If you’ve ever stepped on a scale in the UK and seen your weight in stones, you’ve probably wondered how that compares to the kilograms you’re used to. The stone is a uniquely British unit still used for body weight in clinics, gyms, and everyday conversation, and this guide walks you through converting kilograms to stones and pounds using the same conversion factors trusted by the NHS.
1 stone = 14 pounds (lb) ·
1 stone = 6.35029318 kilograms (kg) ·
70 kg ≈ 11 stone (11 st 0.3 lb) ·
UK standard weight unit: Stone (st) for body weight
Quick snapshot
- 1 stone = 14 lb = 6.35029318 kg (The Calculator Site (conversion resource))
- To convert kg to stone, divide by 6.35029318 (The Calculator Site)
- 70 kg = 11 stone 0.3 lb (Stone Synergy (conversion tool))
- The exact origin of the stone unit remains uncertain, with various historical definitions used before standardisation (Wikipedia (reference))
- Stone and pounds have been the standard UK body‑weight unit for over a century; NHS Scotland now provides official conversion charts for health records (NHS Scotland (health authority))
- For precise values, refer to the NHS conversion chart or use an online calculator, then check your BMI against healthy ranges (NHS Scotland)
One quick takeaway from the four cards above: the conversion factor between kilograms and stones is fixed by international agreement, but the stone’s historic roots are fuzzy. What matters for your daily life is the reliable formula used by every UK clinic.
| Label | Value | Source |
|---|---|---|
| Stone unit defined | 1 stone = 14 pounds avoirdupois (exactly 6.35029318 kg) | The Calculator Site (conversion resource) |
| UK/Ireland usage | Stone is standard for body weight; food packaging uses kg | Stone Synergy (conversion tool) |
| Conversion constant | 1 kg = 0.157473 stone (approx) | The Calculator Site (conversion resource) |
| NHS resource | Free conversion chart PDF from NHS Grampian | NHS Scotland (health authority) |
What is kg in stones and lbs?
Conversion factor
- 1 kilogram = 0.157473 stone (The Calculator Site (conversion resource))
- 1 stone = 14 pounds (University of Manchester (academic institution))
The core relationship is simple: one stone holds exactly 14 pounds, and one kilogram is about 0.1575 stone. That’s the fixed anchor for all conversions.
Simple formula
Stones = kg × 0.157473. To get the pounds remainder, take the decimal part of the stone result and multiply by 14. For example, 70 kg × 0.157473 = 11.0231 stone. The .0231 × 14 = 0.3234 lb, so 70 kg ≈ 11 st 0.3 lb (Stone Synergy (conversion tool)).
Bottom line: UK adults who use this factor can go from kg to stones in one multiplication. Keep the decimal remainder to find the extra pounds – no rounding needed until the final step.
What is a stone of weight in kg?
Stone to kg
- 1 stone = 6.35029318 kilograms (The Calculator Site (conversion resource))
Conversely, to go from stone to kg, multiply the stone value by 6.35029318. That number comes from the definition of the avoirdupois pound (453.59237 g) multiplied by 14.
Pounds in a stone
Every stone contains exactly 14 avoirdupois pounds. This is a legal definition in the UK and has been fixed since the Weights and Measures Act 1824 (Wikipedia (reference)).
The implication: because the stone is the everyday unit for body weight, a doctor or nurse in the UK will record your weight in stones and pounds even if the scale shows kilograms.
How to calculate kg to stone and pounds?
Step-by-step conversion
- Start with your weight in kilograms.
- Multiply by 2.20462 to get total pounds (YouTube Tutorial (instructional video)).
- Divide the total pounds by 14 to get the number of stones (the integer part).
- The remainder (decimal part × 14) gives the remaining pounds.
Example: 62 kg × 2.20462 = 136.686 lb. 136.686 ÷ 14 = 9.7633 → 9 stone. Remainder: 0.7633 × 14 = 10.686 lb ≈ 9 st 10.7 lb (YouTube Tutorial (instructional video)).
Using an online converter
For instant results, the The Calculator Site (conversion resource) offers a free tool that returns stones and pounds from any kilogram input. Many NHS clinics also provide printed charts.
Manual calculation example
Take 80 kg: 80 × 0.157473 = 12.5978 stone → 12 stone. Remainder: 0.5978 × 14 = 8.369 lb ≈ 12 st 8.4 lb. The NHS chart rounds this to 12 st 8 lb (NHS Sussex (health trust)).
