Ready-Mix Concrete Calculator

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Calculate how much Ready-Mix Concrete you will need

Length:

metres

Width:

metres

Depth:

millimetres

Concrete required:

How Our Calculator Works

  • Enter your measurements

    Input the length, width, and depth of the area you need to pour concrete into.
  • Instant Concrete Volume Calculation

    Once you enter all dimensions, the calculator instantly provides the required concrete volume in cubic meters (m³), ensuring accuracy for your project.
  • Avoid over or under ordering

    The result helps ensure you order the right amount of concrete, reducing waste and preventing costly shortages.
  • Works for any project

    Suitable for concrete slabs, foundations, driveways, and patios, making it easy for both builders and DIYers to get accurate estimates.
  • Account for wastage

    It's wise to add 5–10% onto the required amount to avoid shortages, as it's always worth accounting for spillages and uneven surfaces.

Ready-Mix Concrete Prices per m³ (UK 2025)

Concrete Strength Estimated Price per m³
C20 / GEN3 £95 – £115
C25 £100 – £120
C30 £110 – £130
C35 / Commercial £115 – £140
Specialist mixes £130+ (varies by additives)

✔ Step-by-Step: Manually Calculate Concrete Volume

  1. 1

    Convert Depth to Meters

    If your depth is measured in millimetres (mm), convert it to metres (m) before calculating. Just divide by 1,000. For example, 100mm = 0.1m.

  2. 2

    Multiply Length × Width × Depth

    Use metres for all dimensions. Multiply length × width × depth to get your volume in cubic meters (m³). Example: 3m × 5m × 0.1m = 1.5m³ of concrete needed.

  3. 3

    Add 5–10% Extra for Wastage

    Always allow for a margin of error. Add 5–10% on top of your calculated volume to account for spillage, uneven surfaces, or overfill. For 1.5m³, ordering 1.6–1.65m³ ensures you're covered.

What is the standard depth for driveways, patios, and foundations?
Patios & pathways → 75mm - 100mm
Driveways → 100mm - 150mm
Shed bases → 100mm
House foundations → 150mm - 300mm
How do I calculate how much ready-mix concrete I need?
Multiply length × width × depth (in meters). Example: 3m × 10m × 0.1m = 3.00m³ of concrete. Our calculator does this instantly to prevent miscalculation.
How much extra concrete should I order to account for waste?
Add 5–10% to cover spillage, uneven ground, and overfill. For 3.00m³, order 3.15–3.30m³ to stay safe and avoid running out mid-pour.
What factors affect the cost of ready-mix concrete?
Pricing depends on mix type (C20/C25), delivery distance, additives, batch size, and access. Smaller loads or long-distance deliveries often cost more.

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