Home + garden material calculators
Measure once. Buy right.
Turn room sizes into a useful shopping estimate. Clear formulas, metric and imperial units, no account required.
- Metric + imperial
- Open formulas
- Instant results
Available now / 06
Paint & primer calculator
Measure walls and ceiling, subtract doors and windows, then add coats and waste. The result rounds up to full containers.
Open calculatorTile & waste calculator
Calculate surface area, extra waste, individual tiles and full boxes. Metric and imperial dimensions stay physically equivalent.
Calculate tilesWallpaper roll calculator
Estimate strips and full rolls using room perimeter, roll size, trimming, pattern repeat and a waste allowance.
Calculate wallpaperFlooring & underlay calculator
Turn a room into packs of laminate or vinyl, rolls of underlay and lengths of skirting. Waste follows the laying pattern, not the room size.
Calculate flooringSoil & grass seed calculator
Beds and lawns are sold by volume and by sowing rate, not by area. Get bags, cubic metres and seed weight from one measurement.
Calculate soilConcrete volume calculator
Slabs, strip footings and columns, in cubic metres or cubic yards, with the bag count and the point where ready-mix takes over.
Calculate concreteRead before you buy
One measurement system
The room model comes first.
BuildSums stores the room once. Future calculators can reuse the same surfaces and openings for tile, flooring, wallpaper and trim.
- 01
Measure
Enter the real room and its openings.
- 02
Adjust
Set coverage, coats, container size and waste.
- 03
Buy
Use the rounded shopping quantity, then check the product label.