Concrete Calculator
Convert any slab, beam, column or footing into exact cement bags, sand, aggregate, water and steel for M5 to M30 nominal mixes — with wastage and live material cost. Built by Deepsa AI for EPC, real estate and infrastructure teams that reconcile BOQ against actual consumption.
Concrete inputs
Nominal mix 1 : 1.5 : 3 · w/c 0.5
Material requirement
- Wet volume of concrete
- 12.00 m³ (423.8 cft)
- Dry volume (×1.54 + wastage)
- 19.40 m³
- Cement required
- 101.6 bags · 5080 kg
- Sand (fine aggregate)
- 5.29 m³ (186.9 cft)
- Coarse aggregate
- 10.58 m³ (373.8 cft)
- Water (approx.)
- 2540 litres
- Steel estimate (Slab)
- 960 kg
- Material cost
- ₹68,119
How concrete quantities are calculated
Wet volume is length × width × thickness. Because dry cement, sand and aggregate contain voids that close on mixing and compaction, the wet volume is multiplied by 1.54 to get dry volume. That dry volume is divided in the nominal mix proportion of the selected grade; the cement share is converted to bags at a bulk density of 1,440 kg/m³ (50 kg per bag), and water is derived from the grade's water–cement ratio.
Nominal mix ratios (IS 456)
| Grade | Cement : Sand : Aggregate | Cement bags / m³ | Typical use |
|---|---|---|---|
| M5 | 1 : 5 : 10 | 2.77 | Levelling course, PCC bedding |
| M7.5 | 1 : 4 : 8 | 3.41 | Levelling course, PCC bedding |
| M10 | 1 : 3 : 6 | 4.44 | PCC, non-structural fills |
| M15 | 1 : 2 : 4 | 6.34 | Flooring, kerbs, light footings |
| M20 | 1 : 1.5 : 3 | 8.06 | Slabs, beams, residential RCC |
| M25 | 1 : 1 : 2 | 11.09 | Columns, commercial RCC |
| M30 | 1 : 0.75 : 1.5 | 13.65 | High-rise columns, industrial floors |
Where concrete leakage actually happens
- Ordered quantity is estimated per pour, but never reconciled back to the approved BOQ line item.
- Cement bags issued against verbal indents are recorded days later, if at all.
- Rework and rejected pours are absorbed as "site consumption" instead of a variance.
- Legacy ERP closes the month after the concrete has already cured.
Read the construction material management guide or see how the overlay works on industrial construction projects.