Cement Calculator
Professional cement calculator for accurate estimation of cement, sand, and aggregate quantities for concrete and mortar projects
Cement Calculator
Mix Type
Volume Parameters
Concrete Mix Ratio
Ratio of cement to sand to gravel with estimated compressive strength
Cement Properties
Select mix type and enter parameters, then click Calculate
Understanding Cement Calculations
Cement is the binding material in concrete and mortar. Accurate cement calculation ensures structural integrity, prevents material waste, and optimizes project costs. This calculator helps you determine the exact amount of cement needed based on your project requirements.
The calculation accounts for the dry-to-wet volume ratio, which represents how dry materials expand when mixed with water. Different mixtures have different ratios:
- • Concrete: 1.54:1 (dry materials increase by 54% when wet)
- • Mortar: 1.22:1 (dry materials increase by 22% when wet)
- • Cement & Water: 1:1 (no volume change)
How to Calculate Cement Quantity?
Calculating cement quantity involves several steps to ensure accuracy and account for material properties.
Calculation Steps
Example: 1 m³ wet volume × 1.54 = 1.54 m³ dry volume
Example: 1.54 m³ dry volume × (1 + 10/100) = 1.694 m³
Example: For 1:1.5:3 mix, Cement = 1.694 × (1/5.5) = 0.308 m³
Example: 0.308 m³ × 1440 kg/m³ = 443.5 kg ≈ 9 bags (50kg each)
Common Mix Ratios
Concrete Mix Ratios
Mortar Mix Ratios
Practical Calculation Example
Let's calculate cement requirements for a concrete slab project.
Example: Concrete Slab Foundation
- Mix Type: Concrete
- Wet Volume: 10 cubic meters (m³)
- Dry-to-Wet Ratio: 1.54:1
- Waste Factor: 10%
- Mix Ratio: 1:1.5:3 (20.0 MPa)
- Cement Density: 1440 kg/m³
- Bag Size: 50 kg
Step-by-Step Calculation
- • Cement: 3.08 m³ (4435 kg, 89 bags)
- • Sand: 4.62 m³
- • Gravel: 9.24 m³
Why Use Our Cement Calculator?
Calculator Features
Multiple Units
Calculate with cubic meters, feet, yards, liters, gallons, and more volume units.
Standard Mix Ratios
Pre-configured ratios for various strength grades and applications.
Instant Results
Real-time calculations with automatic updates as you adjust parameters.
Cement Calculator FAQ
For standard 1:1.5:3 concrete mix (20 MPa), you need approximately 6.3 bags of 50kg cement per cubic meter. The exact number depends on the mix ratio and waste factor. Higher strength mixes require more cement.
Wet volume is the final volume after mixing all materials with water. Dry volume is larger because dry materials have air gaps between particles that get filled when water is added. For concrete, dry volume is typically 1.54 times the wet volume.
Waste factor accounts for material spillage, uneven surfaces, over-excavation, and mixing losses. A 10% waste factor is standard for most projects. This ensures you have enough materials to complete the project without shortages.
Mix ratios depend on strength requirements: 1:5:10 for low-strength (5 MPa), 1:1.5:3 for standard strength (20 MPa), and 1:1:2 for high-strength (25 MPa). Consult structural plans or engineers for specific requirements.
Yes! Select 'Mortar' as the mix type and choose appropriate ratios: 1:6 for interior plaster, 1:5 for brickwork, 1:4 for exterior plaster, or 1:3 for rich mortar mix. The calculator automatically adjusts for mortar's different dry-to-wet ratio (1.22:1).
Calculate Cement for Your Project
Get accurate cement, sand, and aggregate calculations for your concrete or mortar project. Ensure proper mix ratios and avoid material shortages or excess.