Bottom line: UK patients who calculate manually should use the two‑step method (kg → lb, then lb ÷ 14) for the most intuitive approach. For regular use, bookmark an NHS‑style chart or a reliable online converter.
UK patients who know their weight only in stones may not realise that BMI calculations need kilograms. A quick conversion avoids errors in medication dosing and health assessments – your GP expects kg or a correctly converted st/lb value.
Is 11 stone 70 kg?
Verification
11 stone × 6.35029318 = 69.853 kg (The Calculator Site (conversion resource)). That is 0.147 kg short of 70 kg. So 11 stone is very close to 70 kg, but not exact. For practical purposes, many people say “11 stone” when they mean around 70 kg.
Common conversions
- 10 kg = 1 st 8 lb (approx) (Stone Synergy (conversion tool))
- 60 kg = 9 st 6.3 lb
- 70 kg = 11 st 0.3 lb
- 82 kg = 12 st 13 lb (NHS Scotland (health authority))
- 95 kg = 14 st 13 lb (Stone Synergy (conversion tool))
- 100 kg = 15 st 10 lb (NHS Scotland (health authority))
The pattern: for anyone tracking weight loss or gain in the UK, remembering that 1 stone ≈ 6.35 kg makes rough estimates much easier.
Rounding differences between conversion charts can add up. The NHS chart uses 6.35 kg per stone, while the exact factor is 6.35029318. Over 10 stone the difference is only about 30 g – negligible for most people, but important for clinical precision.
The implication: UK patients should verify which rounding convention their clinic uses to avoid cumulative errors in weight records.
What is my ideal weight for my height and age?
BMI reference
Body Mass Index (BMI) is calculated as weight in kilograms divided by height in metres squared: BMI = kg / m² (NHS (health service)).
- Healthy BMI range: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obese: 30+
NHS healthy weight ranges
For a 5 ft 3 woman, the healthy weight range in stones and pounds is approximately 7 st 10 lb to 10 st 5 lb. This is derived from the BMI range applied to that height (NHS (health service)).
Conversion to stones and pounds
Use the conversion methods above to translate your weight in kg into stones and pounds. Then compare with the healthy ranges provided by the NHS. For example, a weight of 63 kg (9 st 13 lb) at 5 ft 3 falls within the healthy band.
Bottom line: The NHS BMI chart is the gold standard for UK adults. Convert your weight to stones and pounds using the methods here, then check your height‑appropriate range. For most people, staying within 18.5–24.9 BMI is the practical target.
Confirmed facts
- 1 stone = 14 lb = 6.35029318 kg (international agreement) (The Calculator Site (conversion resource))
- NHS uses stone/pounds for body weight in UK clinics (NHS Scotland (health authority))
What’s unclear
- Exact origin of the stone unit (various historical definitions) (Wikipedia (reference))
- Rounding conventions vary between NHS trusts and online calculators, potentially causing small discrepancies in recorded weight
“BMI is a measure of whether you’re a healthy weight for your height.”
“The stone or stone weight is an English and imperial unit of mass.”
For a UK patient moving between digital health apps and the GP surgery, the ability to switch between kilograms and stones is not just convenience – it’s a safety net. Without accurate conversion, a small rounding error in a weight‑based drug dose can have real consequences. The trade‑off is simple: invest two minutes to learn the formula, or keep a printed NHS chart handy. For UK adults, the choice is clear: master the kg‑to‑stone conversion, or risk confusion every time you step on the scales.
For a detailed breakdown of the formulas and NHS charts, refer to this comprehensive conversion guide that covers all common weight conversions.
Frequently asked questions
How many kilograms are in a stone?
One stone equals exactly 6.35029318 kilograms.
What is the formula to convert stone to kg?
Multiply the number of stones by 6.35029318 to get kilograms.
Is the stone unit used in the United States?
No, the stone is primarily used in the United Kingdom and Ireland for body weight. The United States uses pounds alone.
Why do Britons use stone for body weight?
The stone has been a traditional unit of mass in the British Isles for centuries, and it remains the standard for personal weight measurement in daily life, though food packaging uses kilograms.
What is 65 kg in stones and pounds?
65 kg is approximately 10 stone 3.3 pounds (10 st 3.3 lb).
How do I convert stone to kg without a calculator?
Approximate by multiplying the stone value by 6.35. For example, 11 stone × 6.35 = 69.85 kg – close enough for most estimates.
What weight is 11 stone in kg?
11 stone equals 69.853 kg (using the exact factor).