Conversions
Customary and/or Metric (customizable): http://www.homeschoolmath.net/worksheets/measuring.php
(Older Kids) Study Jams Customary Measurement: http://studyjams.scholastic.com/studyjams/jams/math/measurement/units-of-length.htm
(Older Kids) Study Jams Customary Measurement: http://studyjams.scholastic.com/studyjams/jams/math/measurement/units-of-length.htm
Conversions
Customary and/or Metric (customizable): http://www.homeschoolmath.net/worksheets/measuring.php