Construction · 14 calculators

Construction Calculators

Q: Should I add extra for waste?

Yes — we suggest ordering a little more than the bare quantity to cover cuts, breakage, and mistakes (often 5–10%). Each tool notes a sensible allowance where it applies.

Q: Do you store the numbers I enter?

No. Every calculation runs entirely in your browser — the figures you type are never sent to or stored on a server.

Estimate materials and quantities for any project — concrete, paint, tile, gravel, roofing, and more — so you order the right amount the first time.

Jump to Materials Areas & surfaces Structural & other

Materials

Concrete Calculator

Cubic yards or metres of concrete needed.

Gravel Calculator

Tonnes of gravel for a given area and depth.

Sand Calculator

Volume and weight of sand required.

Mulch Calculator

Bags or cubic yards of mulch for a bed.

Asphalt Calculator

Tonnes of asphalt for a paved area.

Areas & surfaces

Square Footage

Floor or wall area from dimensions.

Tile Calculator

Number of tiles for a surface.

Paint Calculator

Litres or gallons to cover your walls.

Flooring Calculator

Boxes of flooring for a room.

Roofing Calculator

Squares of material for a roof.

Structural & other

Stair Calculator

Rise, run, and number of steps.

Lumber Calculator

Board feet and cost of timber.

Brick Calculator

Bricks needed for a wall.

BTU Calculator

Heating or cooling capacity for a room.

About our construction calculators

Buying too little means a second trip; too much means wasted money. These calculators turn your measurements into accurate material quantities, with sensible allowances for the way real projects work.

Every tool here is free, works instantly in your browser, and never stores the numbers you enter. They give reliable results for everyday use — treat anything high-stakes as a starting point and double-check with a professional.

Frequently asked questions

Are these construction calculators free?+

Yes. Every construction calculator on OnlineCalculators.com is completely free, with no sign-up, account, or app required.

Should I add extra for waste?+

Do you store the numbers I enter?+