Stone to kg: Convert Stones to Kilograms

Why Stones to kg Comes Up

In the UK and Ireland, adult body weight is still spoken of in stones, but scales, gym equipment, and medical records increasingly show kilograms. Moving between the two is a daily need for anyone tracking weight across systems.

One stone equals 6.35029318 kg. Our stone to kg converter does the math both ways; the factor below is handy for quick estimates.

The Stone to kg Formula

One stone is defined as exactly 6.35029318 kilograms (14 pounds). To convert stones to kilograms, multiply the stone value by 6.35029318.

What the Numbers Look Like

Common body weights: 10 stone = 63.5 kg, 12 stone = 76.2 kg, 14 stone = 88.9 kg. UK charts often split the remainder into pounds, so 12 st 5 lb means 12 stone plus 5 pounds, or about 78.2 kg.

If you only know your weight in stones, multiplying by 6.35 gives the kilogram figure most apps and scales expect. The reverse is in our kg to stone guide.

Stone to kg Compared With Nearby Values

Reference points: 8 stone = 50.8 kg, 9 stone = 57.2 kg, 11 stone = 69.9 kg. Each stone adds a steady 6.35 kg, so the metric number climbs predictably.

For typical adult weights, the stone figure of 8-16 st maps to about 51-102 kg on metric scales.

When You Need Stones in kg

The conversion matters for health tracking. A UK weight of 13 stone is 82.55 kg, the number a metric fitness app wants. Diet plans, BMI calculators, and pharmacy scales usually expect kilograms.

It also helps when reading international health advice that quotes metric weights while your own records use stones.