How to Calculate Concrete Mix
What is Concrete Mix?
Concrete Mix Calculator helps contractors and tradespeople accurately size, spec, and estimate materials and systems.
Formula
Mix Ratio 1:2:3 = 1 part cement : 2 parts sand : 3 parts aggregate
Step-by-Step Guide
- 1Calculate total volume needed, apply 1.54 factor for wet-to-dry, split by ratio
- 2Apply the formula using your project measurements
- 3Add required safety factors or waste allowances per code
Worked Examples
Input
1 cy concrete, 1:2:3 mix
Result
Cement: 6.2 bags, Sand: 0.44 cy, Aggregate: 0.66 cy
Common Mistakes to Avoid
- ✕Not applying code-required safety factors or derating
- ✕Forgetting to account for waste and cut losses in material estimates
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