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Metric Imperial Unit Conversions

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Metric Imperial Unit Conversions

Help plan a cycle trip, pack a parcel and scale a recipe. Use the conversion facts below. Show your working and round only when asked.

Conversion facts

Use these approximate conversions. For reverse conversions, divide by the same factor.

Length: 1 inch = 2.54 cm

Length: 1 mile = 1.609 km

Mass: 1 pound = 0.454 kg

Capacity: 1 UK pint = 0.568 litres

Capacity: 1 UK gallon = 4.546 litres

Height: 1 foot = 12 inches

Quick conversions

Calculate carefully. Include the unit in each answer.

1.A cycle computer records a ride of 8 miles. Convert this distance to kilometres. Give your answer to 2 decimal places.

2.A parcel has a mass of 2.5 kg. Convert its mass to pounds. Give your answer to 1 decimal place.

3.A recipe needs 3 UK pints of milk. How many litres is this? Give your answer to 2 decimal places.

4.Which is longer: a 15 cm ribbon or a 6-inch ribbon? Convert the inches to centimetres before deciding.

The 15 cm ribbon
The 6-inch ribbon
They are exactly the same length

5.A bottle holds 750 ml, which is 0.75 litres. Convert 0.75 litres to UK pints. Give your answer to 2 decimal places.

Plan and solve

Use the facts above to help with each real-life challenge.

6.A walking route is 5 km long. Convert this distance to miles. Give your answer to 2 decimal places.

7.A parcel weighs 3 pounds. Convert its mass to kilograms. Give your answer to 3 decimal places.

8.A car has 45 litres of fuel. A sign gives fuel quantity in UK gallons. How many gallons is 45 litres? Give your answer to 2 decimal places.

9.A cyclist is 5 feet 8 inches tall. Convert this height to centimetres. First find the total number of inches, then convert.

10.A market stall sells apples for £2.50 per pound. A customer buys 2 kg of apples. Convert 2 kg to pounds, then calculate the cost. Give the cost to the nearest penny.

11.A jug contains 2 UK pints of water. Is this more or less than 1 litre? Show a calculation to justify your answer.

12.Write one everyday situation in which you might need to convert between metric and imperial units. Name the two units you would convert between.