Stone to KG Converter
The UK body-weight unit into metric — exact, with the st-and-lb form.
Type in either field — the other updates instantly.
Stone to KG chart
| Stone | Kilograms |
|---|---|
| 7 st | 44.45 kg |
| 8 st | 50.8 kg |
| 9 st | 57.15 kg |
| 10 st | 63.5 kg |
| 11 st | 69.85 kg |
| 12 st | 76.2 kg |
| 13 st | 82.55 kg |
| 14 st | 88.9 kg |
| 15 st | 95.25 kg |
| 16 st | 101.6 kg |
| 18 st | 114.31 kg |
| 20 st | 127.01 kg |
| 25 st | 158.76 kg |
The 8–16 stone band covers most adult body weights (50.8–101.6 kg).
How this is calculated
kg = stone × 6.35029318 (exact — 14 lb per stone)
Stone is how bodies are weighed in the UK and Ireland: 11 stone is 69.85 kg, “12 st 7” (12 stone 7 pounds) is 79.38 kg. One stone is 14 pounds exactly, so the factor inherits the pound’s exact definition. Convert mixed stone-and-pound weights by adding pounds ÷ 14 first.
Exact: 14 × 0.45359237 kg = 6.35029318 kg per stone. Medical UK practice now records kilograms, but scales, gyms, and conversation still speak stone — this page is the translator.
Frequently asked questions
How many kg is 1 stone?
6.35 kg exactly (6.35029318). Ten stone — a common reference weight — is 63.5 kg.
What is 12 st 7 lb in kg?
Add the pounds as a fraction of a stone: 12 + 7⁄14 = 12.5 st, × 6.3503 = 79.38 kg. The half-stone trick works for any “st X” form.
Why do only Britain and Ireland use stone?
The stone survived in body weight after metrication removed it from trade in 1985. The US never adopted it (Americans weigh in pounds); the Commonwealth largely metricated it away.
How do I go from kg back to stone?
Divide by 6.35029318, then split the remainder ×14 into pounds: 85 kg = 13.39 st = 13 st 5.4 lb. The companion page does it live.