Stones to Kilograms Mass Converter
Common Conversions
| st | kg |
|---|---|
| 0.1 | 0.635 |
| 0.5 | 3.175 |
| 1 | 6.35 |
| 2 | 12.701 |
| 5 | 31.751 |
| 10 | 63.503 |
| 25 | 158.757 |
| 50 | 317.515 |
| 100 | 635.029 |
| 1000 | 6350.29 |
Why this conversion matters in chemistry
UK obstetric weight tracking is one of the everyday contexts. A 10 st starting body weight enters the electronic maternity record as 63.50 kg — the form the Institute of Medicine gestational weight gain recommendations (11.5–16 kg for normal-BMI pregnancies) use against NICE CG62 antenatal-care BMI thresholds. The ratio of 6.35029 kg per stone is exact through 1 st = 14 lb × 0.45359237 kg/lb. The conversion sits at the handoff between UK conventional body-weight reporting and SI-based clinical guidelines.
Formula
kg = st × 6.35029
Worked Examples
1 st = 6.350 kg
One stone — the conversion anchor.
10 st = 63.503 kg
About a typical adult body weight in UK conventional units.
14 st = 88.904 kg
14 stone = 196 lb — useful as an upper reference.
Frequently Asked Questions
How do I convert stones to kilograms?
Multiply by 6.35029. One stone is exactly 14 pounds, and 1 lb = 0.453592 kg, so 1 st = 14 × 0.453592 = 6.35029 kg. The factor is exact through both definitions.
Why does body weight matter in pharmacy?
Drug dosing is often calculated per kilogram of body weight (mg/kg). A patient reporting weight in stones needs conversion to kg before chemotherapy, anesthetic, or other weight-based dose calculations land in the right range.
Where is the stone still used?
Common in the UK and Ireland for personal body weight. The unit equals exactly 14 avoirdupois pounds. Scientific and medical work uses kg exclusively; the conversion lives at the patient-facing communication boundary.