Stone & Pounds to KG
Enter your weight in stones and pounds to get your exact kilogram equivalent instantly. Useful for GP appointments, medical forms, or fitness tracking.
Stone & Pounds → KG
0–13 (14 lbs = 1 stone)
Enter your weight
How the Conversion Works
British imperial scales show weight as whole stones plus a remainder in pounds. To convert to kilograms, each part is converted separately and added together.
Worked Example: 11 stone 3 pounds
- 111 stone × 6.35029 = 69.85 kg
- 23 pounds × 0.453592 = 1.36 kg
- 369.85 + 1.36 = 71.21 kg
Common Stone & Pound Conversions
These are the most frequently searched mixed-unit conversions. Click any stone value to see its full breakdown.
Most people in the UK know their weight in stones and pounds, but GP systems, hospital records, and nearly all medical calculators use kilograms. This disconnect causes real confusion — particularly when patients try to interpret their BMI or track weight for a medication dosage. When I see a patient who says they weigh "11 stone 3," I convert that to 71.21 kg before doing anything else. Getting comfortable with the kilogram figure for your own weight is genuinely useful for engaging with your own health data.
Quick Reference: Stone & Pounds to KG
Common stone and pound combinations and their kilogram equivalents. Useful for quickly checking mixed-unit weights without calculating.
| Stone & Pounds | Kilograms | Total Pounds |
|---|---|---|
| 8 st 0 lb | 50.80 kg | 112 lbs |
| 9 st 0 lb | 57.15 kg | 126 lbs |
| 9 st 7 lb | 60.33 kg | 133 lbs |
| 10 st 0 lb | 63.50 kg | 140 lbs |
| 10 st 7 lb | 66.68 kg | 147 lbs |
| 11 st 0 lb | 69.85 kg | 154 lbs |
| 11 st 7 lb | 73.03 kg | 161 lbs |
| 12 st 0 lb | 76.20 kg | 168 lbs |
| 12 st 7 lb | 79.38 kg | 175 lbs |
| 13 st 0 lb | 82.55 kg | 182 lbs |
| 13 st 7 lb | 85.73 kg | 189 lbs |
| 14 st 0 lb | 88.90 kg | 196 lbs |
| 14 st 7 lb | 92.08 kg | 203 lbs |
| 15 st 0 lb | 95.25 kg | 210 lbs |
How Stone and Pounds Work Together
In the British imperial system, weight is expressed in stone and pounds together — like saying "11 stone 3 pounds." One stone equals exactly 14 pounds, so fractional weights are expressed in pounds rather than decimals. This combined format is standard on UK bathroom scales, at GP surgeries, and in everyday conversation.
Converting to kilograms requires handling both parts separately. The stone portion is multiplied by 6.35029, the pound portion by 0.453592, and the two results are added. This is the exact method used by the calculator above.
Stone factor
× 6.35029
per whole stone
Pound factor
× 0.453592
per remaining pound
Frequently Asked Questions
How do I convert stones and pounds to kilograms?
Multiply your stones by 6.35029, multiply your pounds by 0.453592, and add the two results together. For example, 11 stone 3 lb: (11 × 6.35029) + (3 × 0.453592) = 69.85 + 1.36 = 71.21 kg.
How many kg is 12 stone 5 pounds?
12 stone 5 pounds is 79.38 kg. The calculation is: 12 times 14 plus 5 equals 173 total pounds, then 173 multiplied by 0.453592 equals 78.47 kg. Alternatively: (12 × 6.35029) + (5 × 0.453592) = 76.20 + 2.27 = 78.47 kg.
How many kg is 14 stone 7 pounds?
14 stone 7 pounds is 92.08 kg. The calculation is: 14 times 14 plus 7 equals 203 total pounds, then 203 multiplied by 0.453592 equals 92.08 kg.
How many pounds are in a stone?
There are exactly 14 pounds (lbs) in 1 stone (st). This means 7 pounds is exactly half a stone, and any remainder above 13 pounds rolls over into the next whole stone.
Why do British scales show stone and pounds together?
The imperial system expresses body weight as whole stones plus a remainder in pounds, similar to how height uses feet and inches. This combined format is standard on UK bathroom scales, at GP surgeries, and in everyday conversation. Converting to kilograms requires handling both parts separately.