Calculate cement, sand, aggregate & water quantities per IS 10262:2019 & IS 456:2000 | M15 to M40 grade
Quick concrete mix ratios as per IS 456:2000 Table 9. Best for small works, footings, slabs up to M25.
Detailed mix design as per IS 10262:2019. For structural concrete, RCC works, bridges and all M25+ grades.
Find how many bags of cement are needed for any volume, or reverse-calculate volume from bags.
This free online concrete mix design calculator helps civil engineers, site supervisors, contractors and students calculate the exact quantities of cement, sand (fine aggregate), coarse aggregate, and water required for any grade of concrete — from M15 to M50 — as per IS 10262:2019 and IS 456:2000.
Concrete mix design is the process of determining the right proportions of cement, water, fine aggregate (sand) and coarse aggregate to achieve the desired workability, strength, and durability. In India, all RCC structures must follow IS 10262:2019 for design mix and IS 456:2000 for nominal mix guidelines.
Nominal Mix (IS 456:2000): Uses fixed volumetric ratios like 1:2:4 (M15) or 1:1.5:3 (M20). Suitable for small, non-structural work. Easy to implement at site without lab testing.
Design Mix (IS 10262:2019): Scientifically determined proportions based on water-cement ratio, target mean strength, aggregate grading and exposure conditions. Mandatory for M25 and above structural concrete.
| Grade | Ratio (C:S:CA) | Max W/C | Min Cement (kg/m³) | Use Case |
|---|---|---|---|---|
| M15 | 1:2:4 | 0.60 | 250 | PCC, levelling courses |
| M20 | 1:1.5:3 | 0.55 | 300 | Slabs, beams, columns |
| M25 | 1:1:2 | 0.50 | 320 | Bridges, water tanks |
| M30 | Design Mix | 0.45 | 340 | High-rise columns |
| M40 | Design Mix | 0.40 | 380 | Prestressed, flyovers |
The water-cement ratio (W/C) is the single most important factor controlling concrete strength. As per Abrams' law, lower W/C = higher strength. IS 456:2000 specifies maximum W/C ratios based on exposure conditions — 0.60 for mild to 0.40 for extreme exposure.