Free calculators · Metric · Australian sizes
See the job drawn to scale before you buy a thing.
Type in your sizes and watch the wall, deck or fence draw itself, with the number of bricks, boards or bags beside it. Every page shows its working.
Pick a calculatorCalculators
- Square metres m²Work out the area of a rectangle, triangle or circle in square metres, with an optional allowance for waste.
- Concrete slab m³Work out the cubic metres of concrete for a slab, path or shed base, and how many 20 kg bags that is.
- Post holes bagsWork out how much concrete fills your post holes, allowing for the space the post takes up.
- Bricks bricksWork out how many bricks a wall needs using the standard Australian brick and a 10 mm mortar joint, or your own brick size.
- Paint litresWork out how many litres of paint a room needs for the walls and the ceiling, from the room size, the number of coats and the coverage on the tin.
- Decking boardsWork out how many decking boards and lineal metres a deck needs, plus the number of joists and fixings.
- Paling fence palingsWork out how many posts, rails and palings a timber paling fence needs from its length and your spacings.
- Tiles tilesWork out how many tiles and boxes you need for a floor or wall from the area, the tile size and the grout joint.
- Pavers paversWork out how many pavers a path, patio or driveway needs, and the bedding sand to go under them.
- Mulch, soil and gravel m³Work out the cubic metres of mulch, soil, sand or gravel to cover an area to a set depth, in bags or tonnes as well.
Why these are different
- You see the job, not just a numberThe drawing is to scale and redraws as you type, so a wrong measurement looks wrong straight away.
- The working is on the pageEach calculator explains its sum, so you can check it or do it by hand.
- Your numbers, not oursAnything that changes by brand, like bag yield or paint coverage, is a box you can edit.
- Nothing to sign up forNo account and no email. Copy the result or send someone a link to the same sum.
In the trade?
Put these calculators on your own website, with your name on them and your prices in them.