Unit Conversion 2026-05-02 4 min read By Konvertibly Team

Stone to Kilograms: Formula, Weight Table and Free Converter

Convert stone to kilograms with the exact formula, a body weight reference from 7 to 20 stone, and why the stone is still used in the UK today.

Stone to Kilograms: The Complete Guide

The stone (st) is a unit of weight equal to 14 pounds or about 6.35 kilograms. It is used almost exclusively in the UK and Ireland for measuring body weight. Almost no other countries use it, making conversion essential for international health records, fitness apps, and medical consultations.

The Conversion Formula

kilograms = stone × 6.35029

Since 1 stone = 14 pounds and 1 pound = 0.453592 kg: 14 × 0.453592 = 6.35029 kg.

Body Weight Reference Table

7 st = 44.45 kg (98 lb)
8 st = 50.80 kg (112 lb)
9 st = 57.15 kg (126 lb)
10 st = 63.50 kg (140 lb)
11 st = 69.85 kg (154 lb)
12 st = 76.20 kg (168 lb)
13 st = 82.55 kg (182 lb)
14 st = 88.90 kg (196 lb)
15 st = 95.25 kg (210 lb)

Mixed Units: Stone and Pounds

UK scales often display "10 st 4 lb". To convert: (10 × 14 + 4) = 144 lb × 0.453592 = 65.32 kg. Always convert the entire measurement before comparing with metric values.

Convert any weight instantly: Free stone to kg converter