Weight & Mass
Understand and convert weight and mass measurements
lessons (2)
Metric Weight Units (g, kg)
Learn about grams and kilograms, and how to convert between metric weight units.
Metric Mass Units (mg, g, kg, t)
Learn all metric mass units from milligrams to tonnes and how to convert between them.
Weight and mass measurements are used in cooking, shipping, science, and everyday life. Understanding both metric (grams, kilograms) and imperial (ounces, pounds) systems and converting between them is practical knowledge for international contexts.
What Students Will Learn
- Convert within the metric mass system
- Convert within the imperial weight system
- Convert between metric and imperial units
- Estimate reasonable weights
- Solve real-world weight problems
Frequently Asked Questions
What is the difference between weight and mass?
Mass is the amount of matter in an object (constant everywhere). Weight is the force of gravity on that mass (varies by location). On Earth, we often use them interchangeably.
What are key metric conversions?
1000 mg = 1 g, 1000 g = 1 kg, 1000 kg = 1 metric ton. The metric system uses powers of 10.
What are key imperial conversions?
16 ounces = 1 pound, 2000 pounds = 1 ton (US). 1 kg ≈ 2.2 pounds.