Weight Converter: Convert Between kg, lbs, Grams, Ounces, and Stones
Weight is measured differently around the world. Kilograms dominate in most countries and all scientific contexts. Pounds are used in the United States. Stones remain common in the UK and Ireland. Grams and ounces appear in food and pharmaceutical contexts. This converter handles all five units instantly.
The Conversion Formulas
1 kilogram = 2.20462 pounds
1 pound = 0.453592 kg
1 stone = 6.35029 kg = 14 pounds
1 ounce = 0.0283495 kg
1 kg = 1000 grams
Worked Examples
70 kg to pounds: 70 × 2.20462 = 154.3 lbs
165 lbs to kg: 165 × 0.453592 = 74.8 kg
12 stone 4 lbs to kg: (12 × 6.35029) + (4 × 0.453592) = 76.20 + 1.81 = 78.0 kg
Convert any weight instantly with our Weight Converter.
Common Weight Conversions
| Kilograms | Pounds | Stones & Lbs |
|---|
| 50 kg | 110.2 lbs | 7 st 12 lbs |
| 60 kg | 132.3 lbs | 9 st 6 lbs |
| 70 kg | 154.3 lbs | 11 st 0 lbs |
| 80 kg | 176.4 lbs | 12 st 8 lbs |
| 90 kg | 198.4 lbs | 14 st 2 lbs |
| 100 kg | 220.5 lbs | 15 st 10 lbs |
When You Need Weight Conversion
- BMI calculation. Requires weight in consistent units — converting incorrectly changes your BMI result significantly.
- Drug dosing. Many medications are dosed in mg per kg. Patients who know their weight in pounds need conversion for accurate dosing.
- Nutrition labels. UK nutrition labels use grams per 100g. US labels use ounces. Converting helps compare products accurately.
- International travel. Weight limits on airlines may be stated in kg or lbs depending on the airline and route.
- Fitness tracking. Training logs, dietary protocols, and calorie tracking apps may use different units based on region.
Practical Tips
Weigh yourself at the same time each day for consistent tracking — morning, after using the bathroom, before eating or drinking. Daily weight can vary 1–2 kg from fluids alone.
Track weekly averages rather than individual daily readings to smooth out fluid fluctuations and see the genuine trend.
Use a calibrated scale. Many bathroom scales drift over time. Test against a known weight periodically.
Final Thoughts
Weight conversion is a small but important skill in health, nutrition, and daily life. Whether you are tracking BMI, calculating protein targets in grams, or simply decoding a UK weight in stones, this tool handles the conversion in one step.
Convert any weight unit with our free Weight Converter.