Convert Stone to Kilograms
1 stone (st) equals 6.35029318 kilograms (kg).
1 st = 6.35029318 kg
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk stone to kilogram converter to paste a column from Excel.
How to Convert Stone to Kilogram
- 1 st = 6.35029318 kg
- 1 kg = 0.1574730444 st
- Example: convert 12 st to kg: 12 st = 12 × 6.35029318 kg = 76.20351816 kg
Reference conditions. st: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
kg = st × 6.35029318
Derivation from SI units:
- 1 st = 14 lb = 6.35029318 kg (exact)
- SI base unit, fixed by the Planck constant h = 6.626 070 15 × 10⁻³⁴ J·s
Both units are defined exactly, so the factor is exact. Stone definition: stone; Kilogram definition: kilogram.
Worked examples
- A body weight of 12 st is 76.20351816 kg.
12 st × 6.35029318 = 76.20351816 kg - 10.5 st (10 st 7 lb) is 66.67807839 kg.
10.5 st × 6.35029318 = 66.67807839 kg
Stone to Kilogram conversion table
| Stone (st) | Kilograms (kg) |
|---|---|
| 1 st | 6.35029318 kg |
| 5 st | 31.7514659 kg |
| 7 st | 44.45205226 kg |
| 8 st | 50.80234544 kg |
| 9 st | 57.15263862 kg |
| 10 st | 63.5029318 kg |
| 10.5 st | 66.67807839 kg |
| 11 st | 69.85322498 kg |
| 12 st | 76.20351816 kg |
| 13 st | 82.55381134 kg |
| 14 st | 88.90410452 kg |
| 15 st | 95.2543977 kg |
| 16 st | 101.6046909 kg |
| 18 st | 114.3052772 kg |
| 20 st | 127.0058636 kg |
Where it's used
UK body weights in stone are converted to kilograms for medical records, fitness apps and drug dosing.
Stone to other weight and mass units
| Conversion | 1 st equals |
|---|---|
| stone to kilogram | 6.35029318 kg |
| stone to gram | 6350.29318 g |
| stone to milligram | 6350293.18 mg |
| stone to microgram | 6350293180 µg |
| stone to metric ton | 0.00635029318 t |
| stone to pound | 14 lb |
| stone to ounce | 224 oz |
| stone to short ton | 0.007 ton (US) |
| stone to long ton | 0.00625 ton (UK) |
| stone to grain | 98000 gr |
| stone to troy ounce | 204.1666667 oz t |
| stone to carat | 31751.4659 ct |
Frequently asked questions
How do I convert stone and pounds to kg?
Convert to pounds first (stone × 14 + pounds), then multiply by 0.45359237. 11 st 4 lb = 158 lb = 71.67 kg.
How many kilograms are in 1 stone?
1 st = 6.35029318 kg.
How do I convert stone to kilograms?
Multiply the value in st by 6.35029318. For example, 12 st × 6.35029318 = 76.20351816 kg.
Is the st to kg conversion exact?
Yes. Both units are defined exactly, and 1 st is exactly 6.35029318 kg.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, pound (avoirdupois).
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Section 2.3.1, base unit definitions.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Stone to Kilograms. Retrieved October 17, 2026, from https://scientificconverters.com/mass/stone-to-kilograms/
IEEE
Scientific Converters, "Convert Stone to Kilograms," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/stone-to-kilograms/