Science Made Simple
Science Made Simple: Online Metric Converter
Practice converting English units of measurement to metric units using this tool.
Math Is Fun
Math Is Fun: Metric Length
The different units used to measure metric length are described, with comparisons to real world objects. A wonderful number line also shows the relative sizes of things all the way from a quark to the universe in powers of ten.
Khan Academy
Khan Academy: Estimating Length (Mm, Cm, M, Km)
Practice estimating the length of real life objects using metric units. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
CK-12 Foundation
Ck 12: Measurement: Metric Length Comparison
[Free Registration/Login may be required to access all resource tools.] Convert metric lengths to the same unit and compare.
Other
Science Made Simple: Area Conversions
This site, which is provided for by Science Made Simple, allows you to enter an amount into an area conversion calculator.
ABCya
Ab Cya: Strolling With My Gnomies, a Measuring Game
Decide whether you want to measure in Standard or metric and at what level (i.e. inch, half inch or centimeter, millimeter) and begin practice. Computer will generate a line above the ruler and the player enters the length and checks for...
Other
Nanozone: Nanoconverter
Use the nanoconverter to convert inches, feet, or miles (or millimeters, centimeters, or meters) into nanometers.