How many kilograms are in 1 stone?

1 stone = 6.35029 kg (exact). So 10 stone = 63.50 kg, 12 stone = 76.20 kg, 14 stone = 88.90 kg. Formula: kg = stone × 6.35029. Quick trick: multiply stones by 6.35 for a close estimate. Common in UK & Ireland for body weight. Full chart from 1 – 30 stone below.

Stone to Kg: 1 Stone = 6.35 kg (Full 1

The stone is a British and Irish unit of mass equal to 14 pounds, still widely used to describe body weight in the UK, Ireland and Australia. This chart covers every value from 1 to 30 stone in kilograms, plus the exact formula.

Stone to kg formula

kg = stone × 6.35029. One stone equals exactly 14 lb, and 14 × 0.45359237 = 6.35029 kg.

Quick mental approximation

stone × 6.35 ≈ kg. 12 stone × 6.35 = 76.2 kg. Round to the nearest 0.5 kg for everyday accuracy.

Full 1–30 stone chart

1 st = 6.35 kg · 2 st = 12.70 · 3 st = 19.05 · 4 st = 25.40 · 5 st = 31.75 · 6 st = 38.10 · 7 st = 44.45 · 8 st = 50.80 · 9 st = 57.15 · 10 st = 63.50 · 11 st = 69.85 · 12 st = 76.20 · 13 st = 82.55 · 14 st = 88.90 · 15 st = 95.25 · 16 st = 101.61 · 17 st = 107.96 · 18 st = 114.31 · 19 st = 120.66 · 20 st = 127.01 · 25 st = 158.76 · 30 st = 190.51 kg.

Stones and pounds combined

UK body weight is often given as 'stone-pounds', e.g. 11 st 4 lb. Convert: (11 × 14 + 4) = 158 lb = 71.67 kg. Always convert to total pounds first, then to kg.

Common body weights

10 st (63.5 kg) ≈ average UK woman. 12 st (76.2 kg) ≈ average UK man. 18 st (114 kg) is a typical heavyweight boxing limit.

Reverse: kg to stone

stone = kg ÷ 6.35029. 80 kg ÷ 6.35 = 12.6 stone, which equals 12 st 8.4 lb.

How this guide is researched and fact-checked

This article is produced by the ToolKit Pro Measurement Desk using ai-assisted research with human editorial verification against primary sources, and is checked by a human editor at the ToolKit Pro editorial desk before publication. Every number, formula and threshold quoted here is traced back to a primary standards body or health authority rather than to another blog, and each figure is re-computed with our own calculators so the worked examples and the live tools on this site always agree. When a definition changes — as with the 2019 SI redefinitions — the affected articles are re-checked and the “updated” date above is bumped.

Produced by: ToolKit Pro Measurement Desk — Unit conversion & measurement standards
Method: AI-assisted research, human-verified against primary sources
Reviewed by: ToolKit Pro editorial desk (human review)
Last reviewed: 2026-08-19
Corrections: spotted an error? Tell us and we will fix and re-date the page.

Sources & further reading

BIPM — The International System of Units (SI Brochure)
NIST — Guide for the Use of the International System of Units
WHO — Body weight & health guidance

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Stone to Kg: 1 Stone = 6.35 kg (Full 1–30 st Chart)

Stone → Kg Live Converter