Weight Converter
Convert weight units (kg, lbs, oz).
Weight Converter
Weight Converter
Everything you need to know
About the Weight Converter
Weight and mass measurements vary dramatically across countries and industries. The United States uses pounds and ounces, most of the world uses kilograms and grams, and the UK still uses stones for body weight. Our weight converter handles all major units instantly.
Supported conversions:
- Pounds (lb) ↔ Kilograms (kg)
- Ounces (oz) ↔ Grams (g)
- Stones (st) ↔ Pounds/Kilograms
- Tons (US/Metric/Imperial) ↔ Any unit
- Milligrams (mg) ↔ Grams
- Micrograms (mcg) ↔ Milligrams
Key Conversion Factors
| From | To | Multiply By |
|---|---|---|
| Pounds (lb) | Kilograms (kg) | 0.453592 |
| Kilograms (kg) | Pounds (lb) | 2.20462 |
| Ounces (oz) | Grams (g) | 28.3495 |
| Grams (g) | Ounces (oz) | 0.035274 |
| Stones (st) | Pounds (lb) | 14 |
| Stones (st) | Kilograms (kg) | 6.35029 |
| Metric tons (t) | Kilograms (kg) | 1,000 |
| US tons (short) | Pounds (lb) | 2,000 |
| Imperial tons (long) | Pounds (lb) | 2,240 |
Quick Reference Tables
Pounds to Kilograms
| Pounds | Kilograms |
|---|---|
| 1 lb | 0.45 kg |
| 5 lb | 2.27 kg |
| 10 lb | 4.54 kg |
| 25 lb | 11.34 kg |
| 50 lb | 22.68 kg |
| 100 lb | 45.36 kg |
| 150 lb | 68.04 kg |
| 200 lb | 90.72 kg |
Kilograms to Pounds
| Kilograms | Pounds |
|---|---|
| 1 kg | 2.20 lb |
| 5 kg | 11.02 lb |
| 10 kg | 22.05 lb |
| 25 kg | 55.12 lb |
| 50 kg | 110.23 lb |
| 75 kg | 165.35 lb |
| 100 kg | 220.46 lb |
Ounces to Grams (Cooking)
| Ounces | Grams |
|---|---|
| 1 oz | 28 g |
| 2 oz | 57 g |
| 4 oz | 113 g |
| 8 oz | 227 g |
| 16 oz (1 lb) | 454 g |
Common Weight References
| Item | Weight |
|---|---|
| Paperclip | ~1 gram |
| AA battery | ~23 grams |
| Smartphone | ~150-200 grams |
| Basketball | ~620 grams (22 oz) |
| House cat | 4-5 kg (9-11 lb) |
| Bowling ball | 7-8 kg (15-16 lb) |
| Adult human (male) | 70-90 kg (155-200 lb) |
| Adult human (female) | 55-75 kg (120-165 lb) |
| Suitcase (packed) | 20-30 kg (44-66 lb) |
| Golden Retriever | 25-35 kg (55-75 lb) |
| Motorcycle | 150-250 kg (330-550 lb) |
| Compact car | 1,200-1,500 kg (2,600-3,300 lb) |
| African elephant | 4,000-7,000 kg (4-7 metric tons) |
Body Weight Around the World
| Country | Average Male Weight | Average Female Weight |
|---|---|---|
| United States | 90 kg (198 lb) | 77 kg (170 lb) |
| UK | 84 kg (185 lb) | 70 kg (154 lb) |
| Japan | 68 kg (150 lb) | 53 kg (117 lb) |
| Germany | 85 kg (187 lb) | 69 kg (152 lb) |
| India | 60 kg (132 lb) | 52 kg (115 lb) |
| Australia | 86 kg (190 lb) | 72 kg (159 lb) |
| Brazil | 75 kg (165 lb) | 65 kg (143 lb) |
Cooking and Baking Conversions
Common Ingredient Weights
| Ingredient | 1 Cup | 1 Tablespoon | 1 Teaspoon |
|---|---|---|---|
| All-purpose flour | 120 g (4.25 oz) | 8 g (0.28 oz) | 3 g (0.1 oz) |
| Granulated sugar | 200 g (7 oz) | 12 g (0.4 oz) | 4 g (0.14 oz) |
| Brown sugar (packed) | 220 g (7.75 oz) | 14 g (0.5 oz) | 5 g (0.18 oz) |
| Butter | 227 g (8 oz) | 14 g (0.5 oz) | 5 g (0.17 oz) |
| Honey | 340 g (12 oz) | 21 g (0.75 oz) | 7 g (0.25 oz) |
| Milk | 240 g (8.5 oz) | 15 g (0.5 oz) | 5 g (0.17 oz) |
Shipping and Logistics
Dimensional Weight (Volumetric Weight)
Shipping carriers charge by actual weight or dimensional weight, whichever is greater:
Formula: Dimensional Weight = (Length × Width × Height) ÷ Divisor
| Carrier/Service | Divisor (inches) | Divisor (cm) |
|---|---|---|
| UPS/FedEx (domestic) | 139 | 5,000 |
| UPS/FedEx (international) | 139 | 5,000 |
| USPS | 166 | 6,000 |
| DHL | 139-166 | 5,000-6,000 |
Example: Box measures 20" × 15" × 12", actual weight 8 lb
- Dimensional weight = (20 × 15 × 12) ÷ 139 = 25.9 lb
- Billed at 26 lb (dimensional weight wins)
Weight in Science and Medicine
Metric Prefixes
| Prefix | Symbol | Factor | Example |
|---|---|---|---|
| Kilogram | kg | 10³ | 1 kg = 1,000 g |
| Gram | g | 10⁰ | Base unit |
| Milligram | mg | 10⁻³ | 1 mg = 0.001 g |
| Microgram | mcg/μg | 10⁻⁶ | 1 mcg = 0.000001 g |
| Nanogram | ng | 10⁻⁹ | 1 ng = 0.000000001 g |
Medication Dosing
Medications are dosed by weight, making accurate conversion critical:
Example: Child weighs 35 lb, medication dose is 10 mg/kg
- 35 lb × 0.453592 = 15.88 kg
- Dose: 15.88 kg × 10 mg/kg = 158.8 mg
Frequently Asked Questions
What's the difference between mass and weight?
Mass is the amount of matter (constant everywhere). Weight is the force of gravity on that mass (varies by location). On the Moon, you weigh 1/6 as much but have the same mass.
Why does the UK use stones for body weight?
Tradition. One stone = 14 pounds. It's less common now but still used in everyday conversation (e.g., "I weigh 11 stone").
How do I convert my luggage weight for international flights?
Most airlines outside the US list limits in kilograms. 23 kg (standard checked bag limit) = 50.7 lb. 7 kg (carry-on limit) = 15.4 lb.
What's a "short ton" vs. "long ton" vs. "metric ton"?
- Short ton (US): 2,000 lb (907 kg)
- Long ton (UK): 2,240 lb (1,016 kg)
- Metric ton (tonne): 1,000 kg (2,205 lb)
Why do recipes use weight instead of volume?
Weight is more accurate. A cup of flour can vary by 20% depending on how it's packed. 120 grams of flour is always 120 grams.