Kilograms to Stone: The Complete Guide
If you're visiting the UK, using a British fitness app, or communicating weight with someone who uses stone, you'll need to convert kilograms to stone. The stone is 6.35029 kg, and is subdivided into 14 pounds.
The Conversion Formula
stone = kilograms ÷ 6.35029To get stone and pounds: take the whole number as stone, multiply the decimal part by 14 to get remaining pounds.
Body Weight Reference Table
- 50 kg = 7 st 12 lb
- 60 kg = 9 st 6 lb
- 65 kg = 10 st 3 lb
- 70 kg = 11 st 0 lb
- 75 kg = 11 st 11 lb
- 80 kg = 12 st 8 lb
- 90 kg = 14 st 2 lb
- 100 kg = 15 st 10 lb
Worked Example
73 kg ÷ 6.35029 = 11.496 stone → 11 stone, then 0.496 × 14 = 6.94 ≈ 7 pounds. So 73 kg = 11 st 7 lb.
Convert any weight instantly: Free kg to stone converter
Complete Reference Table
- 50 kg = 7 st 12.3 lb (7.874 st)
- 60 kg = 9 st 6.8 lb (9.449 st)
- 70 kg = 11 st 0.3 lb (11.023 st)
- 75 kg = 11 st 11.1 lb (11.811 st)
- 80 kg = 12 st 8.7 lb (12.598 st)
- 90 kg = 14 st 2.2 lb (14.173 st)
- 100 kg = 15 st 10.0 lb (15.747 st)
- 110 kg = 17 st 5.4 lb (17.322 st)
Stone and Pounds: The British System
The stone (14 pounds) is a unit of body weight used primarily in the United Kingdom and Ireland. It is almost never used in other countries, including the United States (which uses pounds) and the rest of the world (which uses kilograms). When expressing weight in stones, the convention is to write the remainder in pounds: 75 kg = 11 stone 11 pounds, often written as 11 st 11 lb. The decimal form (11.81 stone) is less common in everyday speech. UK medical records have mostly switched to kilograms, but many patients still think in stones for personal weight tracking.
Common Mistakes
- Using 14 as an approximate divider: Dividing kg by 6.35 gives stone directly. Dividing by 14 gives the wrong answer because the stone is 14 pounds but 1 kg ≠ 1 pound. The correct factor is 1 kg = 0.157473 stone.
- Forgetting the pound remainder: Saying "11 stone" when you mean "11 stone 11 pounds" understates weight by nearly a pound. Always express the remainder in pounds when communicating weight in British contexts.
- Stone vs kilogram in clinical settings: UK NHS staff document weight in kg; if a patient gives their weight in stones, always convert before recording to avoid dangerous drug dosing errors.
Frequently Asked Questions
How many kg is one stone exactly?
One stone is exactly 14 pounds, and since 1 pound is exactly 0.45359237 kg, one stone equals exactly 6.35029318 kg. For practical purposes, 1 stone ≈ 6.35 kg.
Do any countries other than the UK use stone for body weight?
Ireland uses stones informally alongside kilograms, similarly to the UK. In some parts of the Caribbean and among British expatriate communities, stones are still used colloquially. Elsewhere in the world, the stone is not used — the US uses pounds, and all other countries use kilograms.
What is a healthy weight range in stones?
A healthy BMI of 18.5–24.9 for an adult of average height (175 cm / 5 ft 9 in) corresponds to approximately 56–76 kg, or roughly 9 stone to 12 stone. However, BMI is a screening tool only — consult a healthcare professional for personal weight advice.