How to Convert kg to Stones and Pounds — Complete UK Weight Guide
Convert kilograms to stones and pounds for the UK system. Includes conversion chart, formula, and worked examples for common body weights from 45 kg to 130 kg.
In the United Kingdom and Ireland, body weight is traditionally measured in stones and pounds — a system that predates the metric system by centuries. While kilograms are now the official SI unit, many Brits still think in stone. This guide shows you exactly how to convert.
What is a Stone?
A stone (st) is a unit of mass equal to exactly 14 pounds (lbs) or 6.35029318 kilograms (kg). It is primarily used in the UK and Ireland for measuring body weight and is not part of the SI metric system.
1 stone = 14 pounds = 6.35029318 kg
The Formula: Kg to Stones and Pounds
Step 1: Convert kg to pounds
lbs = kg × 2.2046226218
Step 2: Divide pounds by 14 to get whole stones
stones = Math.floor(lbs / 14)
Step 3: The remainder is the extra pounds
extra_lbs = lbs - (stones × 14)
Example: 70 kg
- 70 × 2.2046 = 154.322 lbs
- 154.322 ÷ 14 = 11 stone (remainder: 154.322 - 154 = 0.322)
- 0.322 × 14 = actually: 154.322 - (11×14) = 154.322 - 154 = 0.322 lbs… Let’s be precise:
- 11 × 14 = 154
- 154.322 - 154 = 0.32 lbs → round to 0.3 lbs
- Result: 11 stone 0.3 lb
Kg to Stones and Pounds Conversion Chart
| Kilograms (kg) | Pounds (lbs) | Stones & Pounds |
|---|---|---|
| 45 kg | 99.21 lbs | 7 st 1.2 lb |
| 50 kg | 110.23 lbs | 7 st 12.2 lb |
| 55 kg | 121.25 lbs | 8 st 9.3 lb |
| 60 kg | 132.28 lbs | 9 st 6.3 lb |
| 61.2 kg | 134.92 lbs | 9 st 8.9 lb |
| 65 kg | 143.30 lbs | 10 st 3.3 lb |
| 70 kg | 154.32 lbs | 11 st 0.3 lb |
| 75 kg | 165.35 lbs | 11 st 11.3 lb |
| 80 kg | 176.37 lbs | 12 st 8.4 lb |
| 85 kg | 187.39 lbs | 13 st 5.4 lb |
| 90 kg | 198.42 lbs | 14 st 2.4 lb |
| 95 kg | 209.44 lbs | 14 st 13.4 lb |
| 100 kg | 220.46 lbs | 15 st 10.5 lb |
| 105 kg | 231.49 lbs | 16 st 7.5 lb |
| 110 kg | 242.51 lbs | 17 st 4.5 lb |
| 115 kg | 253.53 lbs | 18 st 1.5 lb |
| 120 kg | 264.55 lbs | 18 st 12.6 lb |
| 125 kg | 275.58 lbs | 19 st 9.6 lb |
| 130 kg | 286.60 lbs | 20 st 6.6 lb |
Reverse: Stones and Pounds to Kilograms
Formula:
kg = (stones × 14 + extra_lbs) × 0.45359237
Example: 19 stone 3 lb
- Total lbs = (19 × 14) + 3 = 266 + 3 = 269 lbs
- 269 × 0.45359237 = 122.017 kg
Worked Example: 61.2 kg in Stones and Pounds
- 61.2 × 2.2046 = 134.922 lbs
- 134.922 ÷ 14 = 9.637 → 9 whole stones
- 9 × 14 = 126, so 134.922 - 126 = 8.922 lbs
- Result: 9 stone 8.9 lb
Why Does the UK Still Use Stones?
The stone has been an official UK measurement for body weight since medieval times. Although the UK officially adopted the metric system in 1965, the stone persists in everyday culture — particularly for body weight, horse racing weights, and boxing divisions. You’ll find it on many UK bathroom scales alongside kg.
Frequently Asked Questions
How many kg is 1 stone?
1 stone = exactly 6.35029318 kilograms (or 14 pounds).
How do I convert 61.2 kg to stones and pounds?
61.2 kg = 134.92 lbs = 9 stone 8.9 lb.
What is 70 kg in stone?
70 kg = 154.32 lbs = 11 stone 0.3 lb.
How many kg is 7 stone?
7 stone = 7 × 6.35029 = 44.452 kg (or 7 × 14 × 0.45359 = 44.452 kg).
What does 19 st 3 lb mean in kg?
19 st 3 lb = (19 × 14 + 3) = 269 lbs = 122.017 kg.