Purple Math
Purplemath: Metric Units & Converting Between Them
This resource demonstrates how to convert between various sizes of metric units quickly and easily. Metric units are very nice to work with, since they are all multiples of ten (or a hundred, or one-tenth, etc) of each other. You can...
Other
World Wide Metric Calculator
Do you need a quick conversion from metric units to imperial units or just the reverse? Use this resource for conversions of length, weight, pressure, and volume.
Annenberg Foundation
Annenberg Learner: Math in Daily Life: Converting to the Metric System
An introduction to the metric system and converting to the metric system. Provides a table of common conversions and steps for converting a cookie recipe to the metric system.
Primary Resources
Primary Resources: Measures
A huge collection of teacher resources to aide in the teaching of all types of metric measurement: length, distance, mass, weight, capacity, and volume. Activities include measuring, estimating, converting, investigating, and finding...