Stones to Pounds Mass Converter
Common Conversions
| st | lb |
|---|---|
| 0.5 | 7 |
| 1 | 14 |
| 2 | 28 |
| 5 | 70 |
| 7 | 98 |
| 10 | 140 |
| 12 | 168 |
| 15 | 210 |
| 20 | 280 |
| 25 | 350 |
Why this conversion matters in chemistry
UK inpatient charting is a worked example. A patient charted as 12 st 4 lb on the bedside record converts to 172 lb — the intermediate that becomes 78.0 kg for the weight-based vancomycin dose at 15–20 mg/kg every 12 hours, or for an enoxaparin treatment dose at 1 mg/kg every 12 hours. A factor of 14 lb per stone is exact through the British Weights and Measures Act of 1835. The conversion sits at the edge between UK clinical body-weight reporting and the lb form many US-derived dosing tables and pharmacokinetic models still expect.
Formula
lb = st × 14
Worked Examples
1 st = 14 lb
The conversion anchor — 1 stone is exactly 14 pounds.
10 st = 140 lb
About a typical adult body weight in pounds.
12.5 st = 175 lb
About an average adult male body weight.
Frequently Asked Questions
How do I convert stones to pounds?
Multiply by 14. One stone is defined as exactly 14 avoirdupois pounds, so the factor is exact and the arithmetic is integer for whole-stone inputs.
Why is a stone 14 pounds?
The stone has been used since medieval times for weighing agricultural goods. Standardization at exactly 14 pounds came through the British Weights and Measures Act of 1835.
Is the stone used in the US?
Not really. US body weight reporting sticks with pounds. In the UK and Ireland, body weight is typically given as 'X stone Y pounds' (e.g., '11 stone 4'), with the mixed format the routine on patient-facing forms.