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The Math League
The Math League: Metric Units and Measurement
This metric system tutorial is compared to the U.S. standard system so that students can comprehend the measurement of length, volume, mass and the like.
University of North Carolina
A Dictionary of Units of Measurement
This site contains an extensive list of various units of measurement known internationally and across several disciplines. Unit symbols are also included.
Louisiana Department of Education
Louisiana Doe: Louisiana Believes: Eureka Math Parent Guide Unit Conversions & Problem Solving With Metric Measurement
A guide to support parents as they work with their students in unit conversions and problem solving with metric measurement.
Other
Conversions for Weight Measurements
This site allows you to convert weight/mass measurements. For example converting tons to grams. CCSS.Math.Content.3.MD.A.2 Measure and estimate liquid volumes and masses of objects using standard units
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...