How to use the weight converter
Type a number into any box – kg, lb, grams, ounces or stone – and all the others update instantly. You'll also see the weight as pounds and ounces and as stone and pounds. Tap any row in the chart to load that weight.
Weight conversion formulas
- 1 pound (lb) = 0.45359237 kg exactly – about 453.6 grams.
- 1 kilogram = 2.20462 lb. To convert kg to lb, multiply by 2.20462; to convert lb to kg, divide by 2.20462.
- 1 lb = 16 ounces, and 1 ounce ≈ 28.35 grams.
- 1 stone = 14 lb ≈ 6.35 kg (stone is mostly used in the UK for body weight).
Example: 70 kg × 2.20462 = 154.3 lb, which is 11 stone 0.3 lb. And 150 lb ÷ 2.20462 = 68.0 kg.
Quick mental trick: to estimate pounds, double the kilograms and add 10%. For 70 kg: 140 + 14 = 154 lb – very close to the exact 154.3.
Common conversions
| Kilograms | Pounds |
|---|---|
| 1 kg | 2.2 lb |
| 5 kg | 11.0 lb |
| 23 kg (common checked-bag limit) | 50.7 lb |
| 50 kg | 110.2 lb |
| 70 kg | 154.3 lb |
| 100 kg | 220.5 lb |
Kilograms vs pounds around the world
The kilogram is the official unit of mass in almost every country, including India, where weights in shops, hospitals and official documents are given in kg and grams. The United States still uses pounds and ounces for most everyday weights, and in the UK people often describe body weight in stone and pounds. That's why fitness videos, US recipes and product listings from abroad so often need converting. Since 2019, the kilogram itself has been defined using a fixed value of the Planck constant – a law of physics – rather than a metal cylinder kept in France.
Where you'll need it
- Gym and fitness: many weight plates and apps use pounds. Check your BMI with the BMI calculator, which accepts kg or lb.
- Travel: airlines may list baggage allowances in kg or lb – always check your airline's own limits.
- Cooking: international recipes often use ounces and pounds.
- Online shopping: product and shipping weights from abroad are often in lb or oz.
Frequently asked questions
How many pounds is 1 kg?
1 kilogram is about 2.20462 pounds.
How do I convert lbs to kg?
Divide the pounds by 2.20462, or multiply by 0.45359237. For example, 150 lb is about 68.0 kg.
How many grams are in an ounce?
One ounce is about 28.35 grams, and there are 16 ounces in a pound.
What is 70 kg in stone?
70 kg is about 11 stone and 0.3 pounds, since one stone is 14 pounds.