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Stone to Kilograms (st to kg)
Convert stone to kilograms: 1 st = 6.35029 kg. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 st = 6.35029 kg
kilograms = stone × 6.35029318 — reverse: stone = kilograms × 0.1574730444
The factor is derived from the SI definitions of both units (base unit: kg) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 st = 31.7515 kg
- 12.5 st = 79.3787 kg
- 100 st = 635.029 kg
Stone to kilograms conversion table
| Stone (st) | Kilograms (kg) |
|---|---|
| 1 | 6.35029 |
| 2 | 12.7006 |
| 3 | 19.0509 |
| 4 | 25.4012 |
| 5 | 31.7515 |
| 6 | 38.1018 |
| 7 | 44.4521 |
| 8 | 50.8023 |
| 9 | 57.1526 |
| 10 | 63.5029 |
| 15 | 95.2544 |
| 20 | 127.006 |
| 25 | 158.757 |
| 30 | 190.509 |
| 40 | 254.012 |
| 50 | 317.515 |
| 75 | 476.272 |
| 100 | 635.029 |
| 200 | 1270.06 |
| 250 | 1587.57 |
| 500 | 3175.15 |
| 1000 | 6350.29 |
FAQ
How many kilograms are in one stone?
1 st = 6.35029 kg. 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 stone to kilograms?
Multiply the value in stone by 6.35029318: kilograms = stone × 6.35029318. For example, 5 st = 31.7515 kg.
How do I convert kilograms back to stone?
Multiply by the inverse factor 0.1574730444 (stone = kilograms × 0.1574730444), or use the kilograms-to-stone page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=st&to_unit=kg - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"st","to_unit":"kg"} - Markdown: https://tttkmbb.com/conversion/stone-to-kg.md · JSON: https://tttkmbb.com/conversion/stone-to-kg.json (add
?value=for a result) · Units: /api/v1/units?quantity=mass - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.