What this conversion means in practice
Stone is still how many people in the UK and Ireland talk about body weight, but databases and US forms want pounds—or the other way around. One stone is exactly fourteen avoirdupois pounds.
One hundred fifty-four pounds is eleven stone exactly (154 ÷ 14). Mixed displays like “11 st 4 lb” mean eleven stone plus four extra pounds, not 11.4 stone.
Convert the full pound total first, then split into st + remainder lb if you are formatting for local speech.
How to convert pound to stone
Multiply the pound value by 0.071428571429 to get stone.
Example: 154 lbs × 0.071428571429 = 11 st
Pound
Definition: The international avoirdupois pound (lb) is defined exactly as 0.45359237 kilograms. One pound equals exactly 16 avoirdupois ounces.
History and origin: The modern pound descends from the Roman libra through many regional variants. In 1959, English-speaking countries agreed on the exact kilogram definition used today, standardizing trade and engineering calculations.
Current use: Pounds are widely used in the United States for body weight, groceries, and household measurements. They also remain visible in UK labeling and in global contexts where US customary units are common.
Stone
Definition: A stone (st) is a British imperial unit equal to exactly 14 pounds, or 6.35029318 kilograms.
History and origin: Stone once varied by commodity and region in Britain. Over time, legal and commercial standards fixed it at 14 pounds for consistent measurement.
Current use: Stone is still commonly used in the UK and Ireland for body weight, often alongside pounds (for example, 11 st 4 lb).
Pound to Stone conversion table
| Pound (lbs) | Stone (st) |
|---|---|
| 0.1 lbs | 0.0071428571 st |
| 1 lbs | 0.0714285714 st |
| 2 lbs | 0.1428571429 st |
| 3 lbs | 0.2142857143 st |
| 5 lbs | 0.3571428571 st |
| 10 lbs | 0.7142857143 st |
| 20 lbs | 1.4285714286 st |
| 50 lbs | 3.5714285714 st |
| 100 lbs | 7.1428571429 st |
| 1,000 lbs | 71.4285714286 st |
Pound to Stone FAQ
lb to st for UK fitness apps, medical intake, and wrestling weight classes.
How many stone is 200 lb?
About 14.29 st (200 ÷ 14). For display, many people prefer “14 st 4 lb” instead of decimals.
Is stone the same everywhere?
This page uses the UK stone = 14 lb. Historical stones varied by commodity; modern body weight uses fourteen.
Decimal stone vs st+lb?
Decimal stone is fine for math; UI copy often shows whole stone plus leftover pounds for readability.