Pounds to Stones Mass Converter
Common Conversions
| lb | st |
|---|---|
| 7 | 0.5 |
| 14 | 1 |
| 28 | 2 |
| 70 | 5 |
| 100 | 7.143 |
| 140 | 10 |
| 168 | 12 |
| 200 | 14.286 |
| 250 | 17.857 |
| 300 | 21.429 |
Why this conversion matters in chemistry
Cross-region clinical-trial reporting is a place this matters. A 196 lb participant on a US-origin eCRF is exactly 14 stone on the UK PI-facing summary report. The conversion is ordinary unit work in any global clinical-study harmonization that needs both US-customary lb and UK-conventional stone reporting in parallel ICH E3 narratives. The ratio of 1/14 st per lb comes from the legal UK definition of the stone as exactly 14 lb, fixed by the 1985 Weights and Measures Act.
Formula
st = lb ÷ 14
Worked Examples
14 lb = 1 st
The conversion anchor — exactly one stone.
154 lb = 11 st
A typical adult body weight in stones.
200 lb = 14.286 st
About 14 stone 4 pounds — useful as a non-integer example.
Frequently Asked Questions
How do I convert pounds to stones?
Divide by 14. So 154 lb becomes exactly 11 stone. The relationship is exact through the UK legal definition of the stone.
How do I express the result as stones and pounds?
Divide pounds by 14 — the whole number is the stones; multiply the decimal remainder by 14 for the leftover pounds. Example: 185 lb ÷ 14 = 13.21 st = 13 stone 3 lb.
What's the origin of the pound?
The avoirdupois pound (used in both US and UK systems) was standardized at exactly 0.45359237 kg by international agreement in 1959. It descends from medieval trade weights used across Europe.