MOT type 1 sub base calculator
Work out how much MOT type 1 sub base you need for a driveway, patio or path. Enter the area and depth.
Work out your sub base
Enter the area and the compacted depth you are laying.
MOT type 1 needed
Otis prices bulk bags or a loose load and can add delivery to the order.
Uses a density of about 2.0 tonnes a cubic metre for MOT type 1, with a small allowance for compaction. An estimate, always confirm with your merchant.
How the numbers work
The calculator multiplies the area by the compacted depth to get the volume, then converts that to tonnes using the density of MOT type 1. A little extra is sensible because the material compacts as it is rolled.
A common depth is 100mm for paths and patios and 150mm or more for driveways that take vehicles. Check your build up requirements.
This is what Otis does, instantly
A calculator works out quantities. Otis takes a customer question, works out the materials, checks live stock and pricing in the merchant’s own system, builds the quote and takes the order, day or night.
Common questions
How much MOT type 1 do I need?
Multiply the area by the depth to get the volume, then by about 2.0 to get tonnes. A 40 square metre drive at 150mm needs roughly 12 tonnes.
What depth of sub base for a driveway?
Commonly 150mm compacted for a domestic driveway, more for heavier use. Paths and patios often use 100mm.
How many tonnes in a bulk bag?
About 0.85 tonnes, since a bulk bag holds roughly 850kg. The tool shows the bag count.
Should I order extra?
Yes, a little spare helps with levelling and compaction. Loose materials also settle once rolled.
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