How the Concrete Slab Calculator works
Wet volume = Length × Width × Thickness. Dry volume = Wet × 1.54. Cement, sand and aggregate are split by the mix ratio; cement bags = cement volume × 1440 kg/m³ ÷ 50 kg.
How to use this calculator
- Sign up free and verify your email to unlock the calculator.
- Choose Metric (m, mm, m³, kg) or Imperial (ft, in, cft, lb) units.
- Enter the length, width, thickness, mix, cement, sand 1 (e.g. coarse / lawrencepur), sand 2 (e.g. fine / ravi), crush 1 (e.g. 3/4"), crush 2 (e.g. 3/8").
- Results update instantly — read the quantities in the Results panel.
- Add a wastage allowance and confirm against your drawings and specifications before ordering.
Typical uses
Estimating RCC roof slabs, floor slabs and ground slabs before ordering cement, sand and crush.
Assumptions & limitations
Results are planning estimates based on standard assumptions for concrete & masonry work. They do not replace structural design, site measurement or project specifications. Material densities, wastage and mix proportions vary by region and supplier.
Frequently asked questions
- How does the Concrete Slab Calculator work?
- Wet volume = Length × Width × Thickness. Dry volume = Wet × 1.54. Cement, sand and aggregate are split by the mix ratio; cement bags = cement volume × 1440 kg/m³ ÷ 50 kg.
- Can I use the Concrete Slab Calculator in feet and inches?
- Yes. Switch to Imperial and enter feet, inches, square feet or pounds — the calculator converts automatically and shows results in imperial units.
- When should I use the Concrete Slab Calculator?
- Estimating RCC roof slabs, floor slabs and ground slabs before ordering cement, sand and crush.
- Is this construction calculator free?
- Yes. All CM PRO construction calculators are free — you only need to sign up and verify your email.
Related searches: concrete slab calculator, slab concrete volume, cement bags for slab, RCC slab quantity, M15 M20 concrete mix.
