Stone to KilogramsFree online conversion calculator — instant results, no sign-up
Convert stone to kilograms and back.
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About the Stone to Kilograms
The Stone to Kilograms calculator converts a weight in stone into kilograms and shows the equivalent conversion rates in both directions. With the default input of 1 stone, it displays 6.350293 kilograms. You can also use the reverse rate to convert kilograms back to stone.
- Value in stone (stone)
- Enter the weight in stone, using decimal stone for fractional amounts; the default value is 1.
Formula and method
k = s × c; s = k ÷ c, where c = 6.35029318 kg per stone. Displayed to six decimal places, c = 6.350293 and 1/c = 0.157473.
- sWeight expressed in stone.
- kThe same weight expressed in kilograms.
- cThe conversion factor of 6.35029318 kilograms per stone.
Multiply the entered stone value by the standard conversion factor of 6.35029318 kilograms per stone, then round the displayed result to six decimal places. For the default input, 1 × 6.35029318 gives the displayed result of 6.350293 kilograms. The reverse rate is the reciprocal of the conversion factor, displayed as 0.157473 stone per kilogram.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in stone1 stone
Results
- kilograms6.350293
- 1 stone =6.350293 kilograms
- 1 kilograms =0.157473 stone
How to use the Stone to Kilograms
- 1Enter the weight in the Value in stone (stone) field, or leave the default value of 1.
- 2Use decimal stone if the weight includes a fractional stone; do not enter stone and pounds as though they were a decimal.
- 3Read the kilograms result: with the default input, kilograms = 6.350293.
- 4Check the forward conversion row, which shows that 1 stone equals 6.350293 kilograms.
- 5For conversion back to stone, divide a kilogram value by 6.35029318; the reverse conversion row shows the rounded rate of 0.157473 stone per kilogram.
Reading your result
The output 'kilograms = 6.350293' is the converted weight for the default input of 1 stone. The row '1 stone = = 6.350293 kilograms' shows the forward unit conversion rate. The row '1 kilograms = = 0.157473 stone' shows the reverse unit conversion rate, not a second result for the entered stone value. The repeated equals signs in these row labels simply indicate equivalence.
Limitations
This conversion assumes the standard modern stone, equal to 14 international avoirdupois pounds, or exactly 6.35029318 kilograms. Displayed results and rates are rounded to six decimal places, so using the displayed reverse rate may introduce a small rounding difference. Decimal stone is not stone-and-pounds notation. The conversion changes units only; it does not assess whether a body weight is healthy or improve the accuracy of the original measurement.
Common questions
Why does the default input of 1 stone show 6.350293 kilograms?+
One standard stone is exactly 6.35029318 kilograms. Rounded to six decimal places, that is 6.350293 kilograms.
How do I convert kilograms back to stone?+
Divide the kilogram value by 6.35029318. The reverse row summarizes this relationship as 1 kilogram equaling approximately 0.157473 stone.
Can I enter a weight recorded in stone and pounds?+
First convert it to decimal stone by adding the pounds portion divided by 14 to the whole-stone portion. Enter that combined value in the stone field.
Why might converting back with 0.157473 not reproduce the original stone value exactly?+
The displayed reverse rate is rounded. Dividing by the full factor of 6.35029318 avoids the additional error caused by multiplying by that rounded rate.
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.