Help The EngineerConcrete Mix Design Report • IS 10262:2019
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IS 10262 : 2019 • IS 456 : 2000
Concrete Mix Design Calculator
Enter your grade, exposure and material test results. Get cement, sand, aggregate and water per m³, field-corrected, with all IS checks.
M20 – M40Field correctionsStep-by-stepFree
1
Design requirements
Grade, exposure and workability💡 The strength you need. Slabs, beams and columns in houses usually use M20 or M25.
💡 Where will the concrete be? Not sure? See the "Exposure guide" in the cheat sheet below. Inside a building = Mild; outdoors with rain = Moderate.
💡 The largest stone size. 20 mm is used for most RCC work.
💡 How runny the concrete is. Slabs and beams: 50–100 mm. Pumped concrete: 75–100 mm or more.
💡 Crushed machine stone (gitti) = Angular. River pebbles = Rounded.
💡 Choose Yes if the concrete will be placed with a concrete pump.
2
Cement & water-cement ratio
Read w/c from IS 10262 Fig. 1 for your cement💡 Written on the cement bag (OPC 43, OPC 53 or PPC).
💡 Use 3.15 for OPC and 2.90 for PPC if you have no test value.
💡 Less water = stronger concrete. A typical starting value fills in when you change the grade. It must not be more than the IS 456 limit (checked on the right).
💡 A chemical (plasticizer) that makes concrete flow with less water. Choose Yes if you add one.
3
Aggregate test results
From your lab tests (IS 2386, IS 383)💡 From the lab test. Typical sand: 2.60 – 2.70.
💡 From the lab test. Typical stone: 2.60 – 2.80.
💡 From the sand sieve test. Most river sand is Zone II; finer sand is Zone III.
💡 Usual split for 20 mm: 60% of 20 mm and 40% of 10 mm.
💡 How much water dry sand soaks up. Typical 1 – 2%. Use 0 if not known.
💡 How much water dry stone soaks up. Typical 0.5 – 1%. Use 0 if not known.
💡 Extra water on wet sand at site. Dry sand = 0; damp sand 2 – 5%.
💡 Extra water on wet stone. Usually 0 – 1%.
📋 Cheat sheet: exposure, slump and typical values
Exposure guide (IS 456 Table 3)
| Mild | Inside buildings, protected from rain (not near the sea). |
| Moderate | Outdoors with rain, buried in normal soil, always under water. |
| Severe | Alternate wetting and drying, heavy rain, coastal areas. |
| Very severe | Sea-water spray, corrosive fumes, aggressive soil. |
| Extreme | Tidal zone, direct contact with aggressive chemicals. |
Slump guide (IS 456 cl. 7.1)
| 25 – 75 mm | PCC, footings, lightly reinforced slabs and beams. |
| 50 – 100 mm | Heavily reinforced slabs, beams, columns, walls. |
| 75 – 100 mm | Pumped concrete. |
| 100 – 150 mm | Tremie (under-water) concrete, very congested steel. |
Typical values (if not tested)
| Sp. gravity: OPC / PPC | 3.15 / 2.90 |
| Sp. gravity: sand | 2.60 – 2.70 |
| Sp. gravity: stone | 2.60 – 2.80 |
| Water absorption: sand / stone | 1 – 2% / 0.5 – 1% |
| Surface moisture: damp sand | 2 – 5% |
| Plasticizer / superplasticizer | 5–10% / 15–25% water cut |
Good to know
- Lower w/c = stronger, more durable concrete.
- Cement should stay below 450 kg/m³; use a plasticizer for high slump.
- 1 bag of cement = 50 kg.
- For M25 and above, IS 456 recommends a design mix (not 1:1:2).
- Always make trial cubes and test at 7 and 28 days.
Full calculation, step by step (IS 10262)
Important: This calculator gives a trial mix as per IS 10262:2019. Always confirm it with trial batches and 7/28-day cube tests before use on site. Specific gravities, absorption and moisture must come from your own material tests.
MIX PROPORTION BY WEIGHT (C : FA : CA)
1 : 1.70 : 2.22
CementSandStoneWater
Quantity of concrete m³ field-corrected
Design inputs
IS code checks
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