Pound to Stone (lb to st)
Result
0.07142857143 Stone
Formula
st = lb × 0.07142857143
1 lb = 0.07142857143 st, and 1 st = 14 lb.
The kilogram is the SI base unit of mass, defined through the Planck constant since 2019. The international avoirdupois pound is exactly 0.45359237 kg; the ounce is 1/16 lb and the stone 14 lb.
Worked examples
- 1 lb × 0.07142857143 = 0.071428571 st
- 10 lb × 0.07142857143 = 0.71428571 st
- 100 lb × 0.07142857143 = 7.1428571 st
Common mistakes
- Precious metals use the troy ounce (31.1034768 g), about 10% heavier than the avoirdupois ounce (28.349523125 g) used for food and parcels.
- "Ton" is ambiguous: the metric tonne used here is 1,000 kg, the US short ton 907.18474 kg and the UK long ton 1,016.0469088 kg.
- Kilograms and pounds measure mass. Pound-force (lbf) and newtons measure force — they are not interchangeable with kg.
Pound to Stone table
| Pound (lb) | Stone (st) |
|---|---|
| 1 | 0.071428571 |
| 2 | 0.14285714 |
| 5 | 0.35714286 |
| 10 | 0.71428571 |
| 20 | 1.4285714 |
| 50 | 3.5714286 |
| 100 | 7.1428571 |
| 1,000 | 71.428571 |
The units
- Pound (lb)
- The international avoirdupois pound, exactly 0.45359237 kg.
- Stone (st)
- 14 pounds, exactly 6.35029318 kg. Used for body weight in the UK and Ireland.
Sources for these factors
- The International System of Units (SI Brochure), 9th edition — BIPM
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy