Stone to Kilogram Converter
Convert stone to kg instantly. Free stone to kg calculator with formula, examples and FAQs.
Quick answer
1 stone equals 6.35029 kg. To convert stone to kg, multiply the stone value by 6.35029 — so 10 stone = 63.5029 kg. This factor is exact, and the reverse conversion (kg to stone) simply divides by 6.35029 instead of multiplying.
Converted value
6.35
1.00 stone = 6.35 kg
What is stone to kg?
stone to kg is a weight conversion: the measured amount does not change, just the way it is expressed. It matters most to UK users and fitness trackers. A single conversion factor (kg = stone × 6.35029) handles any value, large or small.
Real-world uses: why convert stone to kg?
Converting stone to kg bridges two ways of measuring the same thing. People do it most often when converting UK body weight to kilograms, and on the receiving side when checking parcel and luggage weight limits. Having the exact value — not a rough estimate — prevents costly mistakes in paperwork, purchases and planning.
- •Converting UK body weight to kilograms.
- •Tracking fitness progress in metric.
- •Comparing weight on medical charts.
- •Understanding stone measurements abroad.
- •Checking parcel and luggage weight limits.
Who uses this conversion?
How the stone to kg conversion is calculated
This is the same arithmetic that calculators and search engines use — no rounded shortcuts.
kg = stone × 6.35029
- Both stone and kg are defined in terms of the same base unit, the gram.
- 1 stone = 6350.2932 gram, and 1 kg = 1000 gram.
- Divide one definition by the other to get the conversion factor: 6350.2932 ÷ 1000 = 6.350293.
- So kg = stone × 6.35029. Multiply any stone value by 6.350293 to get the result in kg.
Precision: Mass factors are exact by definition, so no precision is lost in the maths. The displayed value is rounded to four decimal places for readability.
Example calculations
- •1 stone = 6.3503 kg
- •8 stone = 50.8023 kg
- •11 stone = 69.8532 kg
stone to kg quick reference table
Common stone values converted to kg, each calculated with the exact factor.
| stone | kg |
|---|---|
| 10 | 63.5029 |
| 25 | 158.7573 |
| 50 | 317.5147 |
| 100 | 635.0293 |
| 250 | 1587.5733 |
| 500 | 3175.1466 |
| 1000 | 6350.2932 |
| 2500 | 15875.7329 |
| 5000 | 31751.4659 |
| 10000 | 63502.9318 |
Common mistakes to avoid
- •Converting in the wrong direction — multiplying when you should divide (or vice versa). Sanity-check whether kg should come out larger or smaller than stone.
- •Rounding too early. Keep full precision during the calculation and round only the final kg value.
- •Confusing mass units (kg, g) with imperial weight (lb, oz) and applying the wrong base factor.
Common questions about weight conversions
Is this weight conversion exact?
Yes. Mass definitions such as 1 lb = 0.45359237 kg and 1 oz = 28.349523 g are exact, so results are precise to the decimals shown.
Why do my results differ slightly?
Usually because of a rounded factor (2.2 instead of 2.204623) or mixing mass with force. We use the full-precision international factors.
Metric or imperial for weight?
Metric (kg, g) dominates science and most of the world; imperial (lb, oz, stone) is common for US and UK body weight and cooking. Convert exactly here rather than estimating.
Can I round the result?
Yes — kitchen and body-weight values rarely need more than one decimal. Keep more precision for lab or trade use and round last.
History of these units
History of the stone
imperial
The stone was historically used for trade weights and varied by commodity before being fixed at 14 pounds. It remains an everyday unit for body weight in the UK and Ireland.
History of the kilogram
metric (SI base unit)
The kilogram is the SI base unit of mass. Once defined by a physical platinum-iridium cylinder near Paris, it was redefined in 2019 in terms of the Planck constant for permanent stability.
Related converters
More weight conversions
Popular conversions
Support
Frequently asked questions
How do I convert stone to kg?
What is 1 stone in kg?
How do I convert kg back to stone?
When would I need to convert stone to kg?
Is the stone to kg factor exact?
Is my data private when I use this stone to kg converter?
Learn more