Step 2
Once you have done this you need to work out the total area. This is done by using the following formula:
A (width) x B (length) = C (Total Area)
Step 3
Now you need to multiply C by the required depth of material.
C x required depth of material = TOTAL REQUIRED AMOUNT OF MATERIAL (in cubic metres)
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USEFUL CONVERSIONS FOR CALCULATING DEPTHS
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Inches
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Centimetres
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Metres
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1"
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2.5cm
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0.025 m
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2"
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5cm
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0.05 m
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2.5"
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6.25cm
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0.062 m
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3"
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7.5cm
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0.075 m
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Step 4
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If you are working with products that are sold by the cubic metre such as woodchip, compost or bark the figure you reached in Step 3 is the amount you actually need.
You should allow an extra 10% for compaction as most natural materials settle and condense.
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For other products you will need to convert cubic metres into tonnes. There are different methods for doing this according to which product it is:-
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For Soil
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Multiply C by 1.3
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For Sand
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Multiply C by 1.4
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For Decorative Aggregates
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Multiply C by 1.6
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Remember, there are:-
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1000 litres in a m³
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1000 kg in a tonne (equal to 40 x 25kg bags)
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THE ABOVE INFORMATION IS INTENDED AS A GUIDE ONLY, WE CANNOT BE HELD RESPONSIBLE FOR CALCULATIONS & APPLICATIONS BEYOND OUR CONTROL.