Concrete Calculator
Calculate concrete volume needed for slabs, columns, and footings.
About Concrete Calculator
The Concrete Calculator on ToolsOfIndia is a free browser-based tool built for builders, contractors and DIY builders. Estimates are framed the way Indian contractors and material suppliers actually quote, so you can compare numbers directly with the local rate card. Compute the concrete volume needed for a slab, footing, column or beam by entering the dimensions, and the tool also gives the cement, sand and aggregate for a nominal mix like M20. The standard M20 mix of 1 part cement, 1.5 sand and 3 aggregate needs about 8 bags of 50 kg cement per cubic metre, and the tool shows the material breakdown so a supplier order is complete. Indian sites order cement in bags and aggregate in cubic metres or brass, and the tool handles the unit switch. Because it is a pure local calc, nothing is uploaded. It is the concrete estimate that an under-order or over-order always costs. In practice people reach for it most when estimating concrete for a slab, when ordering cement sand and aggregate for a footing, or while checking the M20 mix quantities. Everything is free with no usage caps, and nothing asks for your email address.
How to Use the Concrete Calculator
- Open the Concrete Calculator tool above — it loads instantly in your browser.
- Enter your values in the input fields provided.
- The result updates immediately — no calculate button needed (or click Calculate where shown).
- Copy or use your result directly. Nothing is stored or sent to any server.
Key Features of Concrete Calculator
- Slab/column/footing
- Volume calculation
- Multiple units
- Slab, footing, column, beam modes
- M20 nominal mix quantities
- Bags and cubic-metre output
Related Searches for Concrete Calculator
concrete calculator • concrete volume • ready mix • concrete mix • cement calculator • construction concrete • slab concrete • concrete volume calculator • m20 mix ratio • cement sand aggregate calculator • concrete calculator india • cement bags calculator — all available free on ToolsOfIndia.com.
Frequently Asked Questions
How to calculate concrete for a slab?
Concrete volume = Length (m) × Width (m) × Thickness (m). For a 10x10 ft slab, 4 inches thick: (3.05 × 3.05 × 0.1) = 0.93 cubic meters of concrete needed.
What is the concrete mix ratio?
Common mix ratios: M15 (1:2:4) for general purposes, M20 (1:1.5:3) for reinforced concrete, M25 (1:1:2) for high-strength. Ratios are cement:sand:aggregate.
How much does concrete weigh?
Normal concrete weighs approximately 2,400 kg per cubic meter (150 lbs per cubic foot). Lightweight concrete is 1,600-2,000 kg/m³, while high-density concrete can be 3,000+ kg/m³.
How many cement bags in a cubic metre of M20?
About 8 bags of 50 kg per cubic metre for an M20 nominal mix, which the tool computes from the mix ratio.
What is the M20 mix ratio?
1 part cement, 1.5 parts sand and 3 parts aggregate by volume, the standard nominal mix the tool uses.