Convert-me.Com
Interactive calculators for many common and exotic measurement systems, including metric, Ancient Greek, Roman, and old Russian.
CyberSleuth: Units of Measurements Worksheets
Twenty-three printable worksheets for elementary school-aged children. Focuses primarily on conversion of units of length.
FAQ: How do I read a ruler?
Instructions on how to use metric and English rulers.
Funbrain.com
Measurement game - Game which has several levels of difficulty for both English and metric rulers.
GCSE Maths: Measurement
Includes length, area and volume and the use of prefixes in units. With worked examples and animations.
Measurement Worksheets
Features printable worksheets. Includes English and Metric System pages.
Measuring Angle and Distance with your Thumb
How to use body parts to estimate measurements.
Metric 4 US
A site promoting the metric system which argues why metric is better and English is worse. Provides an English-metric online calculator.
Metric Conversion Chart
Online metric conversion calculator includes metric, US customary and Imperial unit conversions.
Metric Conversion Tables
Conversion factors and online calculators for metric and imperial units.
Temperature Converter Fahrenheit Celsius (Centigrade)
A temperature converter for Celsius and Fahrenheit.
Unit Conversions
Online conversions from physics units to other physics units. Includes a comprehensive set of units with definitions.