Gravel calculator
Enter a size and depth for a volume and a weight.
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How the numbers are worked out
A rectangle in feet and inches: cubic yards = length × width × depth in inches ÷ 324. If you already know the area, use square feet × depth in inches ÷ 324. Cubic feet = cubic yards × 27.
In metres and centimetres: cubic metres = length × width × depth in centimetres ÷ 100, or square metres × centimetres ÷ 100. One foot is 0.3048 metres and one inch is 2.54 centimetres.
Pounds = the exact cubic yards × the density in pounds per cubic yard. US short tons = pounds ÷ 2,000. Metric tonnes = pounds × 0.45359237 ÷ 1,000. The weight is not taken from a rounded volume. Figures are shown to two decimal places at the end. A real zero is 0.00. A positive amount that would show as 0.00 is shown as <0.01.
A pad 9 feet by 3 feet by 12 inches is 1 cubic yard (27 cubic feet). With pea gravel at 2,600 lb/yd³ that is 1.30 US short tons, or 1.18 metric tonnes. The tonne line is the same weight, not a second load.
Changing units keeps a finished measurement and shows it in the other system. An unfinished entry stays where you typed it. The previous result is cleared until you calculate again.