Concrete mix ratio calculator.
Split a concrete volume into cement, sand and aggregate quantities. Enter the total volume and mix ratio for each pour or batch, & this concrete mix ratio calculator will find each material's quantity, plus the number of 50 kg cement bags to order. Nominal mixes proportion cement, sand and aggregate by volume, a simplified, long-standing alternative to a full designed mix for lower-strength or non-structural concrete. This calculator isn't a substitute for a designed mix on structural work. Use our Concrete Volume Calculator first if you need the total volume from pour dimensions.
Drop an Excel or CSV file or to replace the table below.
Column A: pour or batch name. Column B: total concrete volume needed. Column C (optional): nominal mix ratio — 1:3:6, 1:2:4, 1:1.5:3 or 1:1:2; rows without a recognised value default to 1:2:4.
Parsed entirely in your browser — your file is never uploaded to our servers.
| Pour / batch | Concrete volume needed (m³) | Nominal mix ratio | Cement (m³) | Sand (m³) | Aggregate (m³) | Row actions |
|---|---|---|---|---|---|---|
| — | — | — | ||||
| — | — | — | ||||
| — | — | — |
How we calculate this.
Split a concrete volume into cement, sand and aggregate quantities. Enter the total volume and mix ratio for each pour or batch, & this concrete mix ratio calculator will find each material's quantity, plus the number of 50 kg cement bags to order. Nominal mixes proportion cement, sand and aggregate by volume, a simplified, long-standing alternative to a full designed mix for lower-strength or non-structural concrete. This calculator isn't a substitute for a designed mix on structural work. Use our Concrete Volume Calculator first if you need the total volume from pour dimensions.
For each row: the mix ratio parts are summed (e.g. 1:2:4 sums to 7), and the total volume is split proportionally — cement volume = total volume × (1 ÷ parts sum), and similarly for sand and aggregate using their own ratio part. Cement bags needed is cement volume × 1,440 kg/m³ ÷ 50 kg, rounded up to a whole bag.
| Assumption | Value | Source |
|---|---|---|
| Nominal mix ratios | 1:3:6 / 1:2:4 / 1:1.5:3 / 1:1:2 cement:sand:aggregate, by volume | Simplified, long-standing alternative to a full designed mix for lower-strength or non-structural concrete, published in IS 456 and equivalent regional guidance. Not a claim of compliance with any specific strength grade or code — confirm against a design mix for structural work. |
| Cement bag conversion | 1 × 50 kg bag ≈ 0.035 m³ | Based on a typical loose cement bulk density of ~1,440 kg/m³ — standard construction-materials reference figure. |
This is an early-appraisal planning estimate, not a quotation or a substitute for a surveyed takeoff. Last reviewed 5 Aug 2026.
A simplified way of proportioning cement, sand and aggregate by volume (e.g. 1:2:4), rather than a lab-designed mix tailored to a specific strength. It's a long-standing convention for lower-strength or non-structural concrete.
A leaner mix (1:3:6) suits blinding and non-structural fill; 1:2:4 is a common general default; richer mixes (1:1.5:3, 1:1:2) suit higher-strength requirements. Always confirm against your project specification for structural work.
It's based on a typical loose bulk density for bagged cement — real density varies slightly by product and how settled the bag is, so treat it as an ordering estimate and round up.
No. Nominal mixes are an early-estimate simplification. Structural concrete should use a properly designed and tested mix specified by a qualified engineer.
Yes — click or drop an Excel (.xlsx/.xls) or CSV file onto the upload area. The first column should be an item name and the second the measurement for that row; extra columns this calculator uses are read too if present. The file is parsed entirely in your browser — it's never uploaded to our servers. Download the blank template first if you're not sure of the layout.
Yes — use the metric/imperial switch above the calculator. Values you've already entered convert automatically; nothing is lost switching back and forth.
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