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To measure is to compare the dimensions, quantity, or capacity with a standard. There are several systems of measurement. The two used most often are called the English and the metric systems (also called SI, or The International System). In the United States, the English system is used most often. While most other parts of the world use the metric system. The basic units used in the metric system are: Length in meters (m), Mass in kilograms (kg), and Time in seconds (s). The basic units used in the metric system are: Length in yards (yd), Weight in pounds (lb), and Time in Seconds (s). The English units of measurement have many drawbacks: the most significant is in the complexity of converting from one unit to another, such as from yards to feet.

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The Modern Metric System Dictionary of metric units explaining the principles and history of the system. homepage.ntlworld.com/cdkaese/home.htm

CyberSleuth: Units of Measurements Worksheets Twenty-three printable worksheets for elementary school-aged children. Focuses primarily on conversion of units of length. cybersleuth-kids.com/../../../Units_of_Measurement

Metric Conversion Tutorial Step-by-step, interactive tutorial for converting metric units. chemistry.boisestate.edu/rbanks/inorganic/metricconversion1.htm

Convert-me.Com Interactive calculators for many common and exotic measurement systems, including metric, Ancient Greek, Roman, and old Russian. www.convert-me.com/en

Measurement Worksheets Features printable worksheets. Includes English and Metric System pages. www.edhelper.com/measurement.htm

A Dictionary of Units 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. www.ex.ac.uk/cimt/dictunit/dictunit.htm

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. www.metric4us.com

FAQ: How do I read a ruler? Instructions on how to use metric and English rulers. www.onlineconversion.com/faq_05.htm

Jack's Math Provides several methods for determining length, width and height. www.nps.gov/whmi/educate/ortrtg/11or1.htm

Measuring Angle and Distance with your Thumb How to use body parts to estimate measurements. www.vendian.org/mncharity/dir3/bodyruler_angle

Metric Conversion Java metric conversion calculator for length, weight, pressure, and volume. www.worldwidemetric.com/metcal.htm

How Many? 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. www.unc.edu/~rowlett/units/index.html

Metric Conversion Tables Conversion factors and online calculators for metric and imperial units. www.metric-conversion-tables.com

Temperature Converter Fahrenheit Celsius (Centigrade) A temperature converter for Celsius and Fahrenheit. www.albireo.ch/temperatureconverter

Unit Conversions Online conversions from physics units to other physics units. Includes a comprehensive set of units with definitions. www.chemie.de/tools/units.php3?language=e

Funbrain.com Measurement game - Game which has several levels of difficulty for both English and metric rulers. www.funbrain.com/measure

How To Read A Ruler Article describes all of those little lines and markings. www.woodzone.com/articles/Read_A_Ruler.htm

Origins of Measurements Compares units of ancient times with modern ones. www.iofm.net/community/kidscorner/maths/origin.htm

The Ruler Game Timed game will test how quick you can read a ruler. www.rickyspears.com/rulergame

Metric Measures Offers equivalents for common measurements, plus how metric units are used in sports and the kitchen. www.nist.gov/public_affairs/kids/metric.htm

Apples4theteacher.com Measure the teddy bears game. www.apples4theteacher.com/measure.html

Conversion Calculator A simple calculator to convert between various units. www.thehaws.org/convert.shtml

GCSE Maths: Measurement Includes length, area and volume and the use of prefixes in units. With worked examples and animations. www.gcse.com/maths/measurement.htm