Kg to Stones Converter (kg ↔ st lb)
Convert between kilograms and the UK stone-and-pounds system, showing whole stones plus remaining pounds.
Direction
kg
11 st 0.3 lb
- 1
Convert kg to pounds
70 ÷ 0.45359237 = 154.32361 lb = 0.45359237 kg (exact international definition). - 2
Whole stones
floor(154.3236 ÷ 14) = 11 - 3
Decimal stones
70 ÷ 6.35029318 = 11.02
How does this calculator work?
Divide kilograms by 6.35029318 to get stones (one stone = 14 lb = 6.35029318 kg). For "stones and pounds" format, take the whole-number stones and multiply the decimal fraction by 14 for the remaining pounds. Multiply total pounds by 0.45359237 to convert back to kilograms.
Formula
How this is calculated
The stone is a unit of mass still widely used for body weight in the United Kingdom and Ireland. One stone equals exactly 14 avoirdupois pounds, and since one pound equals exactly 0.45359237 kilograms (the 1959 international definition), one stone equals exactly 6.35029318 kg.
To convert kilograms to stones, divide the kilogram value by 6.35029318 to get the decimal number of stones. For the "stones and pounds" reading, take the whole-number stones (floor), then multiply the fractional part by 14 to get the remaining pounds. For example, 70 kg ÷ 6.35029318 = 11.023 st → 11 st 0.3 lb ≈ 11 st.
Going the other way, multiply the whole stones by 14 to get pounds, add any extra pounds, then multiply the total pounds by 0.45359237 to get kilograms. A blank pounds field is treated as zero so you can enter just stones.
Frequently asked questions
One stone equals exactly 6.35029318 kilograms. This follows from the exact definitions: 1 lb = 0.45359237 kg and 1 stone = 14 lb, so 1 stone = 14 × 0.45359237 = 6.35029318 kg.
70 kg ÷ 6.35029318 = 11.023 stones, which is 11 stones 0.3 lb — in everyday rounding, 11 stone.
Yes — stones are still the most common unit for body weight in everyday conversation in the United Kingdom and Ireland, even though kilograms are the official SI unit.
Also known as
TG we-Calculate Editorial Team. (2026). Kg to Stones Converter (kg ↔ st lb) [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/kg-to-stones-converter
TG we-Calculate Editorial Team. "Kg to Stones Converter (kg ↔ st lb)." TG we-Calculate. 2026. https://we-calculate.com/calculator/kg-to-stones-converter.
TG we-Calculate Editorial Team, "Kg to Stones Converter (kg ↔ st lb)," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/kg-to-stones-converter
@misc{wecalculate_kg_to_stones_converter, title = {Kg to Stones Converter (kg ↔ st lb)}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/kg-to-stones-converter}}, year = {2026}, note = {TG we-Calculate} }
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