Calculate the exact quantities of cement, sand, aggregate, and water needed for your concrete mix based on volume and concrete grade (M10-M30).
M20 (1:1.5:3) - Standard grade for reinforced concrete (RCC)
Compressive Strength: 20 MPa
Water-Cement Ratio: 0.5
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Need to know exactly how much cement, sand, and aggregate to buy for your concrete project? Our cement calculator takes the guesswork out of concrete mixing by calculating precise material quantities based on your project volume and selected concrete grade. Get accurate bag counts and weight estimates for any construction project.
A cement calculator determines the exact quantities of cement, sand (fine aggregate), coarse aggregate (gravel/stone), and water needed for concrete mixing. It uses standardized mix ratios based on concrete grades (M10 to M30) and accounts for the 54% volume increase (bulkage) when dry materials are mixed. The calculator converts wet volume to dry volume, then applies the mix ratio to determine each material's quantity in bags, kilograms, or cubic meters.
Cement Calculation Formula
Cement = (Wet Volume × 1.54 ÷ Ratio Sum) × Cement RatioUses standard concrete grades (M10-M30) with precise cement:sand:aggregate ratios for reliable results.
Get cement quantities in 25kg, 40kg, or 50kg bags to match what's available at your local supplier.
Account for spillage and losses with adjustable waste factor (0-25%) for realistic ordering.
Automatically applies the 1.54× dry volume factor that accounts for air gaps between particles.
Calculates water requirements based on grade-specific water-cement ratios for optimal mix consistency.
Get estimated material costs to help with project budgeting and supplier ordering.
Calculate cement bags needed for small residential concrete slabs and pathways.
Determine material quantities for strip or pad foundations with proper M25 grade concrete.
Plan cement, sand, and gravel for heavy-duty M20 driveway concrete that handles vehicle loads.
Calculate high-strength M25-M30 concrete requirements for structural reinforced elements.
Quickly calculate small quantities needed for setting multiple fence posts in concrete.
Plan materials for pool construction using M30 grade concrete for water resistance.
Budget for construction projects by calculating total material costs before purchasing.
Verify contractor material estimates and ensure you're not being overcharged for supplies.
The 'M' stands for Mix, and the number indicates compressive strength in MPa (megapascals) after 28 days of curing. M20 means 20 MPa strength, M25 means 25 MPa. Higher grades have more cement and less aggregate, resulting in stronger but more expensive concrete. M20 (1:1.5:3 ratio) is standard for residential construction, while M25-M30 is used for structural elements.