Pounds to Stone Converter (lb to st)

American weights are given in pounds alone, so a US medical form, a product listing or a fighter's weigh-in can look unfamiliar to someone in the UK or Ireland who pictures body weight in stone. Dividing by 14 converts pounds to stone, and whatever is left after the whole stones is the pounds part.

The first chart steps through adult weights from 100 to 300 lb, mostly in 5 lb steps, and shows each one both as decimal stone and as stones and pounds. The second chart lists whole stone values for checking the other way. The stones-and-pounds column rounds the leftover pounds to one decimal place, so it can be copied straight onto a UK form.

How to use this tool

1. Type a value in the Pound box to see it in stone, or type in the Stone box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Weight & Mass converter.

Formula

Stone (st) = Pound (lb) × 0.0714285714286

Pound (lb) = Stone (st) × 14

Both factors come from exact definitions: 1 stone = 14 pounds and 1 pound = 0.0714285714286 stone (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

185 lb × 0.0714285714286 ≈ 13.2143 st

13 st × 14 = 182 lb

Pound to Stone chart

Common values from pounds to stone, rounded to four decimal places.

Stone to Pound chart

The reverse direction for values people often look up.

MMA weight-class limits in pounds

Quick mental estimate

Halve the pounds, then divide by 7: 168 lb → 84 → 12 st. When the division is not exact, take out whole 14s and keep the rest as pounds; for 185 lb, 13 × 14 = 182, leaving 13 st 3 lb. The method is exact.

Use the converter or the charts when the exact figure matters.

The two units

Pound (lb): The avoirdupois pound has been defined since 1959 as exactly 0.45359237 kilograms and is divided into 16 ounces. It is the everyday unit of weight in the US.

Stone (st): A stone is 14 pounds, exactly 6.35029318 kilograms. In the UK and Ireland body weight is still commonly given in stone and pounds, such as 11 st 4 lb.