How many 50kg cement bags you need per cubic metre of concrete — by mix strength.
Getting the cement quantity right controls both strength and cost. Here are the typical bag counts per cubic metre for common concrete strengths in South Africa.
| Mix | Ratio (cement:sand:stone) | Cement per m³ |
|---|---|---|
| Low strength (10 MPa) | 1:4:4 | ~5–6 bags/m³ |
| Medium (25 MPa) | 1:2:3 | ~7 bags/m³ |
| High (30 MPa) | 1:1.5:3 | ~7.5–8 bags/m³ |
Why builders choose us
- ~7 bags for a 25 MPa mix
- Ratio drives strength
- Add ~10% for waste
- Order sand & stone to match
Related pages
Frequently asked questions
How many bags of cement in 1m³ of concrete?
About 7 x 50kg bags for a standard 25 MPa mix; roughly 5–6 for weak mixes and up to 8 for 30 MPa.
What mix is 25 MPa concrete?
Approximately 1 part cement : 2 parts sand : 3 parts stone by volume.