Games--online
This link teaches how to measure using the metric system.  It is great for the interactive white board.  It has conversions within that measurement system.  http://www.teachingmeasures.co.uk/menu.html

This website is a virtual ruler.  It allows you to learn how to use a ruler by measuring various objects.  Great resource on the computer or on the interactive whiteboard: http://www.quizville.com/measuring.php

This interactive game teaches you how weigh mass using scales.  You are to measure animals and match the mass with the weights.  It uses metric (grams) and standard (pounds) http://www.bbc.co.uk/education/mathsfile/shockwave/games/animal.html

This game teaches metric conversions with capacity.  You are a server and you have to complete as many orders as possible in five minutes.

Equivalent Customary Measures matching game

Equivalent Metric Measures matching game

This webpage has various games and activities on it. There are drills with "drag and drop," "scrollable," and flashcards on the various measurement skills. http://www.mrnussbaum.com/measurement.htm

Below are links to the games on that webpage:
Sal's Sub Shop
 Skills: Measuring using centimeters and inches, fractions Object: Make eight subs in three minutes by using your precise measuring skills to fulfill odd customer orders. Visit Sal's Sub Shop Now!
Horrendous Soup
 Skills: Metric mass, distance, and capacity conversions Object: Make the worst soup ever known to mankind with your awesome metric conversion skills. Visit Horrendous Soup Now!
Matthew Metric's Gum Parlor (grades 4 and up)
 Skills:Converting to metric units of distance Object:Sell as much gum as possible in five minutes by converting customer orders to metric units. Visit Matthew Metric's Gum Parlor Now!
Computation Castle (grades 4 and up)
 Skills:Fractions, Rounding, Place Value, Metrics, Exponents Object:Save the Royal Family at Computation Castle by using your math skills to make the correct potions. Visit Computation Castle Now!

FunBrain has three levels for each of the metric and customary/standard measurements of length: http://www.funbrain.com/measure/

Learning how to measure using a simple scale:

Learning how to measure using a balance:

(Measurement and Algebra) Equivalency scale:

(Measurement and Algebra) Scale: http://pbskids.org/cyberchase/games/algebra/

Linear Measurements:

Linear measurements US standard/customary: http://www.rickyspears.com/rulergame/

Learning how to measure using units: http://www.apples4theteacher.com/measure.html

Converting temperatures from celsius, fahrenheit, and Kelvin: http://www.apples4theteacher.com/temperature-conversion.html

Conversion measurement: length, mass, volume: http://www.mathcats.com/explore/convert.html

Metric system PowerPoint activities: http://math.pppst.com/metrics.html

Liquid measurement PowerPoint:

Printable resources (quizzes, activities, worksheets)