MOT Type 1 Calculator – Estimate Your Sub-Base in Tonnes

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MOT Type 1 Calculator

How to Use the MOT Type 1 Calculator

  • ✔ Measure your area

    If you don’t already know the total area in square metres, just enter the length and width of your space in metres — the calculator will work it out for you.
  • ✔ Enter your required depth

    Add the depth of MOT Type 1 you plan to lay, in millimetres. Common depths are 75mm for patios or 150mm for driveways and shed bases.
  • ✔ Hit "Calculate" to see how much you need

    The tool will instantly estimate how many tonnes of MOT Type 1 you’ll need, based on a density of 2.4 tonnes per cubic metre — ideal for bulk bag or loose-load planning.
🔹 What is MOT Type 1?
MOT Type 1 is a sub-base material made from crushed stone, usually limestone or granite. It’s graded from 40mm down to dust and compacts into a solid, load-bearing layer for concrete, paving or tarmac.
🔹 How deep should MOT Type 1 be?
It depends on the project. Patios usually need 75–100mm, while driveways or shed bases need 100–150mm or more. Always compact it in layers no deeper than 75mm each.
🔹 How much does MOT Type 1 weigh per m³?
MOT Type 1 weighs around 2.4 tonnes per cubic metre when compacted. Our calculator uses this figure to help estimate how many tonnes you’ll need for your project.

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