An introduction to the basics of capacity and volume. Watch the video clips, read through the factsheets or work through the worksheets.

This provides an explanation of imperial and metric units. There are examples of the different units used for length, weight and capacity in the two systems and details on how to convert between metric and imperial units. Watch the video introduction, read through the factsheets or test your knowledge with the worksheets.

An introduction to units of length together with information on how to read scales and convert between some metric units of length. There are videos, fact sheets and exercises to help you.

An introduction to metric units of weight, reading of scales ro measure weight and converting between metric units of weight. Watch the video or work though the factsheets and worksheets.

This page explains how to convert between common metric units (kilo, centi and milli prefixes). It also shows how to convert between metric and imperial units of length, mass and capacity.

There is a helpful summary, with examples, of how to convert between common metric units of length, mass and capacity. There are practice questions and exercises which can be automatically checked when you are ready.

A useful reference for the meaning of the twenty SI prefixes.