How many pounds are in one stone?

There are exactly 14 pounds in one stone. This is fixed by definition — no rounding or approximation is involved.

How do I convert stone to pounds?

Multiply the number of stone by 14. For example, 11 st is 11 x 14 = 154 lb, and 13 st 6 lb is (13 x 14) + 6 = 188 lb.

How do I convert pounds back to stone?

Divide the pounds by 14. The whole-number part is the stone, and the remainder is the leftover pounds. For example, 165 lb / 14 = 11 st with a remainder of 11, so 165 lb = 11 st 11 lb.

Where does the 14 pounds per stone come from?

The stone as a unit of 14 pounds was standardised in England in 1835 (Weights and Measures Act), though the value had been in informal use for centuries. Before standardisation different trades used different stone values (e.g. 8 lb for meat, 16 lb for wool). The modern stone of 14 lb is therefore a defined, exact whole number with no decimal component.

Which countries still use stone for body weight?

Stone is used almost exclusively in the United Kingdom and Ireland for expressing personal body weight. Most other English-speaking countries (USA, Canada, Australia) use pounds alone, while the rest of the world uses kilograms.

Is my data sent anywhere?

No. The conversion runs entirely in your browser — no values are ever sent to a server.

Stone to Pounds Converter

The stone (st) is an imperial unit of weight equal to exactly 14 pounds (lb). Still widely used in UK and Irish everyday speech for body weight — “I weigh about 12 stone” — it can cause confusion when dealing with gym apps, nutrition trackers, or medical records that use pounds or kilograms. This converter handles both directions and also accepts the common mixed format of stone and pounds (e.g. 11 st 4 lb).

How it works

The conversion is a single multiplication or division by the exact factor 14:

lb = st × 14
st = lb ÷ 14

Because 14 is a whole number defined by statute (not a physical measurement), there is no rounding error in this relationship. Ten stone is exactly 140 lb — not approximately 140 lb. The only rounding that can occur is when you divide back: for example, 165 lb ÷ 14 = 11.7857… st, which the converter displays as 11 st 11 lb.

Mixed-weight input (st + lb)

When a weight is expressed as X stone Y pounds, the total in pounds is:

total lb = (X × 14) + Y

So 11 st 4 lb = (11 × 14) + 4 = 154 + 4 = 158 lb. Enter both numbers in the compound section below the main converter and the total updates immediately.

Worked example

A person tells you they weigh 13 stone 8 pounds. You need the weight in total pounds for a BMI calculation:

Multiply the stone part by 14: 13 × 14 = 182 lb
Add the remaining pounds: 182 + 8 = 190 lb

Going the other way — a US gym record shows 175 lb and you want it in stone:

Divide by 14: 175 ÷ 14 = 12.5 st (exactly 12 st 7 lb, because 0.5 × 14 = 7)

Stone (st)	Total pounds (lb)
8 st	112 lb
9 st	126 lb
10 st	140 lb
11 st	154 lb
12 st	168 lb
13 st	182 lb
14 st	196 lb

Formula note

The formula lb = st × 14 is exact because both units are part of the same imperial system and the stone is defined as 14 pounds with no fractional component. This contrasts with the stone-to-kilogram conversion (st × 6.35029318 kg), which involves an irrational factor because the kilogram is defined independently via the metric system.

All calculations run entirely in your browser with no data sent to any server.