Converting Weight in Metric & U.S. Customary Systems

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• 0:00 Measuring Weight
• 1:05 Grams and Ounces
• 2:15 Kilograms and Pounds
• 3:05 Metric Tons and Tons
• 3:50 Lesson Summary

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Lesson Transcript
Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught math at a public charter high school.

You may think that converting weight measurements from one system to another is tricky, but after watching this video lesson, you will be ready to convert any kind of weight measurement you encounter.

Measuring Weight

There are two measurement systems used in our world. We have the metric system and the U.S. standard system. The metric system uses the units of grams, kilograms, and metric tons to measure mass or weight. The U.S. standard system uses units of ounces, pounds, and tons to measure mass or weight.

If you do any kind of traveling outside of the United States, you may have noticed that the majority of the world uses the metric system of grams, kilograms, and metric tons for measuring the mass or weight of things. If you grew up in the United States, you are probably not too familiar with those units. You are probably more familiar with ounces, pounds, and tons.

In this lesson, we will see how you can easily convert from the metric system to the U.S. standard system and vice versa. We will use the short ton that is equal to 2,000 pounds. We will see how to convert from grams to ounces and from ounces to grams, from kilograms to pounds and from pounds to kilograms, and finally, from metric tons to tons and from tons to metric tons. I will give you a table at the end that summarizes all the special numbers that you need to know.

Converting Grams and Ounces

Let's begin with the grams to ounces conversion. We will use these equivalence equations:

1 gram = 0.0353 ounces
1 ounce = 28.35 grams

These equations of equivalence tell us how to make our conversions. To convert grams to ounces, we multiply by 0.0353. So, 2 grams is equal to 2 * 0.0353 = 0.0706 ounces. To convert ounces to grams, we multiply by 28.35. So, 3 ounces is equal to 3 * 28.35 = 85.05 grams.

As you can see, we look at our equivalence equations and we do exactly what they tell us. The first equation tells us that 1 gram is equal to 0.0353 ounces, so to go from grams to ounces, we multiply by what each gram is equivalent to, 0.0353. We did the same for converting ounces to grams. We used the equation that tells us what each ounce equals.

Converting Kilograms and Pounds

To convert kilograms to pounds, we do the same thing with the equivalence equation that tells us what each kilogram equals in pounds. The equations we use to convert between these two units are these:

1 kilogram = 2.2046 pounds
1 pound = 0.4536 kilograms

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