How Do I Work Out How Much Gravel I Need For An Area?

May 4, 2017


One of the questions we often get asked as a merchant is: How do I know how much aggregate I’m going to need for this job? There are two ways of going about this.

OPTION 1 (the hard way): calculate it yourself according to a given formula.

On a driveway, for example,  the gravel, stone chips or shingle should be a minimum of 4″ (100mm) deep. If stones are larger, say 40mm or more, you’ll need to have it deeper still. Then use this rough guide (courtesy of http://www.doityourself.com):

For stones 1/4″ to 1/2″ : 50 sq. ft. per ton

For stones 1/2″ to 1″ : 45 sq. ft. per ton

For stones 1 1/2″ to 2″ : 40 sq. ft. per ton

Then you have to measure the area and multiply the length x width x depth in feet. Turn that into cubic yards by dividing the total by 27. One cubic yard of gravel is equal to 1.13 tons. Multiply total cubic yards by 1.13 to convert to tons.
Gravel Path
Head aching yet? If so, there’s a much easier way!
OPTION 2 (the easy way): use an online aggregate calculator.
There are plenty out there, but this one, from AWBS Ltd, has the advantage that you can calculate in metric or imperial.
Just enter the measurements of the area needing aggregate, and the calculator will tell you how many tonnes (or 25kg bags) you will need.

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