Stone to Kilograms

1 st = 6.350293 kg

Stone to kilograms is used mostly by people in the United Kingdom and Ireland, where body weight is still commonly given in stone and pounds. Gyms, doctors, and international forms often require kilograms instead. One stone equals exactly 14 pounds, which is exactly 6.35029318 kg.

From

When you need to convert stone to kilograms

Entering a body weight known in stone on a medical or fitness app set to kilograms
Comparing a UK weight-loss goal with a metric diet plan
Converting jockey or boxer weights described in stone
Filling in travel or insurance forms that require kilograms

How to convert stone to kilograms

kg = st × 6.350293

Example: 5 st = 31.75147 kg

Common body weights in stone

Stone (st)	Kilograms (kg)
8 st	50.80235 kg
9 st	57.15264 kg
10 st	63.50293 kg
11 st	69.85322 kg
12 st	76.20352 kg
13 st	82.55381 kg
14 st	88.9041 kg
15 st	95.2544 kg
16 st	101.6047 kg
18 st	114.3053 kg

Tips for converting stone to kilograms

Multiply stone by 6.35, or by 6.4 for mental math. The rounded factor is within about 1% of the exact value.
A weight like 11 st 6 lb is not 11.6 st. Convert the stone and the extra pounds separately and add them.
For extra pounds, each pound is about 0.45 kg, which keeps the add-on step simple.

Stone to Kilograms conversion table

Stone (st)	Kilograms (kg)
1 st	6.350293 kg
2 st	12.70059 kg
3 st	19.05088 kg
4 st	25.40117 kg
5 st	31.75147 kg
6 st	38.10176 kg
7 st	44.45205 kg
8 st	50.80235 kg
9 st	57.15264 kg
10 st	63.50293 kg
15 st	95.2544 kg
20 st	127.0059 kg
25 st	158.7573 kg
30 st	190.5088 kg
40 st	254.0117 kg
50 st	317.5147 kg
75 st	476.272 kg
100 st	635.0293 kg
250 st	1,587.573 kg
500 st	3,175.147 kg
1,000 st	6,350.293 kg

About the units

Stone: The stone is a British unit of mass equal to 14 pounds, or about 6.35 kilograms, still used for body weight in the UK and Ireland.

Kilograms: The kilogram is the SI base unit of mass, defined through the Planck constant. It is the everyday unit for body weight and groceries in most countries.

Frequently asked questions

How many kilograms are in 1 stone?

1 stone equals 6.350293 kilograms.

How many stone are in 1 kilogram?

1 kilogram equals 0.157473 stone.

How do I convert stone to kilograms?

Use the formula kg = st × 6.350293.

What is 10 stone in kilograms?

10 stone equals 63.50293 kilograms.

Related conversions

Sources

Conversion factors use the exact definitions published by NIST and the BIPM, and are checked by automated tests against those definitions.

Last updated: October 17, 2026