Kilograms to stone Converter

How many stone are in a kilogram?

One kilogram is 0.157473 stone. The full conversion is stone = kilograms × 0.1574730444, and going the other way you divide instead of multiply.

A few anchor values worth memorising: 0.157473 st to the kilogram, 1.57473 st to ten, and 15.747304 st to a hundred. The calculator above handles the rest, including the awkward decimals.

The reference table under the converter lists the values people look up most often, so for a common figure you can read the answer off directly rather than typing anything.

Worked examples

Three worked examples, each multiplying by 0.15747304:

2.5 kg × 0.157473 = 0.3937 st. 25 kg × 0.157473 = 3.9368 st. 250 kg × 0.157473 = 39.3683 st.

To reverse any of them, divide instead of multiplying — or use the swap button above, which does the same thing without the arithmetic. Reversing a converted value should return you to exactly what you started with; if it does not, something has been rounded too early.

Doing this conversion in your head

The exact factor is 0.15747304, which nobody multiplies by in their head. It is very close to 1/6, so multiplying by 1 and dividing by 6 lands within 5.84% of the correct answer — accurate enough for anything short of engineering work.

Since the factor is less than one, the number always gets smaller: a kilogram is larger than a stone, so any quantity converts to fewer of them. A result larger than what you started with means the conversion went the wrong way.

That sanity check catches the majority of real conversion errors. Before trusting any converted figure, ask whether the direction of change makes sense — it takes a second and it is the single most effective safeguard there is.

When you need to convert kilograms to stone

Most people arrive at this conversion from one of a few directions, each with its own tolerance for error.

On the source side, kilograms are body weight, luggage allowances, grocery pricing and shipping quotes. On the target side, stone is used for body weight in Britain and Ireland and essentially nowhere else. The conversion is essentially a translation between those two worlds — most often because a figure produced in one context has to be understood, submitted or acted on in the other.

Where the converted figure will be cut, dosed, billed or filed, round once at the end rather than at each step. For a rough sense of scale, round freely.

None of this leaves your browser. The conversion is a few lines of arithmetic, so there is no server involved and nothing to store.

What a kilogram and a stone actually are

The kilogram (kg). The SI base unit, redefined in 2019 in terms of the Planck constant rather than a metal cylinder in Paris.

The stone (st). Fourteen pounds; still the default for body weight in Britain and Ireland.

Since kilograms and stone both quantify mass against a common defined standard, nothing is lost in translating between them. The only imprecision anywhere in this page is deliberate rounding for readability.

Common mistakes when converting kilograms to stone

Stones are only used for body weight, and only in Britain and Ireland. A weight given as "11 stone 4" means 11 × 14 + 4 = 158 pounds, not 11.4 stone — the second number is pounds, not a decimal fraction. Feeding "11.4" into a converter gives you the wrong answer by about three pounds.

For a batch of figures, set the units once and work down the list rather than converting via a third unit — each intermediate step introduces its own rounding.