How to Convert Weight and Mass Units
Convert between different units of weight and mass instantly. Our converter handles everything from everyday units like pounds and kilograms to smaller units like ounces and grams, perfect for cooking, shipping, or health tracking.
Understanding Weight Units
Weight measures the force of gravity on an object, while mass measures the amount of matter. In everyday use, these terms are often interchangeable. The metric system uses grams and kilograms, while the imperial system uses ounces and pounds.
Common Weight Conversions
Key conversion factors: 1 pound = 453.592 grams = 16 ounces, 1 kilogram = 2.205 pounds = 1000 grams, 1 ounce = 28.35 grams.
Example:
To convert 150 pounds to kilograms: 150 ÷ 2.205 = 68.04 kg. To convert 2.5 kg to pounds: 2.5 × 2.205 = 5.51 lbs.
Common Use Cases
Real-world applications for this calculator
Cooking & Recipes
Convert recipe ingredients between grams, ounces, and pounds when using international recipes.
Health & Fitness
Track body weight in your preferred unit system or convert between gym equipment weights.
Shipping & Postage
Calculate shipping weights to determine postage costs, especially for international packages.
Tips
- Quick estimate: 1 kg ≈ 2.2 lbs, so double the kg and add 10% for a rough lb conversion.
- For cooking: 1 cup of water weighs about 240 grams or 8.5 ounces.
- Body weight often fluctuates 1-2 kg (2-4 lbs) daily due to water retention.
Frequently Asked Questions
How many pounds are in a kilogram?
There are approximately 2.205 pounds in one kilogram. To convert kg to lbs, multiply by 2.205. For example, 70 kg = 70 × 2.205 = 154.35 pounds.
How do I convert ounces to grams?
Multiply ounces by 28.35 to get grams. For example, 8 ounces = 8 × 28.35 = 226.8 grams. This is useful for cooking conversions.
What is the difference between weight and mass?
Mass is the amount of matter in an object and stays constant. Weight is the force of gravity on that mass and varies by location. On Earth, we use the terms interchangeably, but a 70 kg person would weigh less on the Moon.
How many ounces are in a pound?
There are 16 ounces in one pound. To convert pounds to ounces, multiply by 16. For example, 2.5 pounds = 2.5 × 16 = 40 ounces.