Weight conversion
Stone to Kilogram converter
Convert st to kg instantly, choose the displayed precision, and verify the result with the formula and reference table below.
Kilogram (kg)
Rounded for display only; calculations retain full precision.
Rounding and precision rules
- Convr calculates first and rounds the displayed result only once, at the final step.
- The default is a maximum of 6 decimal places; trailing zeros are removed.
- Very small values that would appear as zero, and values of 10¹² or more, use scientific notation.
- Display precision is not measurement uncertainty. For scientific, engineering, or regulated work, retain only the digits justified by the source measurement.
Practical context
Understanding this conversion
Stone is still used informally for human body weight in the United Kingdom and Ireland. Kilograms are used for medical records, sports classifications, travel forms, and most international weight reporting.
Measurements written as “11 st 6 lb” combine two units. They should not be entered as the decimal 11.6 stone; the six pounds represent 6 ÷ 14 stone.
Reviewed August 16, 2026.
Calculation
Stone to Kilogram formula
kg = st × 6.350293
Calculations retain full precision and the result is rounded only for display.
Worked example
For 10 st, the result is 63.502932 kg. Substitute 10 st into the formula to obtain 63.502932 kg.
A numerical value expressed in kilogram is usually larger than the same measurement expressed in stone, because 1 st equals 6.350293 kg.
Stone to Kilogram reference table
Common values rounded to a maximum of 6 decimal places.
| Stone (st) | Kilogram (kg) |
|---|---|
| 1 st | 6.350293 kg |
| 5 st | 31.751466 kg |
| 10 st | 63.502932 kg |
| 50 st | 317.514659 kg |
| 100 st | 635.029318 kg |
Understanding the units
About Stone and Kilogram
Stone (st)
One stone (st) equals 6.35029318 kg, the base relationship used for this weight conversion.
Kilogram (kg)
Kilogram (kg) is the base unit used by Convr for weight calculations.
When this conversion is useful
Stone to Kilogram conversion is useful for shipping, recipes, product specifications, laboratory work, and body-weight records. It lets you compare the same mass or weight across documents, tools, or standards that use different units.
Learn with Convr
Conversion guides
Metric vs Imperial Units: A Practical Comparison
Understand how metric, US customary, and Imperial units differ, where each system is used, and how to convert between them reliably.
Read guide →FoundationsSignificant Figures and Rounding in Unit Conversions
Learn when to round conversion results, how significant figures preserve measurement meaning, and why more decimals do not guarantee more accuracy.
Read guide →Answers at a glance
Frequently asked questions
How many kilograms are in one stone?
One stone equals exactly 14 avoirdupois pounds, or approximately 6.35029318 kilograms.
How should stone and pounds be entered?
Convert the extra pounds to stone by dividing them by 14, add that decimal to the whole stone value, and then convert the total.
How does Convr round Stone to Kilogram results?
Convr keeps full numeric precision during the calculation and rounds only the displayed result. The default is a maximum of 6 decimal places, with selectable precision on this page.
Can I convert negative or decimal stone values?
Yes. The converter accepts positive, negative, decimal, and scientific-notation values. Negative values are physically meaningful for some scales, such as temperature, but not for every measured quantity.
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