How to convert stone and pounds to kg

Doctors, gyms and many apps want your weight in kilograms, but your scales may show stone and pounds. Here's how to switch.

The two steps

1. Turn the pounds into part of a stone. Divide the pounds by 14, then add the answer to the stone.
2. Multiply by 6.35. The result is your weight in kilograms.

Worked example: 11 st 4 lb

4 ÷ 14 = 0.29, so the weight is 11.29 stone. Then 11.29 × 6.35 = 71.7 kg.

Worked example: 9 st 10 lb

10 ÷ 14 = 0.71, so the weight is 9.71 stone. Then 9.71 × 6.35 = 61.7 kg.

Another way: go through pounds

Multiply the stone by 14 and add the pounds to get a total in pounds. Then divide by 2.2. For 12 st 6 lb: 12 × 14 + 6 = 174 lb, and 174 ÷ 2.2 = 79.1 kg. The exact answer is 78.9 kg, because 2.2 is slightly rounded.

Quick reference

Stone and pounds	Kilograms
8 st 0 lb	50.8 kg
9 st 7 lb	60.3 kg
10 st 0 lb	63.5 kg
10 st 7 lb	66.7 kg
11 st 0 lb	69.9 kg
11 st 7 lb	73.0 kg
12 st 0 lb	76.2 kg
12 st 7 lb	79.4 kg
13 st 0 lb	82.6 kg
14 st 0 lb	88.9 kg
15 st 0 lb	95.3 kg
16 st 0 lb	101.6 kg

For a full table from 6 to 25 stone, see the stone to kg calculator.