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Dictionary of Units / Measurements

Spread Rate (by Volume)

The spread rate of a substance is a measure of how much of it there is covering a unit area. The 'how much' can be measured by volume or by mass. The S I compatible unit of spread rate by volume is cubic metres/square metre. However, this is a rather large unit for most purposes and so liters/square metre is often preferred. To change any of these other units of spread rate into their equivalent values in liters/square metre use the operation and conversion factor given. Those marked with # are exact. Other values are given to an appropriate degree of accuracy.

cubic feet/acre        divide by 142.913

cubic inches/sq.yard   divide by 51.024

cubic yards/sq.mile    divide by 3387.577

cubic metres/hectare   divide by 10 #

cubic metres/sq.km     divide by 1000 #

cubic metres/sq.metre  x 1000 #

fl. ounces(UK)/sq.yard divide by 29.428


litres/square metre    1


gallons(UK)/acre       divide by 890.184

gallons(US)/acre       divide by 1069.066

gallons(UK)/hectare    divide by 2199.692

gallons(US)/hectare    divide by 2641.721

inches of rainfall     x 25.4 #

litres/hectare         divide by 10 000 #

millilitres/sq.metre   divide by 1000 #

millimetres of rainfall        1

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