Stones to kg Converter

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Convert stones to kilograms at the exact rate 1 stone = 14 lb = 6.35029318 kg. A 10-stone person is 63.50 kg; a 12-stone person is 76.20 kg; a 14-stone person is 88.90 kg. Most useful for converting UK personal body weight into kg for medical forms, fitness apps and BMI calculators that expect metric input. Browser-local conversion.

Stone (st)
Kilogram (kg)

Stone (st) ā†’ Kilogram (kg)

Quick reference table

Stone (st)Kilogram (kg)
1 stone6.3503 kg
2 stone12.7006 kg
5 stone31.7515 kg
10 stone63.5029 kg
25 stone158.7573 kg
50 stone317.5147 kg
100 stone635.0293 kg

Glossary

Stone (st)

A stone is exactly 14 pounds or 6.35029318 kg, used in the United Kingdom and Ireland for personal body weight (e.g. "11 st 4 lb"). It is rarely used in the United States, where pounds are reported directly. The stone is not used in scientific or commercial weighing ā€” only in everyday colloquial body-weight reporting.

Kilogram (kg)

The kilogram is the SI base unit of mass, redefined in 2019 in terms of the Planck constant (h = 6.62607015Ɨ10ā»Ā³ā“ JĀ·s). One kilogram equals 1000 g, 2.20462 lb or 0.157 stone. It anchors all other metric mass units and is the standard for body weight, groceries, freight and scientific work in nearly every country.

Metric system (SI)

The metric system is a decimal system of measurement built around the kilogram for mass, the meter for length and the second for time, with multiples and submultiples expressed as powers of ten (milligram, gram, tonne). Adopted in France in 1799 and codified internationally as the International System of Units (SI) in 1960, it is now the official system in nearly every country and the standard in science.

Imperial / US Customary system

The imperial system is the historical English system of weights and measures whose mass units are the ounce, pound, stone and ton (16 oz = 1 lb, 14 lb = 1 stone, 2,000 lb = 1 US short ton). Codified by the British Weights and Measures Act of 1824 and aligned with US Customary by the 1959 international yard-and-pound agreement (1 lb = 0.45359237 kg exactly), it is still used in the United States and the United Kingdom for everyday weights.

Related tools

Kilograms to Stones
Convert kilograms to stones ā€” 1 kg = 0.1574 st (1 st = 6.3503 kg)
Stones to Pounds
Convert stones to pounds ā€” 1 stone = 14 lb
Pounds to Kilograms
Convert pounds to kilograms ā€” exact factor 1 lb = 0.4536 kg
Weight & Mass Converter
Convert weight and mass ā€” mg, g, kg, tonnes, ounces, pounds, stones, US tons