Math Playground
Measurement

Metric length

mm, cm, m, km — base 10, easy to convert.

Metric length scales by tens.

Type a value, pick units
2,500

1 km = 1,000 m

The metric length ladder

  • kmmcmmm — each step down is ×10 (or ×1000 between km and m).
  • 1 km = 1000 m · 1 m = 100 cm · 1 cm = 10 mm.
  • Going down a step: move the decimal right. Going up: move it left.
Your turn

Convert 3.4 m to centimetres.

Watch out

Don't multiply by 10 between km and m — that jump is ×1000, not ×10. Only mm↔cm↔m steps are ×10.

Conversions

  • 1 cm = 10 mm
  • 1 m = 100 cm = 1000 mm
  • 1 km = 1000 m