Concrete Mix Design Calculator (IS 10262)
Design a concrete mix proportion (cement, water, sand, aggregate) per IS 10262:2019.
Assumptions used in this calculation
- Standard deviation (Table 1): Uses IS 10262:2019 Table 1 assumed standard deviation for 'good' site quality control by grade band, not your site's actual measured deviation.IS 10262:2019
- Water content (Table 4): Base water content is the Table 4 reference value for 50mm slump and angular aggregate, adjusted for your slump, aggregate shape and admixture use.IS 10262:2019
- Coarse aggregate volume (Table 5): Uses the Table 5 volume fraction for your aggregate size and fine aggregate zone at w/c = 0.5, adjusted ±0.01 per 0.05 deviation in your actual w/c ratio.IS 10262:2019
- Durability limits (IS 456 Table 5): Minimum cement content and maximum free water-cement ratio are taken from IS 456:2000 Table 5 for reinforced concrete with OPC.IS 456:2000
- Not a substitute for lab trial mixes: This is a design-stage estimate only. IS 10262:2019 requires trial mixes with your actual materials before the proportions are used in construction.
About this calculator
The concrete mix design calculator runs the IS 10262:2019 absolute-volume design procedure: target mean strength from the grade and standard deviation, water-cement ratio capped by the IS 456:2000 durability limit for your exposure condition, water content from Table 4 adjusted for slump and aggregate shape, cement content floored by the exposure's minimum, and coarse/fine aggregate quantities via Table 5's volume fraction and the absolute volume method.
Worked example
M25, moderate exposure, 20mm aggregate, Zone II, 75mm slump
Result: Mix ratio ≈ 1 : 1.5 : 3, w/c ≈ 0.48, cement ≈ 388 kg/m³
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