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
Nominal mix ratios like 1:1.5:3 work fine for small residential jobs, but any project requiring a documented, code-compliant mix design needs to actually run the IS 10262:2019 absolute-volume design procedure, a multi-step calculation that's tedious and error-prone to do by hand. This calculator walks through that full procedure: it derives target mean strength from your grade and an assumed standard deviation, caps the water-cement ratio at whichever is stricter between the strength-driven value and the IS 456:2000 durability limit for your exposure condition, pulls base water content from IS 10262 Table 4 and adjusts it for your slump and aggregate shape, floors cement content at the exposure's code-mandated minimum, and finally splits coarse and fine aggregate quantities using Table 5's volume fraction via the absolute volume method. Enter your grade, exposure condition, aggregate size, fine aggregate zone and target slump, and get a complete design-stage mix proportion with every governing check shown. This is a design-stage estimate only, IS 10262:2019 still requires the proportions to be verified with laboratory trial mixes using your actual site materials before use.
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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