5:35 Metric Units of Length | Convert mm, cm, m and km
Clear step-by-step guide to converting between mm, cm, m and km.
Units of length and distance
Convert between units of length to make comparisons and solve problems
5 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
Sort
Level
Length
Origin
5 shown 5:35 
6:58 Converting Metric Units for Length
Corbettmaths explains converting between millimetres, centimetres, metres and kilometres.
13:01 Maths Help - Converting Units of Length
Patient walkthrough of the simple steps for converting mm to cm to m to km.
10:58 Math Antics - Measuring Distance
Engaging Math Antics lesson on measuring and converting distances between metric units.
6:20 GCSE Biology - How to convert between nm, um, mm, m and km (2026/27 exams)
UK exam-focused conversions across nm to km, including multi-step and standard form.