What is a stone to kilograms converter?
A stone to kilograms converter turns a weight measured in stone (st) into kilograms (kg), and back again. The stone is an imperial unit used mainly in the United Kingdom and Ireland to describe body weight, while the kilogram is the metric standard used almost everywhere else and in all scientific and medical contexts. Converting between them is especially useful for health and fitness, where a UK gym-goer might track their weight in stone but a doctor or app expects kilograms.
The converter is bidirectional: type into the stone field or the kilograms field and the other updates instantly. Each field can also switch to a nearby unit such as pounds, grams, or ounces.
How does it work?
The conversion is built from two exact facts: one stone is 14 pounds, and one pound is 0.45359237 kilograms. Multiplying these gives one stone ≈ 6.35029 kilograms. To convert stone to kilograms you multiply by 6.35029; to reverse it you divide.
Every value is reduced to a common base unit before display, so switching a field’s unit re-expresses the same weight rather than clearing it.
Formula
And the inverse:
Example conversions
Convert 2 stone to kilograms
So 2 st is about 12.7006 kg.
Convert 6.35029 kilograms to stone
So 6.35029 kg is exactly 1 stone.
Conversion table
| Stone (st) | Kilograms (kg) |
|---|---|
| 1 | 6.35029 |
| 2 | 12.70059 |
| 5 | 31.75147 |
| 10 | 63.50293 |
| 11 | 69.85322 |
Notes
- A quick approximation is 1 st ≈ 6.35 kg, which is accurate enough for most everyday purposes.
- Body weight in stone is often written as “stone and pounds”; convert the whole stone and the leftover pounds separately, or use the stone to pounds converter first.
- The kilogram is the metric standard for mass, so medical records, passports, and sports federations outside the UK typically expect kilograms.
Frequently asked questions
How many kilograms are in a stone?
One stone is approximately 6.35029 kilograms.
How do I convert stone to kilograms?
Multiply the number of stone by 6.35029. For example, 11 st × 6.35029 ≈ 69.85 kg.
Why is a stone about 6.35 kilograms?
A stone is 14 pounds, and each pound is 0.45359237 kg. Multiplying 14 by 0.45359237 gives about 6.35029 kg per stone.
Can I convert stone-and-pounds body weight directly?
This converter takes a single value per field. For a weight like “11 st 6 lb”, first turn it into total stone (11 + 6/14 ≈ 11.4286 st) or total pounds, then convert.