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Pounds to Stone (lb to st)
Convert pounds to stone: 1 lb = 0.0714286 st. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 lb = 0.0714286 st
stone = pounds × 0.07142857143 — reverse: pounds = stone × 14
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 lb = 0.357143 st
- 12.5 lb = 0.892857 st
- 100 lb = 7.14286 st
Pounds to stone conversion table
| Pounds (lb) | Stone (st) |
|---|---|
| 1 | 0.0714286 |
| 2 | 0.142857 |
| 3 | 0.214286 |
| 4 | 0.285714 |
| 5 | 0.357143 |
| 6 | 0.428571 |
| 7 | 0.5 |
| 8 | 0.571429 |
| 9 | 0.642857 |
| 10 | 0.714286 |
| 15 | 1.07143 |
| 20 | 1.42857 |
| 25 | 1.78571 |
| 30 | 2.14286 |
| 40 | 2.85714 |
| 50 | 3.57143 |
| 75 | 5.35714 |
| 100 | 7.14286 |
| 200 | 14.2857 |
| 250 | 17.8571 |
| 500 | 35.7143 |
| 1000 | 71.4286 |
FAQ
How many stone are in one pound?
1 lb = 0.0714286 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 pounds to stone?
Multiply the value in pounds by 0.07142857143: stone = pounds × 0.07142857143. For example, 5 lb = 0.357143 st.
How do I convert stone back to pounds?
Multiply by the inverse factor 14 (pounds = stone × 14), or use the stone-to-pounds page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=lb&to_unit=st - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"lb","to_unit":"st"} - Markdown: https://tttkmbb.com/conversion/lbs-to-stone.md · JSON: https://tttkmbb.com/conversion/lbs-to-stone.json (add
?value=for a result) · Units: /api/v1/units?quantity=mass - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.