Weight Converter
Convert between weight units
10+ units
Swap functionality
Copy results
The shipping label says 5 kilograms. Your bathroom scale shows pounds. The recipe calls for 250 grams of flour. Your measuring cups show ounces. The international package limit is 30 kg but you only think in pounds.
Weight and mass conversions are everywhereβshipping, cooking, fitness, travel, science. Different countries use different systems, and you're stuck doing math in your head. This converter handles it all instantly.
What is Weight Conversion?
Weight conversion transforms mass measurements between metric (gram-based) and imperial/US customary (pound-based) systems. While technically "mass" and "weight" differ (weight depends on gravity), for everyday purposes on Earth they're used interchangeably.
Key conversions:
1 pound = 453.592 grams
1 kilogram = 2.20462 pounds
1 ounce = 28.3495 grams
1 stone = 14 pounds = 6.35 kg
1 metric ton = 1000 kg = 2204.62 lbs
For rough kg to lbs: double and add 10%. (10 kg β 22 lbs). For lbs to kg: halve and subtract 10%. (100 lbs β 45 kg)
Why People Actually Need This Tool
The US uses pounds and ounces. Most of the world uses kilograms and grams. International commerce requires constant conversion.
-
Shipping β Calculate package weights for international carriers.
-
Cooking β Convert recipe measurements between metric and imperial.
-
Fitness tracking β Translate body weight between kg and lbs.
-
Travel β Understand luggage weight limits in local units.
-
Nutrition β Convert food portions for calorie tracking.
-
Postal services β Determine mailing costs based on weight thresholds.
-
Industrial β Convert material weights for international specifications.
How to Use the Weight Converter
-
Enter value β The weight measurement you want to convert.
-
Select from unit β Your current unit of measurement.
-
Select to unit β Your target unit.
-
View conversion β Instant result with full precision.
| Unit | System | Common Use |
|---|---|---|
| Milligram | Metric | Medication, vitamins, small quantities |
| Gram | Metric | Cooking, food portions, jewelry |
| Kilogram | Metric | Body weight, shipping, groceries |
| Ounce | Imperial | Food portions, postal, cooking (US) |
| Pound | Imperial | Body weight (US/UK), shipping, produce |
| Stone | Imperial | Body weight (UK/Ireland traditional) |
| Ton | Both | Vehicles, industrial, cargo |
Metric tonne = 1000 kg. US short ton = 2000 lbs (907 kg). UK long ton = 2240 lbs (1016 kg). Know which "ton" you're dealing with.
Real-World Use Cases
1. The International Shipping
Context: Sending package to Europe, carrier shows 5 lb limit for flat rate.
Problem: Package weighs 2.1 kg. Will it fit?
Solution: 2.1 kg = 4.63 lbs. Under the 5 lb limit.
Outcome: Correct shipping option selected.
2. The Luggage Weight
Context: Flying international, baggage limit is 23 kg.
Problem: American scale shows 48 lbs. Is that over?
Solution: 48 lbs = 21.8 kg. Under the 23 kg limit.
Outcome: No overweight fees at check-in.
3. The Recipe Conversion
Context: European recipe calls for 500g of flour.
Problem: American measuring cups, need ounces or cups.
Solution: 500g = 17.6 oz β 4 cups flour (by weight).
Outcome: Recipe proportions maintained.
4. The Body Weight Tracking
Context: Gym shows weight in kg, home scale in lbs.
Problem: Gained 2 kg at gym. How much in pounds?
Solution: 2 kg = 4.4 lbs. That's the progress.
Outcome: Consistent weight tracking across equipment.
5. The Produce Shopping
Context: Farmer's market prices per pound. Recipe needs 300g.
Problem: How many pounds to buy?
Solution: 300g = 0.66 lbs. Buy about 3/4 pound.
Outcome: Correct quantity purchased without waste.
6. The Medication Dosage
Context: Pet medication dosed at 10mg per kg body weight.
Problem: Dog weighs 55 lbs. What's the kg weight?
Solution: 55 lbs = 24.9 kg. Dose: 249 mg.
Outcome: Accurate medication dosing for pet safety.
7. The UK Body Weight
Context: British relative says they weigh 12 stone.
Problem: What's that in kg or lbs?
Solution: 12 stone = 168 lbs = 76.2 kg.
Outcome: Understanding weight in familiar units.
Common Mistakes and How to Avoid Them
Small rounding errors multiply. For medication and shipping near weight limits, keep full precision.
Privacy and Data Handling
This Weight Converter operates entirely in your browser.
- No measurements are sent to any server.
- No conversions are stored.
- No account required.
- Works completely offline.
Your data stays private.
Conclusion
Weight conversion bridges measurement systems used by different countries and industries. Whether you're shipping packages, following recipes, tracking fitness, or traveling internationally, you'll encounter weights in unfamiliar units.
This converter handles the math instantly. Enter any weight, get any unit, avoid mental arithmetic errors.
The world weighs things differently. Now you can work in any units.