Measure it. Plan it. Buy the right amount.
Home & DIY material calculators
Work out exactly how much material your home project needs. Every calculator shows the measured quantity, the waste allowance it added, the whole boxes, bags or bundles to buy, what those cover, what is left over, and the cost once you enter a price.
From a tape measure to a shopping list
12 ft × 15 ft
Measure
Enter feet and inches the way you actually measured them.
198 ft²
Plan
Add the waste allowance that suits your material and layout.
9 boxes
Buy
See whole boxes, bags or bundles, not an awkward decimal.
≈ $405
Budget
Add your local price for an estimate you can trust.
Popular calculators
Browse all calculatorsSquare Footage Calculator
Work out the area of a room, wall, yard or awkward shape in square feet or square metres. Add several sections, deduct openings, and carry the total into any material calculator.
Flooring Calculator
Turn a room area into whole boxes of laminate, vinyl or wood. Enter the coverage printed on your box, add a waste allowance for cuts, and see exactly what is left over.
Tile Calculator
How many tiles and how many boxes a floor or wall needs, with the grout joint added to both dimensions so each tile really covers slightly more than its nominal size.
Paint Calculator
How much paint a room needs with doors and windows deducted and coats accounted for. Enter the coverage from your own tin and get the number of cans to buy.
Concrete Calculator
Volume of concrete for a slab, footing, column or post hole, in cubic yards or cubic metres, with an overage allowance and the ready-mix quantity to order.
Fence Calculator
Posts, panels, pickets and rails for a fence run. Counts posts as sections plus one, shares a post at each corner, and takes gate openings out of the fenced length.
Start from what you are building
Pick the job and we will take you to the right calculator, then to whatever you need next.
Measurement
Measure a room, a wall, a yard or an odd-shaped space.Painting & Walls
Repaint a room, board out a wall, finish a ceiling.Flooring & Tile
Lay laminate, tile a bathroom, re-floor a kitchen.Concrete & Masonry
Pour a slab, set posts, cast a footing.Landscaping & Garden
Top up beds, lay a gravel path, build a patio.Fencing & Decking
Put up a fence, board a deck surface.Roofing & Exterior
Work out a pitch, estimate a re-roof.
Built to be checked, not just believed
The maths is on the page
Every result can be expanded into the actual steps that produced it, generated from the same code that calculates it.
Assumptions are labelled
Waste allowances, coverage figures and densities are shown as assumptions you can change, never as facts.
Units never lose your project
Switch between feet and metres at any point. The measurements you entered are converted, not discarded.
Free, and no account
Every calculator works without signing up, and your saved projects stay in your own browser.