CalcMass Concrete Calculator
Last updated: 2026-08-24
Mass Concrete Calculator — Calculate cement, sand and gravel for mass concrete.
Inputs
Result
Enter values and press Calculate
Was this helpful?
How to use it
- Multiply 5m × 3m = 15m² surface area
- Multiply 15m² × 0.20m = 3m³ concrete volume
- Calculate materials: 3m³ × 7 bags/m³ = 21 bags of cement
- Calculate sand: 3m³ × 0.65 = 1.95m³ of sand
- Calculate gravel: 3m³ × 0.90 = 2.70m³ of gravel
Common mistakes
- ⚠️ Using insufficient thickness (less than 15cm) which can cause cracking under load
- ⚠️ Not accounting for 5-10% waste from spills and leveling
- ⚠️ Confusing cubic meters with square meters when ordering concrete
Worked example
Calculate concrete needed for a foundation slab 5m long by 3m wide with 20cm thickness.
The calculated volume of {volumen} m³ requires {cement_sacos} bags of cement, {sand_m3} m³ of sand and {gravel_m3} m³ of gravel for a standard strength mix.
Input guide
| Field | Typical range |
|---|---|
| ancho | Typical range: 2–5 m for residential slabs |
| largo | Typical range: 3–10 m for residential slabs |
| espesor | Minimum 0.15 m for light loads, 0.20–0.30 m for standard loads |