# Kilograms to Stone (kg to st)

> Convert kilograms to stone: 1 kg = 0.157473 st. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `kg-to-stone` · Quantity: Mass (`mass`, base unit kg) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/kg-to-stone · This document: https://tttkmbb.com/conversion/kg-to-stone.md · JSON: https://tttkmbb.com/conversion/kg-to-stone.json (add `?value=` for a result)

## Formula

- `1 kg = 0.157473 st`
- `stone = kilograms × 0.1574730444`
- Reverse: `kilograms = stone × 6.35029318`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 kg = 0.787365 st
- 12.5 kg = 1.96841 st
- 100 kg = 15.7473 st

## Conversion table

| Kilograms (kg) | Stone (st) |
| --- | --- |
| 1 | 0.157473 |
| 2 | 0.314946 |
| 3 | 0.472419 |
| 4 | 0.629892 |
| 5 | 0.787365 |
| 6 | 0.944838 |
| 7 | 1.10231 |
| 8 | 1.25978 |
| 9 | 1.41726 |
| 10 | 1.57473 |
| 15 | 2.3621 |
| 20 | 3.14946 |
| 25 | 3.93683 |
| 30 | 4.72419 |
| 40 | 6.29892 |
| 50 | 7.87365 |
| 75 | 11.8105 |
| 100 | 15.7473 |
| 200 | 31.4946 |
| 250 | 39.3683 |
| 500 | 78.7365 |
| 1000 | 157.473 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=kg&to_unit=st` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"kg","to_unit":"st"}`
- All mass units: https://tttkmbb.com/api/v1/units?quantity=mass · full converter: [Mass / Weight Converter](https://tttkmbb.com/conversion/mass.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many stone are in one kilogram?**

1 kg = 0.157473 st. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

**What is the formula to convert kilograms to stone?**

Multiply the value in kilograms by 0.1574730444: stone = kilograms × 0.1574730444. For example, 5 kg = 0.787365 st.

**How do I convert stone back to kilograms?**

Multiply by the inverse factor 6.35029318 (kilograms = stone × 6.35029318), or use the stone-to-kilograms page.

## Related conversions

- [Stone to kilograms](https://tttkmbb.com/conversion/stone-to-kg.md) (reverse)
- [Kilograms to Pounds](https://tttkmbb.com/conversion/kg-to-lbs.md)
- [Pounds to Kilograms](https://tttkmbb.com/conversion/lbs-to-kg.md)
- [Grams to Ounces](https://tttkmbb.com/conversion/grams-to-oz.md)
- [Ounces to Grams](https://tttkmbb.com/conversion/oz-to-grams.md)
- [Pounds to Ounces](https://tttkmbb.com/conversion/lbs-to-oz.md)
- [Ounces to Pounds](https://tttkmbb.com/conversion/oz-to-lbs.md)
- [Kilograms to Grams](https://tttkmbb.com/conversion/kg-to-grams.md)
- [Grams to Kilograms](https://tttkmbb.com/conversion/grams-to-kg.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)