If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Unit conversion

5 videos
1 skill
When you first started measuring things in units in 2nd grade, you saw that you might want to use different units depending on the scale, application or culture that you are in. You can imagine that you'd want to convert from one unit to another when needed. Whether we're moving between metric and U.S. customary units, between ounces and pounds, or between meters and kilometers....these conversion examples and explanations are going to help a lot! Common Core Standard: 4.MD.A.1

Converting between units of time

VIDEO 3:22 minutes
We want you to feel comfortable moving between seconds, minutes, and hours. Let's create some tables where we compare and covert these measurements of time.

Converting U.S. customary units of distance: feet to inches

VIDEO 0:51 minutes
Here's a practice example that gets us thinking about how change feet to inches. Will you get any feet of snow this winter? How many inches is that? Come on, snow days!

Converting metric units of distance: kilometers, meters, centimeters

VIDEO 2:37 minutes
Even if you live the U.S. don't assume that you won't use metric distance units. There are lots of situations where your knowledge of kilometers, for example, will come in handy.

Converting U.S. customary units of fluid volume

VIDEO 2:37 minutes
Moving easily between gallons, quarts, pints, cups, and fluid ounces makes you really valuable in a ton of different situations.

Converting metric and U.S. customary units of weight

VIDEO 4:24 minutes
We're converting kilograms to milligrams and tons to ounces. Let's do this example together.

Converting to smaller units

PRACTICE PROBLEMS