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Pounds to Stones Converter

Convert pounds to UK stones, kilograms, and combined stone-and-pound notation (11 st 4 lb). Pounds-first input direction with body-weight context and the UK vs US clinical convention.

Pounds to Stones Converter

158 lb equals

11 st 4 lb

Also 11.2857 st (decimal) or 71.67 kg

Total pounds

158.00 lb

Stones and pounds

11 st 4 lb

Stones (decimal)

11.2857 st

Kilograms

71.6676 kg

Body weight context. Adult average US male 197 lb / 14 st 1 lb. This input 39 lb below the average.

UK vs US notation. UK clinical practice records body weight in stones and pounds (for example 11 st 4 lb). US clinical practice uses pounds alone (158 lb). Both refer to the same weight, only the notation differs.

This converter does not take a height, so it cannot compute BMI. Pair the kg figure with a height in meters to calculate it.

Quick reference (pounds to stones and kg)

100 lb7 st 2 lb (45.36 kg)
120 lb8 st 8 lb (54.43 kg)
140 lb10 st 0 lb (63.5 kg)
150 lb10 st 10 lb (68.04 kg)
160 lb11 st 6 lb (72.57 kg)
170 lb12 st 2 lb (77.11 kg)
180 lb12 st 12 lb (81.65 kg)
190 lb13 st 8 lb (86.18 kg)
200 lb14 st 4 lb (90.72 kg)
220 lb15 st 10 lb (99.79 kg)
250 lb17 st 12 lb (113.4 kg)
300 lb21 st 6 lb (136.08 kg)

Formula: 1 stone equals exactly 14 lb (UK 1835 Weights and Measures Act), and 1 lb equals 0.45359237 kg (1959 international yard and pound agreement). Everything here derives from those two constants.

Frequently Asked Questions about the Pounds to Stones Converter

How many stones are in a pound?
One pound equals exactly 1/14 of a stone, because a stone has been fixed at 14 pounds since the UK 1835 Weights and Measures Act. That act ended centuries of regional variation (wool stones, cheese stones, butcher's stones all had different values from 5 to 24 lb) by making the 14 lb wool stone the only legal stone for trade. So to go from pounds to stones, divide by 14: 158 lb / 14 = 11.2857 st, or 11 st 4 lb in the combined form.
Why does the UK still use stones for body weight?
Stones and pounds remain familiar for personal body weight in everyday conversation in the UK and Ireland. Clinical records and medication calculations generally use kilograms, though scales may display both systems. The stone is no longer a legal unit for trade in the UK.
How do I read stone-and-pound notation like 11 st 4 lb?
Whole stones come first, leftover pounds second, and the pounds remainder is always under 14 (otherwise you would carry a full stone). 11 st 4 lb means 11 times 14 plus 4 equals 158 pounds, or 71.7 kg. A reading of "10 st 14 lb" would not appear in practice because it equals 11 st 0 lb. This converter rejects a remainder at or above 14 to keep the notation canonical.
What is the average UK male body weight in stones?
The Health Survey for England reports an average adult male weight around 13.5 stones (about 189 lb or 86 kg). Average adult female weight is around 11.2 stones (about 156 lb or 71 kg). These have risen by roughly one stone since the 1990s. By comparison, the US CDC NHANES survey gives the average adult male weight as 197 lb (14 st 1 lb) and the average adult female weight as 170 lb (12 st 2 lb).
How many kilograms in a stone or pound?
One pound equals exactly 0.45359237 kg by the 1959 international yard and pound agreement. One stone equals 14 of those pounds, so 6.35029318 kg exactly. The kilogram is the international SI unit and the only weight unit used in scientific, medical, and most non-English-speaking contexts worldwide. For mental math, treat a stone as 6.35 kg, so 10 stones is about 63.5 kg and 12 stones is about 76.2 kg.

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