How many kilograms are in one stone?

One stone equals exactly 6.35029318 kilograms, or approximately 6.35 kg. One stone also equals 14 pounds.

How do I convert stones and pounds to kg?

First convert the total weight to just stones by dividing the pounds by 14 and adding to the stones. Then multiply by 6.35029. For example, 10 stone 7 pounds = 10.5 stones × 6.35029 = 66.68 kg.

Where is the stone unit still used?

The stone is primarily used in the United Kingdom and Ireland for expressing body weight. It is also used in some Commonwealth countries for horse racing. Most other countries use kilograms exclusively.

How to Convert Stones to Kilograms - Formula, Examples & Chart

The Stones to Kilograms Formula

Converting stones to kilograms requires a single multiplication:

Kilograms = Stones × 6.35029318

If you have a weight in stones and pounds, first convert to decimal stones by dividing the pounds portion by 14 (since 1 stone = 14 pounds), then multiply the total by 6.35029.

Step-by-Step Examples

Example 1: Converting 10 Stones to Kilograms

Calculation: 10 × 6.35029 = 63.50 kg.
Result: 10 stones = 63.5 kg.

Example 2: Converting 12 Stone 7 Pounds to Kilograms

Step 1: Convert to decimal stones: 12 + 7/14 = 12.5 stones.
Step 2: 12.5 × 6.35029 = 79.38 kg.
Result: 12 st 7 lb = 79.4 kg.

Example 3: Converting 8 Stone 3 Pounds to Kilograms

Step 1: Convert to decimal stones: 8 + 3/14 = 8.214 stones.
Step 2: 8.214 × 6.35029 = 52.16 kg.
Result: 8 st 3 lb = 52.2 kg.

Reference Table

Stones	Kilograms	Pounds
7	44.45	98
8	50.80	112
9	57.15	126
10	63.50	140
11	69.85	154
12	76.20	168
13	82.55	182
14	88.90	196
15	95.25	210
16	101.60	224
17	107.96	238
18	114.31	252

Real-World Applications

Medical Records

UK patients often know their weight in stones, but NHS medical records use kilograms. GPs and nurses convert daily when recording patient weights, calculating BMI, and determining medication dosages.

Fitness and Weight Loss

Many fitness apps and international programs use kilograms, but UK users prefer stones. Being able to convert helps you track progress across different platforms and programs.

Travel

Airline luggage limits are in kilograms. If you think of weight in stones, knowing that 1 stone is about 6.35 kg helps you quickly estimate whether your bag is within limits.

Quick Mental Math

For a rough estimate, multiply stones by 6.35 or, for easier mental math, multiply by 6 and add half a stone in kg (about 3 kg). For example, 10 stone ≈ 60 + 3 = 63 kg (exact: 63.5). Use our weight converter for precision.