Pro tips:
Dry factor = 1.33× wet volume
Cement density ≈ 1440 kg/m³
Sand density default: 1600 kg/m³
Default wastage: 10%
Inputs
Results
All results include wastage and dry-factor where applicable.
| Metric | Value | Notes |
|---|---|---|
| Wall area | – | Computed from inputs |
| Wall volume | – | Area × thickness |
| Number of bricks | – | Based on module size |
| Mortar wet volume | – | Wall vol − brick vol |
| Mortar dry volume | – | Wet × dry factor |
| Cement volume | – | By mix ratio |
| Cement mass | – | ρ ≈ 1440 kg/m³ |
| Cement bags | – | Bag weight setting |
| Sand volume | – | By mix ratio |
| Sand mass | – | Using bulk density |
| Water | – | w/c × cement mass |
Example data table
| Example | Area | Thickness | Brick (L×W×H) | Joint | Mix | Wastage |
|---|---|---|---|---|---|---|
| A | 5.0 m² | 100 mm | 190×90×90 mm | 10 mm | 1:5 | 10% |
| B | 12.0 m² | 200 mm | 215×102.5×65 mm | 10 mm | 1:6 | 8% |
| C | 18.6 m² | 100 mm | 230×110×76 mm | 12 mm | 1:4 | 12% |
Use “Load example” to prefill inputs similar to Example A.
Formulas used
- Area A = L × H (if area not provided).
- Wall volume Vw = A × t.
- Module size: Lm = Lb + J; Hm = Hb + J.
- Brick count N = A ÷ (Lm × Hm).
- Brick volume Vb = N × (Lb × Wb × Hb).
- Mortar wet Vm,wet = Vw − Vb (≥ 0).
- Wastage: Vm,wet,adj = Vm,wet × (1 + wastage%).
- Dry volume Vm,dry = Vm,wet,adj × dry factor.
- Mix parts (1:n): total = 1 + n.
- Cement vol Vc = Vm,dry × (1 / total); Sand vol Vs = Vm,dry × (n / total).
- Cement mass mc = ρc × Vc, ρc ≈ 1440 kg/m³; bags = mc ÷ bag weight.
- Sand mass ms = ρs × Vs.
- Water W = w/c × mc (litres ≈ kilograms).
Assumptions: standard stretcher bond; joints uniform; densities typical. Adjust inputs to match your materials.
How to use this calculator
- Select your unit system and enter wall area or dimensions.
- Set thickness, brick size, joint thickness, and wastage.
- Choose mix ratio, bag weight, densities, and optional water–cement ratio.
- Click Calculate to generate mortar, cement, sand, and water requirements.
- Use CSV or PDF to export results and attach to estimates.
- Tweak inputs until outputs align with specifications and site conditions.
FAQs
A common allowance is 1.33 to convert wet mortar to dry volume. It accounts for bulking, voids, and wastage of constituents.
It uses module dimensions including joints, which gives realistic counts for stretcher bond. Site variations and breakages still apply, so include a practical allowance.
General brickwork often uses 1:5 to 1:6. Use richer mixes (e.g., 1:3) for higher strength or exposure; follow local codes and manufacturer data.
Set a w/c ratio (e.g., 0.45–0.6). Water mass ≈ w/c × cement mass. One litre of water approximately equals one kilogram.
Yes. Toggle the unit system. The calculator converts to metric internally and displays consistent results.
This can occur with unrealistic geometry. Increase joint thickness or review brick dimensions and wall thickness. The calculator floors negative volumes to zero.