# How to convert kg to stone?

Converts kilograms (kg) to stone (st) and back, with the exact unit definitions.

- Page: https://www.acalculator.org/convert/kg-to-stone
- JSON spec: https://www.acalculator.org/convert/kg-to-stone.json
- Version: e4675d9d0bb0

## Default answer

Example with the default inputs (Kilograms (kg) 1): 1 kg = 0.157473 st (0 st 2.2 lb).

## Inputs

| Key | Label | Description |
| --- | --- | --- |
| value | Kilograms (kg) | The amount in kilograms to convert. |
| result | Stone (st) | The same amount in stone. |

## Outputs

| Key | Label | Description |
| --- | --- | --- |
| value | Kilograms (kg) | The amount in kilograms to convert. |
| result | Stone (st) | The amount in stone. |
| hm | Stone and pounds | Whole stone and the pounds left over, to 0.01 lb. |

## Method

st = kg × 0.157473044418 (the same as kg ÷ 6.35029318)

## Assumptions

- 1 kilogram = 0.157473044418 stone, from the exact definitions in NIST SP 811.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up.
- Stone and pounds use the box you typed; pounds round half up to 0.01, and 14.00 carries.

## Worked examples

1. value = 1 gives result = 0.157473. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
2. value = 63.502932 gives result = 10. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.
3. result = 10 gives value = 63.502932. Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8.

## FAQ

### How many stone are in a kilogram?

1 kilogram is 0.157473 stone, from the exact unit definitions (NIST SP 811).

### How do I convert kg to stone?

Multiply by 0.157473: st = kg × 0.157473044418 (the same as kg ÷ 6.35029318). For example, 1 kg × 0.157473 = 0.157473 st.

### How do I convert stone back to kg?

Multiply by 6.350293, or type the stone into the second box and the converter works it out. 1 stone is 6.350293 kilograms.

### How many pounds are in a stone?

14 (NIST Handbook 44). A pound is exactly 0.45359237 kg, so a stone is 14 × 0.45359237 = 6.35029318 kg.

### What is 70 kg in stone and pounds?

70 kg is 154.3236 lb (70 ÷ 0.45359237). 154.3236 ÷ 14 is 11 whole stone with 0.32 lb left over, so 11 st 0.32 lb, or 11.023113 stone.

### Where is the stone used?

Mostly in the UK and Ireland, for body weight. It is not a US unit: US scales show pounds.

## Sources

- NIST SP 811 (2008), Guide for the Use of the International System of Units, Table 5 (SI prefixes) and Appendix B.8 (factors for units listed alphabetically), retrieved 2026-10-05. https://www.nist.gov/pml/special-publication-811
- NIST Handbook 44 (2026), Appendix C, General Tables of Units of Measurement: British avoirdupois units, 14 pounds = 1 stone, retrieved 2026-10-05. https://www.nist.gov/document/2026-nist-handbook-44-appendix-c