A summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion factors needed to change them into a standard unit.

Measure the teddy bears game.

A simple calculator to convert between various units.

Interactive calculators for many common and exotic measurement systems, including metric, Ancient Greek, Roman, and old Russian.

Twenty-three printable worksheets for elementary school-aged children. Focuses primarily on conversion of units of length.

Instructions on how to use metric and English rulers.

Measurement game - Game which has several levels of difficulty for both English and metric rulers.

Includes length, area and volume and the use of prefixes in units. With worked examples and animations.

A dictionary of units of measurement: explanations of the metric system, System Internationale (SI), English customary system, and other modern measuring systems. Plus extensive links to other measurement-related Internet resources.

Article describes all of those little lines and markings.

Provides several methods for determining length, width and height.

Features printable worksheets. Includes English and Metric System pages.

How to use body parts to estimate measurements.

A site promoting the metric system which argues why metric is better and English is worse. Provides an English-metric online calculator.

Java metric conversion calculator for length, weight, pressure, and volume.

Conversion factors and online calculators for metric and imperial units.

Step-by-step, interactive tutorial for converting metric units.

Offers equivalents for common measurements, plus how metric units are used in sports and the kitchen.

Gives equal values for areas, volumes, circle measurements, computer storage, currencies, distance and length, energy, fuel consumption, power, pressure, speed, temperature, time, torque, and weights.

Compares units of ancient times with modern ones.

A temperature converter for Celsius and Fahrenheit.

Dictionary of metric units explaining the principles and history of the system.

Timed game will test how quick you can read a ruler.

Online conversions from physics units to other physics units. Includes a comprehensive set of units with definitions.