Buy the right amount, the first time
Free calculators for tiling, flooring, painting, concrete and building work. Every formula is written down, tested and explained, and everything runs in your browser.
- Tested formulas
Every calculator is checked against hand-worked examples before it goes live.
- Metric and imperial
Switch units at any time. Nothing you typed is lost.
- Private
No sign-up, no tracking. Your numbers never leave your device.
All calculators
Floors & tiling
Tiles and boxes for a floor or wall, with waste for your layout.
Grout weight from tile size, thickness and joint width.
Tile adhesive or thinset by trowel notch size.
Packs of laminate, vinyl or wood flooring, plus underlay.
Length and pieces of baseboard or skirting board.
See tile size, colour, grout and pattern in 3D; count whole and cut tiles.
Walls & paint
Concrete & outdoor
Volume and bags for a slab, footing, column or post holes.
Volume, tonnes and bags of gravel, sand, topsoil or mulch.
Deck boards, joists and screws for a rectangular deck.
Posts, panels, rails, pickets and post concrete.
Building & measuring
See your tiles before you buy them
Pick a tile size, colour, grout and pattern, see it in a 3D room at true scale, and count whole and cut tiles for your own floor.