Concrete Mix Ratio Calculator
Enter your mix ratio (e.g. 1:2:4) and target volume to get the exact weight of cement, sand, and aggregate — plus bag count — with a standard 1.54 dry volume factor applied.
Use the Concrete Mix Ratio Calculator
Mix Parameters
Advanced options
Standard: 1.54 for concrete nominal mixes (accounts for voids and bulking).
Set your mix parameters and click Calculate.
Mix Summary
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Weight Proportion
Summary
This concrete mix ratio calculator finds the quantities of cement, sand, and coarse aggregate needed for any nominal or custom mix ratio at a target volume. Enter a standard mix like 1:2:4 (M15) or 1:1.5:3 (M20), choose your volume and unit system, and instantly see the weight of each ingredient with a standard 1.54 dry-volume factor applied. Results include cement bag count (50 kg bags), sand and aggregate weights in kg and tonnes. All calculations are done client-side in your browser.
How it works
- Select a standard mix grade (M10 through M25) or enter a custom cement:sand:aggregate ratio.
- Choose your target concrete volume and unit (cubic meters or cubic feet).
- Optionally adjust the dry volume factor (default 1.54) and cement density (default 1440 kg/m³).
- Click Calculate to see ingredient quantities broken down by weight and volume.
- Cement result includes bag count based on standard 50 kg bags.
- All results include a summary you can copy for ordering or job-site reference.
Use cases
- Estimating cement bags and aggregate for a foundation or column pour.
- Cross-checking a ready-mix order against a hand-mixed batch calculation.
- Comparing material costs between M15 (1:2:4) and M20 (1:1.5:3) mixes.
- Planning material quantities before a rural or off-grid construction project.
- Verifying a contractor's material estimate for footings or slab work.
- Teaching concrete proportioning in civil engineering coursework.
- Converting between cubic-meter and cubic-foot volume inputs on site.