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Building materials calculator

Quick quantities for a concrete pour or a brick wall. Everything is calculated in your browser, and the assumptions are listed under each calculator so you can check them.

Concrete

Cement, sand, aggregate and water for a nominal-mix pour.

Wet volume of concrete (m³)

Mix

M10 · 1:3:6Lean concrete, levelling course

M15 · 1:2:4Plain concrete, footings

M20 · 1:1.5:3Reinforced concrete

CustomEnter your own ratio

Water–cement ratio

Assumptions

Dry volume = 1.54 × wet volume, split by the mix ratio.
Cement density 1440 kg/m³, 50 kg bags.
Water = water–cement ratio × mass of cement.
No allowance for wastage. Nominal mixes only; use a mix design for important work.

Brickwork

Bricks, cement and sand for a wall of standard 240 × 115 × 57 mm bricks.

Wall

230 mmOne brick, load-bearing

115 mmHalf brick, partition

Length (m)

Height (m)

Mortar (cement : sand)

Doors and windows

Assumptions

Brick 240 × 115 × 57 mm with 10 mm joints, so each brick takes 250 × 125 × 67 mm of wall.
Wet mortar = wall volume − volume of the bricks themselves.
Dry mortar = 1.33 × wet mortar, split by the mortar ratio.
Cement density 1440 kg/m³, 50 kg bags. Openings are deducted in full.