About Stone → Kg
When UK friends report weight in stone, converting to kilograms helps compare with metric BMI tools and gym programs.
Combine stone and pounds into total pounds, then convert to kg.
Direction: stone (and lbs) to kg.
Weight
Stone to Kg Converter
When UK friends report weight in stone, converting to kilograms helps compare with metric BMI tools and gym programs.
How to use this tool
Enter stone and pounds as prompted. Calculate for kilograms.
Formula & methodology
This stone to kg converter applies the standard relationship below. Intermediate values are kept at full precision; only the displayed result is rounded.
kg = (stone x 14 + lb) x 0.45359237
Tips for accurate results
- Do not enter decimal stone unless the form supports it—use separate lb field.
- Reverse with kg-to-stone.
- Document kg in medical forms even if you speak in stone daily.
- Rounding lb remainder affects kg slightly—use full precision internally.
Frequently asked questions
11 stone in kg?
154 lb is about 69.85 kg (exact depends on extra pounds).
Why stone?
Historical UK customary unit equal to 14 lb.
Free?
Yes.
Baby weight?
Neonatal weights usually use lb/oz or kg directly—not stone.
Sources & references
The factors and formulas used by this tool follow these references:
- NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
- BIPM — The International System of Units (SI Brochure, 9th edition)
Last reviewed: September 2026. Found an error? Tell us and we will correct it.
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