Construction Material Calculator
How many bricks, bags of cement and cubic feet of sand your wall, slab or plaster needs.
At a glance
- Brick wall: number of bricks, cement bags and sand for a 9-inch or 4.5-inch wall, minus doors and windows, in 1:4, 1:5 or 1:6 mortar.
- Concrete: cement, sand, aggregate (gitti) and water for slabs, beams, columns and footings in M10, M15, M20 or M25 nominal mix.
- Plaster: cement and sand for 12, 15 or 20 mm plaster on any area.
- Uses the standard site factors: dry volume = wet × 1.33 (brick mortar), × 1.54 (concrete), and plaster + 20% for joints then × 1.27; cement at 1,440 kg/m³ in 50 kg bags.
- Sizes in feet or metres; sand and aggregate in cubic feet, m³ and brass.
- Add your local prices for an estimate of the material cost.
Step by step
How to calculate construction materials
- 1
Choose the work
A brick wall, concrete (slab, beam, column, footing) or plaster.
- 2
Enter the sizes
Length, height or width, and thickness — in feet or metres. Deduct doors and windows from walls.
- 3
Pick the mix
Mortar ratio for brickwork and plaster, or the concrete grade.
- 4
Read the quantities
Bricks, cement bags, sand and aggregate, and the cost at your rates.
Features
Everything you need, nothing you don’t
Bricks and mortar
9-inch and 4.5-inch walls.
Concrete mixes
M10 to M25, any shape.
Plaster
12, 15 or 20 mm.
Feet or metres
cft, m³ and brass.
Standard factors
The ones engineers use.
Material cost
At your local rates.
Quick reference (per cubic metre)
Plaster, 12 mm thick in 1:6 over 100 m² (about 1,076 sq ft), needs about 7.5 bags of cement and 1.57 m³ (55 cft) of sand. Figures exclude wastage.
| Work | Cement | Sand | Aggregate |
|---|---|---|---|
| Brickwork, modular bricks, 1:6 | 1.26 bags + about 500 bricks | 0.26 m³ (9.3 cft) | — |
| M15 concrete (1:2:4) | 6.3 bags | 0.44 m³ (15.5 cft) | 0.88 m³ (31.1 cft) |
| M20 concrete (1:1.5:3) | 8.1 bags | 0.42 m³ (14.8 cft) | 0.84 m³ (29.7 cft) |
| M25 concrete (1:1:2) | 11.1 bags | 0.39 m³ (13.6 cft) | 0.77 m³ (27.2 cft) |
How it’s worked out
Wet concrete is measured after compaction, but cement, sand and aggregate are bought loose, with air between the grains — so the dry volume is about 54% more (× 1.54). The dry volume is split by the mix: for M20 (1 : 1.5 : 3, 5.5 parts), cement is 1.54 ÷ 5.5 = 0.28 m³ per m³ of concrete, which is 0.28 × 1,440 ÷ 50 ≈ 8 bags. Brick mortar uses × 1.33 because the mortar only fills the joints.
FAQ
Frequently asked questions
How many bricks are in 1 m³ of brickwork?
How many cement bags for 1 m³ of M20 concrete?
What is a brass?
Which mortar ratio should I use?
Does it include steel?
Why does my contractor’s figure differ?
Keep going
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