Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Nominal volumetric mix estimate, not a concrete mix design or strength specification. Moisture and aggregate voids affect yields.
Example Calculation
- Finished wet volume: 1 m³
- Dry-volume multiplier: 1.5
- Cement volume parts: 1
- Sand volume parts: 2
- Aggregate volume parts: 3
- Loose cement bulk density: 1440 kg/m³
- Bag mass: 50 kg
Finished wet volume = 1 m³; Dry-volume multiplier = 1.5; Cement volume parts = 1; Sand volume parts = 2; Aggregate volume parts = 3; Loose cement bulk density = 1440 kg/m³; Bag mass = 50 kg. Primary result: 360.
Frequently asked questions
How do I use this calculator?
Enter finished wet volume, dry-volume multiplier, cement volume parts, sand volume parts, aggregate volume parts, loose cement bulk density, bag mass. The result updates automatically. Use Reset to restore the example values.
What method does it use?
cement mass=wet volume ×dry multiplier ×cement parts/sum(parts) ×bulk density.. Nominal volumetric mix estimate, not a concrete mix design or strength specification. Moisture and aggregate voids affect yields.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.