Concrete Mix Ratio Calculator (Cement, Sand, Aggregate)
Cement bags, sand and aggregate for any nominal mix (1:2:4, 1:1.5:3 …).
M20 (1:1.5:3) takes ~8 bags/m³. The 1.54 factor converts finished concrete back to loose dry ingredients — forget it and you'll be 35% short on site.
Formula
Concrete Mix Ratio Calculator (Cement, Sand, Aggregate) is a free concrete mix ratio for civil engineers, contractors and quantity surveyors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Concrete Mix Ratio Calculator (Cement, Sand, Aggregate)
Cement bags, sand and aggregate for any nominal mix (1:2:4, 1:1.5:3 …). The calculation implements dry volume = 1.54×wet; split by parts; cement: 1,440 kg/m³, 50 kg/bag (IS 456 nominal mixes; CPWD analysis). M20 (1:1.5:3) takes ~8 bags/m³. The 1.54 factor converts finished concrete back to loose dry ingredients — forget it and you'll be 35% short on site.
How to use Concrete Mix Ratio Calculator (Cement, Sand, Aggregate)
- 1Enter Wet concrete volume in m³.
- 2Enter Cement parts.
- 3Enter Sand parts.
- 4Enter Aggregate parts (M20 = 1:1.5:3 · M15 = 1:2:4 · M10 = 1:3:6).
- 5Read Cement bags (50 kg), Sand, Aggregate instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Concrete Mix Ratio Calculator (Cement, Sand, Aggregate)?
- ✓Implements the standard formula — dry volume = 1.54×wet; split by parts; cement: 1,440 kg/m³, 50 kg/bag
- ✓Reference cited on-page: IS 456 nominal mixes; CPWD analysis
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Concrete Mix Ratio Calculator (Cement, Sand, Aggregate) use?+
It computes dry volume = 1.54×wet; split by parts; cement: 1,440 kg/m³, 50 kg/bag, per IS 456 nominal mixes; CPWD analysis. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
M20 (1:1.5:3) takes ~8 bags/m³. The 1.54 factor converts finished concrete back to loose dry ingredients — forget it and you'll be 35% short on site.
Does it include wastage?+
Yes — standard wastage/bulking factors are built in and stated in the formula line, so the quantity is an orderable number, not a bare geometric volume.
Is the Concrete Mix Ratio Calculator (Cement, Sand, Aggregate) free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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