mass conversion
Convert Stone to Kilograms
One stone equals 6.3503 kilograms. Enter any value below for an exact conversion.
How to convert Stone to Kilograms
- Type the number of stone into the first field.
- The equivalent in kilograms appears immediately.
- Swap the units to convert in the opposite direction.
Stone to Kilograms formula
kg = st × 6.3503
Worked example: to convert 12 st, multiply 12 × 6.3503 = 76.2035 kg.
This conversion factor is exact by international definition rather than measured, so the only rounding is whatever you apply to the final answer.
Stone to Kilograms conversion table
| Stone | Kilograms |
|---|---|
| 1 st | 6.3503 kg |
| 2 st | 12.7006 kg |
| 5 st | 31.7515 kg |
| 10 st | 63.5029 kg |
| 25 st | 158.76 kg |
| 50 st | 317.51 kg |
| 100 st | 635.03 kg |
What is a stone?
Fourteen pounds. Still the standard way body weight is stated in the UK and Ireland, and almost unknown in North America.
What is a kilogram?
The kilogram is the SI base unit of mass. Since 2019 it has been defined by fixing the Planck constant, replacing the platinum-iridium cylinder held near Paris since 1889.
Frequently asked questions
How many kilograms are in a stone?
One stone is 6.3503 kilograms.
How do I convert stone to kilograms in my head?
Multiply by 6 and add 6%. 11 st → 66 + 4 = 70 kg.
Is the conversion exact?
Yes. Both units are defined in terms of each other by international agreement, so the factor 6.3503 is exact rather than approximate.
How many stone is 100 kg?
100 kg is 15.7473 st.
Which countries use kilograms?
Every country except the United States, Liberia and Myanmar uses kilograms as the primary unit of mass.
Is my data uploaded to convert it?
No. The arithmetic runs in your browser. Nothing is sent anywhere.