How many cubic feet are in a cubic yard?

Exactly 27. A yard is three feet, and volume scales with the cube, so 3³ = 27. This is the conversion behind almost every concrete and aggregate order.

Is a US gallon the same as a UK gallon?

No, and the gap is large. A US liquid gallon is 231 cubic inches, about 3.785 litres. An imperial gallon is about 4.546 litres — roughly 20% more. This converter uses US gallons.

How do I convert a volume to a weight?

Multiply by the density of the material. Water is 1 kg per litre, concrete around 2.4 kg per litre, gravel about 1.5. Volume alone tells you nothing about weight.

Conversions

Volume Converter

Enter a volume in any unit to see it in all the others at once.

Worked example

One cubic yard of concrete

1 yd = 3 ft, so 1 yd³ = 27 ft³
1 yd³ = 0.9144³ = 0.7646 m³
That is 764.6 litres

Where this goes wrong

Cubing when you should have converted, or the reverse

A cubic yard is 27 cubic feet because three feet cubed is 27, not 3. The same trap as area, one power worse: get it wrong on a concrete order and you are out by a factor of nine. Every factor on this page is derived by cubing the linear one, never typed by hand.

Questions

How many cubic feet are in a cubic yard?: Exactly 27. A yard is three feet, and volume scales with the cube, so 3³ = 27. This is the conversion behind almost every concrete and aggregate order.
Is a US gallon the same as a UK gallon?: No, and the gap is large. A US liquid gallon is 231 cubic inches, about 3.785 litres. An imperial gallon is about 4.546 litres — roughly 20% more. This converter uses US gallons.
How do I convert a volume to a weight?: Multiply by the density of the material. Water is 1 kg per litre, concrete around 2.4 kg per litre, gravel about 1.5. Volume alone tells you nothing about weight.