Concrete Calculator
Calculate the volume of concrete needed for foundations, slabs, driveways, and other construction projects. Get accurate measurements in cubic metres or cubic yards.
Typical: 0.15m (6") for driveways, 0.1m (4") for paths
What is a Concrete Calculator?
A Concrete Calculator helps you determine the exact volume of concrete needed for your construction project. It calculates cubic metres or cubic yards based on the dimensions of your pour area, whether it's a rectangular slab, circular foundation, or any other shape.
This calculator is essential for DIY projects, professional builders, and contractors planning concrete work. It helps avoid ordering too much or too little concrete, saving time and money.
How to Use This Calculator
- Select the shape of your concrete area (rectangle, circle, or slab)
- Choose your preferred unit (metres or feet)
- Enter the dimensions:
- For rectangles/slabs: length and width
- For circles: radius
- For all shapes: depth/height
- Click "Calculate Concrete" to see the volume needed
- Review the results including bag quantities and cost estimate
Understanding Concrete Volume
Concrete volume is measured in cubic metres (m³) or cubic yards. Common thicknesses include:
- Driveways: 100-150mm (4-6 inches) thick
- Paths/Walkways: 75-100mm (3-4 inches) thick
- Foundations: 150-300mm (6-12 inches) thick
- Patios: 100-150mm (4-6 inches) thick
- Garage Floors: 100-150mm (4-6 inches) thick
Always add 5-10% extra to account for waste, spillage, and uneven ground.
Concrete Mix Options
You can order concrete in different ways:
- Ready-Mix Concrete: Delivered by truck, typically £100-£150 per cubic metre. Best for large projects.
- Bagged Concrete Mix: 20kg or 25kg bags from DIY stores. More expensive per cubic metre but convenient for small projects.
- Mix Your Own: Cement, sand, and aggregate. Most cost-effective but requires mixing equipment.
Example Calculations
Example 1: Driveway
A driveway 6m long × 3m wide × 0.15m deep = 2.7 m³ of concrete needed
Example 2: Patio
A patio 4m × 4m × 0.1m deep = 1.6 m³ of concrete needed
Example 3: Circular Foundation
A circular foundation with radius 1.5m and depth 0.3m = 2.12 m³ of concrete needed
Frequently Asked Questions
Related Calculators
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