Pounds to Stone
### British Imperial Mass Metrology & Weights and Measures Act Under British and Commonwealth customary standards, the **stone (symbol: st)** is legally defined as exactly **14 avoirdupois pounds**.
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📐 Formula
💡 Practical Example
A person weighing 160 pounds measures exactly 11 stone 6 pounds (or 72.6 kg) on a UK medical scale.
📖 About Pounds to Stone
British Imperial Mass Metrology & Weights and Measures Act
Under British and Commonwealth customary standards, the stone (symbol: st) is legally defined as exactly 14 avoirdupois pounds (6.35029318 kg):
- 1 Stone (st): 14.0 Pounds (lbs) = 224.0 Ounces (oz) = 6.350293 kg = 6,350.29 g
- 1 Pound (lb): (1) / (14) Stone = 0.071429 st = 0.453592 kg
Primary UK Bodyweight Benchmarks Table
- 14.0 lbs: 1 st 0 lbs = 1.00 st = 6.35 kg
- 140.0 lbs: 10 st 0 lbs = 10.00 st = 63.50 kg
- 154.0 lbs: 11 st 0 lbs = 11.00 st = 69.85 kg
- 160.0 lbs: 11 st 6 lbs = 11.43 st = 72.57 kg
- 168.0 lbs: 12 st 0 lbs = 12.00 st = 76.20 kg
- 182.0 lbs: 13 st 0 lbs = 13.00 st = 82.55 kg
- 196.0 lbs: 14 st 0 lbs = 14.00 st = 88.90 kg
- 210.0 lbs: 15 st 0 lbs = 15.00 st = 95.25 kg
Equations
- Stone (st) = Pounds (lbs)14
- Pounds (lbs) = Stone (st) × 14
How to Use This Calculator
Enter your Weight Value to Convert (e.g. 160.0), UK Healthcare & Bodyweight Benchmark — choose from Custom Weight Value, 14.0 lbs (1.00 st / 1 Exact Stone), 140.0 lbs (10 st 0 lbs / 63.5 kg), and Conversion Direction — choose from Pounds to Stone (lbs → st / divide by 14), Stone to Pounds (st → lbs / multiply by 14). Results update instantly as you type — adjust any value to compare scenarios.
The Formula
Conversion factors used in this calculator:
1 stone = 14 pounds exact
Worked Example
A person weighing 160 pounds measures exactly 11 stone 6 pounds (or 72.6 kg) on a UK medical scale.
Understanding Your Result
Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.
💡 Methodological Standards & Calculation Accuracy
- All calculations are performed client-side in your browser using verified, standards-compliant mathematical algorithms.
- Results are provided for educational and informational analysis; verify critical applications with certified domain specialists.
- Ensure input values are entered in consistent units matching the selector options to guarantee accurate outputs.
- Periodic recalibration is recommended whenever baseline assumptions, operating parameters, or external conditions change.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.