Concrete & masonry
Mortar Calculator
Your measurements : volume, dry-volume factor, cement ratio. Your estimate : cement, bags to buy, sand.
How the calculation works
Mortar Calculator
Cement = Volume × Dry-volume factor × Cement ratio ÷ (Cement ratio + Sand ratio) × Loose cement densityBefore you order
- Use the coverage, yield and dimensions printed on your product. Waste allowance is adjustable; real cuts and site conditions may change the order.
- Volume proportions and dry-volume factor are configurable planning assumptions. They do not specify concrete strength. Follow a tested mix or supplier instructions for the intended use.
- Planning estimate only. This is not a structural design, a safety approval or a local code check.
Worked example
- Volume
- 0.1 m³
- Dry-volume factor
- 1.33 ×
- Cement ratio
- 1 ×
- Sand ratio
- 4 ×
- Loose cement density
- 1,440 kg/m3
- Weight per bag
- 25 kg
Cement 38.3 kg
Bags to buy 2