MOT Type 1 Calculator

Calculate how much MOT Type 1 sub-base aggregate you need in tonnes and cubic metres.

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How to Use This Calculator

How to Use

  1. Enter the length and width of the area you are sub-basing.
  2. Enter the compacted depth – typically 100 mm (4 in) for paths and 150–200 mm (6–8 in) for driveways.
  3. Add a compaction allowance (10–20%) because MOT Type 1 settles when whacked down.

Tips

  • MOT Type 1 weighs about 2.1 tonnes per cubic metre once compacted.
  • Bulk bags hold roughly 850 kg – just under a tonne.
  • Lay and compact in 75–100 mm layers for the best result.

Common Questions

How much does MOT Type 1 weigh?

Compacted MOT Type 1 weighs around 2.1 tonnes per cubic metre. One bulk bag holds roughly 850 kg.

How deep should MOT Type 1 be for a driveway?

For a domestic driveway, lay 150–200 mm (6–8 in) of compacted MOT Type 1. Paths and patios usually need 100 mm (4 in).

Why add a compaction allowance?

Loose MOT Type 1 reduces in volume when compacted, so adding 10–20% ensures you order enough to reach your finished depth.

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