What this calculator does
Kilos to stones is a common conversion wherever body weight is discussed in the UK, Ireland or Australia, since the stone (14 lb, about 6.35 kg) remains the everyday unit for a person's weight in those countries even though scales and medical charts elsewhere use kilograms. One stone is exactly 6.35029 kg.
This calculator converts kilograms to stones, shown as a whole number of stones plus remaining pounds the way it is normally spoken, or converts stones back to kilograms. It also shows the equivalent in decimal stones and in total pounds, so the figure fits whichever format a form, chart or conversation calls for.
The formula
A stone is defined as 14 pounds, which comes to exactly 6.35029 kg. Converting kilograms to stones means dividing by 6.35029; converting stones to kilograms means multiplying by 6.35029. The whole-stone-plus-pounds figure takes the whole number of stones and converts only the leftover fraction into pounds, which is how a weight is usually read out loud.
| Term | Meaning |
|---|---|
| Stone | A British and Irish weight unit equal to 14 pounds, or exactly 6.35029 kg. |
| Kilogram | The SI base unit of mass, the standard unit on most bathroom scales and medical charts outside the UK and Ireland. |
| Pound | An imperial weight unit; there are 14 in a stone, and one pound is 0.453592 kg. |
The inputs explained
| Field | What to enter |
|---|---|
| Convert | Choose from Kilograms to stones, Stones to kilograms. |
| Amount | The amount to convert: kilograms if converting to stones, or stones if converting to kilograms. |
When to use it
Reading a UK or Irish weight chart
Body weight in the UK and Ireland is commonly quoted in stones and pounds rather than kilograms, so converting a kilogram figure from a scale or a medical record into stones matches how it would normally be discussed.
Comparing a weight goal set in the other unit
A weight-loss or fitness target set in stones needs converting to kilograms to compare against a scale that only reads in kg, or the reverse when the scale is in stones.
Filling in a form that asks for one unit
Some UK forms, from gym sign-ups to medical questionnaires, ask specifically for weight in stones and pounds rather than kilograms, or vice versa.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
What are common kilogram weights in stones?
A range of kilogram amounts converted to stones and pounds.
| Kilograms | Stones and pounds | Stones (decimal) |
|---|---|---|
| 50 kg | 7 st 12.2 lb | 7.874 st |
| 60 kg | 9 st 6.3 lb | 9.448 st |
| 70 kg | 11 st 0.3 lb | 11.023 st |
| 80 kg | 12 st 8.4 lb | 12.598 st |
| 90 kg | 14 st 2.4 lb | 14.173 st |
| 100 kg | 15 st 10.5 lb | 15.747 st |
What are common stone weights in kilograms?
A range of stone amounts converted to kilograms.
| Stones | Kilograms | Total in pounds |
|---|---|---|
| 8 st | 50.80 kg | 112.0 lb |
| 9 st | 57.15 kg | 126.0 lb |
| 10 st | 63.50 kg | 140.0 lb |
| 11 st | 69.85 kg | 154.0 lb |
| 12 st | 76.20 kg | 168.0 lb |
| 14 st | 88.90 kg | 196.0 lb |
Questions
How many pounds are in a stone?
Exactly 14. A stone is defined as 14 pounds, which is where the 6.35029 kg conversion factor comes from: 14 × 0.453592 kg per pound.
Why do the UK and Ireland use stones instead of kilograms for body weight?
It is a matter of custom rather than measurement standard: the UK and Ireland use metric units for most purposes but have kept the stone specifically for describing a person's weight, much as some countries kept a customary unit for one particular use.
Does the pounds-kilos calculator on this site already cover stones?
The pounds to kilos calculator shows a stone equivalent alongside a pounds-and-kilograms conversion, but it does not take a stone amount as the input. This calculator converts directly between kilograms and stones in either direction.
How precise is the 6.35029 kg figure?
It is exact, not rounded: a pound is defined as exactly 0.45359237 kg, and 14 of those comes to 6.35029318 kg, which this calculator rounds only in its displayed output, not in the underlying arithmetic.
For a straightforward kilograms-to-pounds conversion without stones, see the pounds to kilos calculator. For the full ladder of mass units, including tonnes and both US and UK tons, use the weight and mass converter.