Weight Converter

Converting weight in the UK

Britain weighs itself in stones and pounds, buys food in kilograms and grams, and sees American recipes and gym plates in pounds alone. This converter bridges all four. The key factors are exact: 1 stone = 14 pounds = 6.35029 kg, and 1 pound = 0.453592 kg.

💡 Quick answer

To convert stones and pounds to kg: turn it all into pounds (stones × 14 + pounds), then multiply by 0.453592. So 11 st = 154 lb × 0.453592 = 69.85 kg. To go back, divide kg by 6.35029 for stones and read the remainder as pounds.

Stones and pounds to kilograms

Stones & pounds	Kilograms
8 st 0 lb	50.8 kg
10 st 0 lb	63.5 kg
11 st 0 lb	69.9 kg
12 st 7 lb	79.4 kg
14 st 0 lb	88.9 kg
16 st 0 lb	101.6 kg

Based on 1 stone = 6.35029 kg. Useful for reading UK body weights in metric for health forms.

Weight and BMI

You need your weight in kilograms to work out BMI, so this converter is a handy first step if you weigh yourself in stones. For a dedicated stone-to-kilogram tool see our stone to kg converter, and for height try the height converter.

Reviewed by Mustafa Bilgic

Founder, Calcu · Consumer-finance tools

"The UK weighs in stones, the world in kilos, and the gym in pounds — so we cover all four in one place. We use the exact 6.35029 kg per stone factor, so health-form conversions match what a clinic would record."

Frequently asked questions

How do I convert stones to kg?

Convert to pounds first (stones × 14, plus any extra pounds), then multiply by 0.453592. For example, 11 stone is 154 pounds × 0.453592 = 69.85 kg. Or multiply whole stones by 6.35029 directly.

How many kg is 11 stone?

11 stone is about 69.85 kg. Each stone is 6.35029 kg, so 11 × 6.35029 = 69.85 kg.

How do I convert kg to stones and pounds?

Divide the kilograms by 6.35029 to get stones; the whole number is the stones, and multiply the decimal part by 14 to get the remaining pounds. For example, 70 kg = 11 st 0.2 lb.

How many pounds in a stone?

There are exactly 14 pounds in one stone. So 10 stone is 140 pounds, and 12 st 7 lb is 175 pounds.

Are these weight conversions exact?

Yes. They use the internationally defined values: 1 pound = 0.45359237 kg and 1 stone = 14 pounds = 6.35029318 kg, so the conversions are exact rather than approximate.