Kilograms to StoneFree online conversion calculator — instant results, no sign-up
Convert kilograms to stone and back.
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About the Kilograms to Stone
The Kilograms to Stone calculator converts a mass entered in kilograms into stone, a unit commonly used for body weight in the UK and Ireland. It also displays the reverse conversion factor so you can convert stone back to kilograms. With the default input of 1 kilogram, the result is 0.157473 stone.
- Value in kilograms (kilograms)
- Enter the mass in kilograms; the default value is 1 kilogram.
Formula and method
s = k / 6.35029318; for the reverse conversion, k = s × 6.35029318.
- kMass in kilograms.
- sThe equivalent mass in stone.
Divide the kilogram input by 6.35029318, the exact number of kilograms in one stone, then round the displayed result to six decimal places. For the default input, 1 / 6.35029318 gives 0.157473 stone when rounded. The reverse conversion factor is displayed as 6.350293 kilograms per stone.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in kilograms1 kilograms
Results
- stone0.157473
- 1 kilograms =0.157473 stone
- 1 stone =6.350293 kilograms
How to use the Kilograms to Stone
- 1Enter your mass in the Value in kilograms (kilograms) field, or leave the default value of 1.
- 2Read the calculated stone result: the default input produces 0.157473 stone.
- 3Check the forward conversion row, which shows 1 kilogram = 0.157473 stone.
- 4Read the reverse conversion row, which shows 1 stone = 6.350293 kilograms; to convert a stone value back to kilograms, multiply it by the full conversion factor.
Reading your result
The “stone = 0.157473” output is the converted value for the default input. The “1 kilograms = = 0.157473 stone” row repeats that conversion with both units; the duplicated equals sign is a display artifact, not an additional operation. The “1 stone = = 6.350293 kilograms” row gives the reverse unit equivalence, rounded to six decimal places, rather than a second result calculated from your input.
Limitations
This conversion uses the standard stone of 14 avoirdupois pounds, exactly equal to 6.35029318 kilograms. Displayed values are rounded, so converting back with the displayed factor may introduce a small rounding difference. The output is decimal stone, not a stone-and-pounds split. The calculator converts units only; it does not assess whether a body weight is healthy, and its result is only as accurate as the entered measurement.
Common questions
Why does the default input of 1 kilogram give 0.157473 stone?+
One stone is larger than one kilogram: it equals exactly 6.35029318 kilograms. Dividing 1 kilogram by that factor gives 0.157473 stone when rounded to six decimal places.
How do I convert stone back to kilograms?+
Multiply the stone value by 6.35029318. The calculator's reverse equivalence row displays this factor rounded: 1 stone = 6.350293 kilograms.
Does the decimal part of the stone result represent pounds?+
No. The result is decimal stone. To express it as stone and pounds, keep the whole-number stone portion and multiply the fractional stone portion by 14.
Why is the kilograms-per-stone factor longer in the formula than in the output?+
The formula uses the exact factor, 6.35029318 kilograms per stone, while the output displays 6.350293 to six decimal places. Keeping the full factor during calculation avoids unnecessary rounding error.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
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Results are estimates for informational purposes and are not financial, medical or legal advice.