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Year groups show where this is usually met in England. Other countries order topics differently, so use the age as a guide, not a rule.
A tip for measurement
Learn the three conversions, 10, 100 and 1000, and almost every metric question becomes multiplying or dividing by one of them.
More measurement worksheets

Convert Units of Length
Convert between millimetres, centimetres, metres and kilometres.
Year 4 · ages 8–9
Convert Grams and Kilograms
Sixteen conversions between grams and kilograms, including mixed amounts like 1 kg 500 g.
Year 4 · ages 8–9
Convert Millilitres and Litres
Convert between millilitres and litres, including mixed amounts such as 2 l 250 ml.
Year 4 · ages 8–9Practise on a screen with MathBase
The free-to-start maths app for ages 3–20, with games, lessons and a progress report for parents. No ads.