Student resources
Grades 3-8
Weight Conversion Chart for Students
Weight and mass are used to describe how heavy something is. In school science, mass is often measured in grams and kilograms. In everyday US measurements, ounces and pounds are common.
Key ideas
- 1 pound equals 16 ounces.
- 1 kilogram equals 1,000 grams.
- 1 metric ton equals 1,000 kilograms.
- Grams are useful for small objects; kilograms are useful for heavier objects.
Weight and Mass Conversions
| Conversion | Equals | Use for |
|---|---|---|
| 1 lb | 16 oz | Body weight and packages |
| 1 ton | 2,000 lb | Very heavy objects |
| 1 g | 1,000 mg | Small masses |
| 1 kg | 1,000 g | Food, school science, luggage |
| 1 metric ton | 1,000 kg | Large masses |
Practice questions
How many ounces are in 3 pounds?
Answer: 48 ounces
How many grams are in 2.5 kilograms?
Answer: 2,500 grams
Which is heavier: 900 grams or 1 kilogram?
Answer: 1 kilogram