From a tiny guinea pig to a giant elephant — every animal can be measured. Let's learn the metric system!
Which unit fits best? Think: is it length, mass (weight) or capacity — and how big is it?
Use the tables above to help. Type your answer, then press Check.
💡 For grown-ups: covers KS2 measurement — metric units for length, mass and capacity, and converting between them (mm/cm/m/km, g/kg, ml/l). Extend with real measuring: weigh a class pet in grams, measure the classroom in metres, or fill a container in millilitres. Very heavy animals (like elephants) are often given in tonnes (1 tonne = 1000 kg) — a nice challenge.