How do I minimise waste when cutting sheet goods?

Plan your cuts carefully by laying out all parts on the sheet first. Cut the largest pieces first, then use offcuts for smaller parts. Allow for the saw kerf (typically 3mm) between each cut. This calculator helps determine the optimal number of parts per sheet.

What is the standard plywood sheet size in the UK?

The standard UK plywood sheet is 2440 x 1220mm (8 x 4 feet). You can also buy 2440 x 610mm half sheets, 3050 x 1525mm (10 x 5) for larger projects, and metric 2500 x 1250mm sheets. Most timber merchants will cut sheets to size for a small fee.

How much waste should I expect from sheet goods?

With careful planning, aim for less than 15-20% waste. Simple rectangular parts can achieve less than 10% waste. Complex or mixed-size parts may produce 25-30% waste. Keeping offcuts for small parts and jigs helps reduce overall waste.

Should I account for saw kerf in my layout?

Yes, always add the saw kerf width (typically 3mm for a standard circular saw blade, 2mm for a fine blade) to each part dimension when planning layouts. Forgetting kerf can result in parts that are too small after cutting.

WoodCalcs

Board Layout Calculator — Optimise Sheet Cutting

Optimise part placement on sheet goods to minimise waste and cost.

Sheet Size

Select the sheet size for your calculation

Part Length

Longest dimension of the area

Part Width

Shortest dimension of the area

Number of Parts Needed

Saw Kerf

Price per Sheet (optional)

Enter your supplier price for a cost estimate

How We Calculate This

This calculator determines how many identical parts can be cut from a standard sheet, accounting for saw kerf.

Layout method

Parts per sheet = (Sheet length / (Part length + Kerf)) x (Sheet width / (Part width + Kerf))

The calculator tries both orientations (0 degrees and 90 degrees) and uses the better result. Waste percentage = (Total sheet area - Used part area) / Total sheet area x 100.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify measurements and material quantities before cutting or purchasing.