Convert stone to kg

One stone equals 6.350293 kilograms. To convert any number of stones to kilograms, multiply by 6.35029318.

The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.

Weight and mass conversions matter most in three places: shipping, where a rate band can turn on a single kilogram; cooking, where recipes cross between metric grams and imperial ounces; and personal weight, where Britain and Ireland use stones, the United States uses pounds, and everywhere else uses kilograms. Strictly these are mass units rather than weight units, and the distinction only bites in physics, where weight is a force measured in newtons.

stone to kg formula

To go the other way, use stone = kilogram ÷ 6.35029318.

About these units

The stone equals 14 pounds and remains in everyday use for body weight in Britain and Ireland, while being essentially unknown elsewhere.

Since 2019 the kilogram has been defined by the Planck constant rather than a metal cylinder in Paris, making it reproducible in any properly equipped laboratory.

Stone is also written stones. Kilogram is also written kilogramme, kilogrammes, kilograms, kilos, kilo and kgs.

Sources

1. National Bureau of Standards, "Refinement of Values for the Yard and the Pound", Federal Register, 1 July 1959 — the international yard as exactly 0.9144 m and the avoirdupois pound as exactly 0.45359237 kg.