Cement, sand & gravel calculator
Indicative breakdown per m³ at reference dosage (300 kg cement/m³). Not a substitute for design dosage.
Purchase quantity
3.15 m³
Net measurement: 3 m³ · Waste 5 %
- Cement38 bag
- Sand1.89 m³
- Gravel2.205 m³
- Water (indicative)540 l
Ready-mix or bags? At this volume: ready-mix truck.
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Shopping list
What to buy for this calculation. Look up each material at your store.
- Cement · 38 bagSearch at Amazon
- Sand · 1.89 m³Search at Amazon
- Gravel · 2.205 m³Search at Amazon
How it's calculated (visible formula)
cement = V × kg/m³; aggregates = V × m³/m³; all × (1+waste)
- Net geometric measurement, no waste.
- Adjustable waste % for cuts and breakage.
- Purchase rounded up to sellable units (boxes, bags, buckets, boards).
Reference mix per m³ (adjust on site)
| Material | Per m³ |
|---|---|
| Cement | 300 kg (6 × 50 kg bags) |
| Sand | 0.6 m³ |
| Gravel | 0.7 m³ |
| Water | ≈180 l |
| 50 kg cement bag | ≈26 l of concrete |
Worked example: 3 m³
- Cement: 900 kg → 36 × 25 kg bags
- Sand: 1.8 m³; gravel: 2.1 m³
→ See breakdown with waste applied.
Common mistakes
- Taking the reference dosage as structural.
- Ordering aggregates with no bulking.
From calculation to quote
Add labour, overhead and your margin, and generate the professional PDF.
FAQs
- Valid for structural concrete?
- Not as final dosage: get it from the engineer or the plant.
- How many 50 kg bags per m³?
- About 39 bags net at reference dosage, plus waste. Design dosage comes from the engineer.
- Bags or bulk?
- Under ~1 m³ bags usually win; above that compare with ready-mix (see table).
Maintained by Srikanta M · Formula v1.0.0 · Verified 2026-09-10 · Updated 2026-09-10 · Limits: quantity estimation, not structural design or site supervision.