How many kilograms are in one stone?

One stone equals exactly 6.35029318 kilograms. This is the internationally recognized conversion factor used in the UK and Ireland for body weight.

How do I convert kg to stones and pounds?

Divide the kilogram value by 6.35029318 to get the total stones. The whole number is the stones, and the decimal remainder multiplied by 14 gives you the remaining pounds. For example, 80 kg = 12.598 stones = 12 stones 8.4 pounds.

Why do some countries use stones for weight?

The stone is a traditional unit of weight used primarily in the United Kingdom and Ireland for expressing human body weight. Though the UK officially adopted the metric system, stones remain culturally ingrained for personal weight measurement.

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

The Kilograms to Stones Formula

Converting kilograms to stones is straightforward with a single division. The stone is an imperial unit still widely used in the United Kingdom and Ireland for measuring body weight:

Stones = Kilograms ÷ 6.35029318

For a simpler approximation, you can divide by 6.35. One stone equals exactly 14 pounds, and one pound equals 0.45359237 kilograms, which gives us the precise conversion factor of 6.35029318 kg per stone.

Step-by-Step Examples

Example 1: Converting 70 kg to Stones

Step 1: Divide 70 by 6.35029318.
Step 2: 70 ÷ 6.35029318 = 11.023 stones.
Step 3: The whole number is 11 stones. The remainder (0.023 × 14) = 0.32 pounds.
Result: 70 kg = 11 stones 0.3 pounds (approximately 11 st 0 lb).

Example 2: Converting 85 kg to Stones

Step 1: 85 ÷ 6.35029318 = 13.386 stones.
Step 2: Whole stones: 13. Remainder: 0.386 × 14 = 5.4 pounds.
Result: 85 kg = 13 stones 5.4 pounds.

Example 3: Converting 100 kg to Stones

Step 1: 100 ÷ 6.35029318 = 15.747 stones.
Step 2: Whole stones: 15. Remainder: 0.747 × 14 = 10.5 pounds.
Result: 100 kg = 15 stones 10.5 pounds.

Use our weight converter for instant, precise results.

Quick Reference Table

Kilograms	Stones (decimal)	Stones & Pounds
50 kg	7.87 st	7 st 12.2 lb
55 kg	8.66 st	8 st 9.2 lb
60 kg	9.45 st	9 st 6.3 lb
65 kg	10.24 st	10 st 3.3 lb
70 kg	11.02 st	11 st 0.3 lb
75 kg	11.81 st	11 st 11.3 lb
80 kg	12.60 st	12 st 8.4 lb
85 kg	13.39 st	13 st 5.4 lb
90 kg	14.17 st	14 st 2.4 lb
95 kg	14.96 st	14 st 13.4 lb
100 kg	15.75 st	15 st 10.5 lb

Real-World Applications

Health and Fitness

In the UK, doctors' offices often weigh patients in kilograms, but many people think of their weight in stones. Understanding this conversion helps you interpret medical records and set fitness goals in your preferred unit.

Sports

Boxing, wrestling, and horse racing in the UK frequently use stones for weight classes. A boxer competing at the light heavyweight limit of 79.38 kg needs to know this is 12 stones 7 pounds to communicate effectively with trainers and officials.

Travel Between Metric and Imperial Countries

If you are traveling between continental Europe (metric) and the UK or Ireland, knowing the conversion helps you discuss weight naturally in either system. Luggage limits are typically stated in kilograms, but you might think in stones for body weight.

Tips for Quick Mental Conversion

For a rough mental estimate, remember that 1 stone is approximately 6.35 kg. You can round to 6.5 for easier mental math: divide by 6.5 (or multiply by 2 and divide by 13). This gives results within about 2% accuracy, which is close enough for everyday conversation. For precise conversions, use our kilograms to pounds converter.