Kg to Lbs Converter
Convert kilograms to pounds or pounds to kilograms with the exact defined factor — plus stones and pounds for UK-style body weight.
How to use this calculator
- Enter the weight in kg or lbs.
- Pick the direction of conversion.
- Press Convert — stones + pounds included for UK contexts.
Formula used
The pound is defined as exactly 0.45359237 kg, so 1 kg = 2.2046226 lb. Mental shortcut: double the kg and add 10%.
Example calculation
Convert 70 kg: 70 ÷ 0.45359 = 154.32 lb, which is 11 stone 0.3 lb. In reverse, 150 lb = 68.04 kg.
The kg–lb conversion
Body weight, gym plates, luggage allowances and package shipping all cross between kilograms and pounds daily. The relationship has been exact since 1959: 1 lb = 0.45359237 kg precisely.
Useful anchors: 5 kg ≈ 11 lb, 10 kg ≈ 22 lb, 23 kg (typical airline checked-bag limit) ≈ 50.7 lb, and gym plates: a 20 kg plate is 44 lb while the US-standard 45 lb plate is 20.4 kg.
Why use this calculator?
- Convert body weight for fitness apps, medical forms and sports.
- Check luggage against airline limits quoted in either unit.
- Stones included — the format UK scales and doctors actually use.
Frequently asked questions
What is 70 kg in pounds?
154.32 lb (70 ÷ 0.45359). Quick estimate: 70 × 2 = 140, plus 10% = 154.
How many kg is 150 pounds?
68.04 kg (150 × 0.45359). Rough rule: halve the pounds and subtract 10% of that — 75 − 7 ≈ 68.
How do stones work?
1 stone = 14 lb = 6.35 kg. UK body weights read like "11 st 4 lb" — that's 158 lb or 71.7 kg.