Material Calculators

Quick quantities by trade. Save the page to PDF below.

Common jobs

Worked answers for specific room and slab sizes, using the same figures as the calculator above.

Timber span lookup

Indicative — not for construction. These are ballpark single-span figures for estimating member counts only. Final sizing must come from the current AS1684 span table supplement or a structural engineer, for your timber grade, load, wind and spacing.

MemberGradeSize (mm)Spacing (mm)

Official free sources:WoodSolutions, and your timber supplier's AS1684 span table supplement.

About this tool

Material Calculators works out practical quantities by trade — paint coverage, tile counts, plasterboard sheets, concrete and footing volumes, timber board feet and roofing quantities — each with a sensible waste allowance built in. Pick a trade tab and the figures update as you type.

How to use it

Choose a trade tab, e.g. Paint, Tiles or Concrete.
Enter your dimensions or area — figures update live.
Check the waste allowance applied and adjust it if your job needs more.
Print the page to PDF to keep a copy of the quantities.

FAQ

Is this free?

Yes — every trade calculator here is free and unlimited.

Are the waste allowances accurate for my job?

They're sensible defaults for estimating, not a substitute for a site measure-up on a complex job — adjust them if your wastage runs higher.

Does anything leave my browser?

No — all figures are calculated locally and nothing is uploaded.

Can I save or print the results?

Yes — use your browser's print function to save a PDF copy.

Estimates only — allow for laps, cuts and site conditions. ← all tools