How many kilograms is 1 stone?

1 stone is 6.35 kg, exactly 6.35029318 kg.

What is 11 stone 6 lb in kg?

11 st 6 lb is 160 lb, which is 72.57 kg.

Why does my NHS record show kilograms when I weigh myself in stone?

Clinical systems in the UK use metric units for BMI and dosing, so a weight given in stone is converted to kilograms for the record.

Does 1 stone always equal 14 pounds?

For body weight, yes. Historically some trades used stones of 8 or other numbers of pounds, but those have been out of use for well over a century.

Stone to Kilograms

Multiply stone by 6.35029318 to get kilograms, since one stone is 14 lb and each pound is exactly 0.45359237 kg: 10 st is 63.5 kg and 12 st 7 lb is 79.4 kg. Enter stone below; for a stone-and-pounds weight, add the pounds as a fraction of 14.

Stones to kilograms at a glance

Seven values you meet most often. The tables and the converter handle everything in between.

1 st
6.35029 kg
2 st
12.7006 kg
5 st
31.7515 kg
10 st
63.5029 kg
20 st
127.006 kg
50 st
317.515 kg
100 st
635.029 kg

Converting a weight like 11 st 6 lb

Most stone figures come with pounds attached, and that is where people go wrong. The safest method is to turn everything into pounds first: 11 st 6 lb is 11 × 14 + 6 = 160 lb, and 160 × 0.45359237 is 72.57 kg. Alternatively, write the pounds as a fraction of a stone, 6 ÷ 14 = 0.43, and convert 11.43 st directly.

For a fast estimate, multiply stone by 6.35, or by 6 and add a bit: 13 st is about 78 + 4.6 = 82.6 kg, against the exact 82.55 kg.

When you need kilograms instead

In the UK, the NHS, pharmacies and gyms record weight in kilograms, and BMI is calculated as kilograms divided by height in meters squared. Many British adults know their weight only in stone, so this conversion comes up at every check-up. Drug doses for children and some adults are worked out per kilogram, which is one more reason clinicians insist on the metric figure.

Travel is the other trigger. Airline baggage and small-aircraft passenger limits are set in kilograms almost everywhere except the US, and a kilogram reading avoids any doubt at the desk.

Sanity checks

A stone is a little over six kilograms, so the kilogram figure should be roughly six times the stone figure. If 12 stone comes out at 26 kg, you probably converted pounds to kilograms with the wrong factor or forgot to multiply by 14. Remember too that 11.5 st and 11 st 5 lb are different weights: 73.0 kg against 72.1 kg.

Going the other way, kilograms to stone splits a metric weight back into stone and pounds. The full list of mass units lives in the unit converter.

Frequently asked questions

How many kilograms is 1 stone?: 1 stone is 6.35 kg, exactly 6.35029318 kg.
What is 11 stone 6 lb in kg?: 11 st 6 lb is 160 lb, which is 72.57 kg.
How heavy is 15 stone in kilograms?: 15 stone is 95.25 kg.
Why does my NHS record show kilograms when I weigh myself in stone?: Clinical systems in the UK use metric units for BMI and dosing, so a weight given in stone is converted to kilograms for the record.
Does 1 stone always equal 14 pounds?: For body weight, yes. Historically some trades used stones of 8 or other numbers of pounds, but those have been out of use for well over a century.