Stone to Kg

British Imperial Mass Standards & Weights and Measures Act

The stone (symbol: st) is a traditional British imperial unit of bodyweight mass:

• 1 Stone (st): 14 Pounds (lbs Exact) = 6.35029318 Kilograms (kg Exact)

• 1 Kilogram (kg): 0.157473 Stone = 2.204623 Pounds

• 1 Pound (lb): (1) / (14) Stone = 0.45359237 kg

Primary Adult Bodyweight Benchmarks Table

• 8 st 0 lbs (112 lbs): 50.80 kg

• 10 st 0 lbs (140 lbs): 63.50 kg

• 11 st 0 lbs (154 lbs): 69.85 kg

• 11 st 6 lbs (160 lbs): 72.57 kg

• 12 st 0 lbs (168 lbs): 76.20 kg

• 13 st 0 lbs (182 lbs): 82.55 kg

• 14 st 0 lbs (196 lbs): 88.90 kg

• 15 st 0 lbs (210 lbs): 95.25 kg

• 20 st 0 lbs (280 lbs): 127.01 kg

Equations

• Kilograms (kg) = [(Stone × 14) + Extra Pounds] × 0.45359237

• Stone = Kilograms6.350293

How to Use This Calculator

Enter your Weight in Stone (st) (e.g. 11), Extra Pounds (lbs) (e.g. 6), British Healthcare & Fitness Benchmark — choose from Custom Weight Value, 8 st 0 lbs (50.80 kg / Petite Adult), 10 st 0 lbs (63.50 kg / Light Adult), and Conversion Direction — choose from Stone to Kilograms (st → kg / multiply by 6.350), Kilograms to Stone (kg → st / divide by 6.350). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Conversion factors used in this calculator:

1 stone = 14 lbs exact

Worked Example

An individual weighing 11 stone 6 lbs on a British bathroom scale weighs exactly 72.57 kg (or 160.0 lbs) on a medical hospital 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.