ("shelves") across the sheet width, starting a new shelf when a part doesn't fit the current row and a new sheet when a shelf doesn't fit the remaining sheet height. This is the same principle a person marking out a sheet by hand would use.

Full nesting software solves a genuinely hard optimisation problem to find the mathematically smallest number of sheets, often by rotating and interlocking irregular shapes. That kind of layout frequently can't be cut with straight, full-length saw cuts — it needs a CNC router or panel saw with plunge capability. This calculator trades a small amount of theoretical efficiency for a plan you can actually cut with an ordinary table saw or circular saw.

Kerf is the width of material the saw blade removes as it cuts — typically 2-3.2mm for a circular or table saw. Every cut you make loses a kerf's worth of material, so ignoring it causes parts to come out slightly undersized once you've made several cuts across a sheet. This calculator adds your kerf value between every part on the same row and between rows.

Thin-kerf blades (around 2-2.4mm) waste less material and need less power to drive, which suits smaller or cordless saws. Full-kerf blades (around 3-3.2mm) are typically more rigid and preferred for larger stationary table saws where cut quality and blade life matter more than material savings. Enter your actual blade's kerf for the most accurate cutting list.

2440 x 1220mm (8x4ft) is the standard UK sheet size, widely available and easiest to transport in a normal car or van. 3050 x 1220mm and 2440 x 1830mm oversized sheets can reduce the number of sheets needed for larger parts or higher quantities, but cost more per sheet and are harder to transport and handle alone. Use the Sheet Size Comparison table to see the sheets-needed trade-off for your specific parts list.

It's the percentage of the total sheet area actually used by your parts, versus the area you pay for. A lower percentage means more waste (offcuts) relative to what you bought. Utilisation naturally varies with how well your part sizes fit together — a few large parts that don't divide evenly into a sheet will always waste more than parts sized to nest neatly.

It's based on the exact geometry of the shelf-packing plan this calculator generates, so it accurately reflects that specific plan — but a different packing arrangement (including a true nesting optimiser, or your own manual marking-out) could achieve a different utilisation for the same parts list.

Yes — tick "Allow Rotation" and a part that doesn't fit the sheet width in its entered orientation will be automatically rotated 90° if that lets it fit. This is applied to make a part fit the sheet at all; it isn't used to further optimise the overall waste percentage.

A part is excluded if it's too large to fit the sheet's width in either orientation (its smaller dimension is still bigger than the sheet width), or if it only fits when rotated and Allow Rotation is switched off. Check the Assessment panel for which part and why, then either increase the sheet size, reduce that part's dimensions, or enable rotation.

Up to 6 different part sizes, each with its own quantity, for up to 300 total individual pieces in one calculation. This covers the vast majority of DIY and small workshop projects; for a much larger job, split it into multiple calculator runs by part group.

No — the packing treats every part as freely rotatable (when enabled) and doesn't track grain direction, veneer face, or which side should be visible. For veneered plywood or projects where grain direction matters, treat the sheet count and utilisation as a starting estimate and mark out the actual layout by hand, keeping grain direction consistent.

As a general rule, cut your largest parts first while the sheet is still a full, easy-to-handle size, then work down to smaller parts — this matches the tallest-first order this calculator uses to build the cutting list. Always cut the parts on Sheet 1 before moving to Sheet 2 so your running offcuts stay organised.

Yes — the calculation only needs a sheet width, height and your part sizes, so it works equally well for chipboard, OSB, plasterboard, hardboard, acrylic or any other flat sheet material. Just set the Custom sheet size if your stock isn't one of the standard plywood/MDF presets.

Group similar-sized parts together into a single row with a combined quantity where the exact size doesn't matter (for example, several shelf sizes that are all close enough to round up to one row), or run the calculator more than once for different groups of parts and add the sheet counts together — buying the higher total to be safe.