Use this converter to switch between kilograms (kg), pounds (lbs), and stone (st + lbs). Enter a value in any section and click convert.
Convert from Kilograms
Convert from Pounds
Convert from Stone + Pounds
Why use a kg to lbs to stone calculator?
Different countries use different weight systems. Most of the world uses kilograms, the United States commonly uses pounds, and the United Kingdom often uses stone and pounds together. If you read fitness plans, medical reports, or international forms, you may need to convert quickly and accurately.
This calculator gives you fast, readable results in all three units so you can compare numbers without manual math.
How the conversion works
Core conversion factors
- 1 kilogram = 2.2046226218 pounds
- 1 stone = 14 pounds
- 1 pound = 0.45359237 kilograms
Formulas used
- kg to lbs: lbs = kg × 2.2046226218
- lbs to kg: kg = lbs ÷ 2.2046226218
- lbs to stone: stone = floor(lbs ÷ 14), remaining lbs = lbs mod 14
- stone + lbs to total lbs: total lbs = (stone × 14) + lbs
Quick reference table
| Kilograms | Pounds | Stone + Pounds |
|---|---|---|
| 50 kg | 110.23 lbs | 7 st 12.23 lbs |
| 60 kg | 132.28 lbs | 9 st 6.28 lbs |
| 70 kg | 154.32 lbs | 11 st 0.32 lbs |
| 80 kg | 176.37 lbs | 12 st 8.37 lbs |
| 90 kg | 198.42 lbs | 14 st 2.42 lbs |
When these conversions are useful
- Tracking weight loss or muscle gain across international apps.
- Understanding medical results from another region.
- Reading sports, boxing, MMA, and lifting weight classes.
- Comparing baggage or shipping limits written in different units.
Common mistakes to avoid
1) Mixing up stone and pounds
“11 stone 4” means 11 stone + 4 pounds, not 11.4 stone. The calculator handles this by using two separate fields.
2) Rounding too early
If you round in the middle of a calculation, final values can drift. This tool calculates with full precision first, then rounds for display.
3) Ignoring decimal pounds
In fitness and clinical data, decimal pounds matter. For example, 154.3 lbs and 154 lbs are not identical when tracking trends over time.
FAQ
Is stone still used today?
Yes. Stone is still widely used in casual body-weight conversations in the UK and Ireland.
Can I enter decimal values?
Yes. All fields accept decimals except the main stone field, which is typically a whole number.
How accurate is this calculator?
It uses standard conversion constants and is suitable for everyday, fitness, and general medical reference use.