Stones to Kilograms Converter
A patient in a Glasgow general practitioner's surgery steps onto the digital scale that displays both stones-and-pounds and kilograms, reads off thirteen stone four — the number she has thought of as her body weight her entire life — and watches the metric column show 84.4 kg, which is what the doctor will type into the electronic medical record. Stones-to-kilograms is the conversion that defines British and Irish weight medicine: the stone (always 14 pounds, never anything else) is the colloquial body-weight unit that older patients use to describe themselves to clinicians who must record everything in metric for the NHS database. It runs through cardiology referrals, weight-loss program intake forms, BMI calculations in private gyms, and every conversation between a parent describing a teenager's growth spurt in stones and a paediatrician asking for the kilo number to plot on the WHO chart.
Calculator
1 × 6.35029318 = 6.3503
Formula
Multiply stones by 6.35029318 to get kilograms. One stone equals exactly 14 avoirdupois pounds, and one pound equals exactly 0.45359237 kg, so the precise factor is 14 times 0.45359237. For mental math, the rough multiplier is 6.35 (or 6.4 for a faster but less accurate estimate). When the input includes a fractional stone in the British format (10 stone 7 lb, for example), convert the pounds-fraction to a decimal stone (7/14 = 0.5) so 10 stone 7 lb is 10.5 stone, then multiply by 6.35 to get 66.7 kg. Most British medical scales now display the kilogram value directly so the patient and clinician can both read the same number.
Where You'll Use This
British and Irish medical record-keeping is the largest professional use of this conversion. NHS clinics must enter patient weight in kilograms for the central electronic medical record, but patients overwhelmingly self-describe in stones (or stones-and-pounds for finer precision). Doctors and nurses become bilingual translators, asking for the stone figure and entering the kilo equivalent. Weight-loss programs in the UK like Slimming World and WeightWatchers UK report progress in stones because that's the unit members emotionally connect with — losing two stone (12.7 kg) sounds more meaningful than losing twelve and three-quarters kilograms. British media reporting on celebrity weight changes, athlete weigh-ins for boxing and rugby, and royal family baby announcements all use stones for older audiences. International events held in the UK that import American or Asian competitors require constant conversion between the metric kilogram (international standard) and the stone (local press idiom). Even pet weight conversations in British veterinary practice frequently use stones for large dogs and pounds for cats, with the metric figure recorded for the file.
Reference Table
| From (Stones) | To (Kilograms) |
|---|---|
| 1 | 6.3503 |
| 1.5 | 9.5254 |
| 2 | 12.7006 |
| 3 | 19.0509 |
| 4 | 25.4012 |
| 5 | 31.7515 |
| 6 | 38.1018 |
| 7 | 44.4521 |
| 8 | 50.8023 |
| 8.5 | 53.9775 |
| 9 | 57.1526 |
| 9.5 | 60.3278 |
| 10 | 63.5029 |
| 10.5 | 66.6781 |
| 11 | 69.8532 |
| 11.5 | 73.0284 |
| 12 | 76.2035 |
| 12.5 | 79.3787 |
| 13 | 82.5538 |
| 13.5 | 85.729 |
| 14 | 88.9041 |
| 15 | 95.2544 |
| 16 | 101.6047 |
| 18 | 114.3053 |
| 20 | 127.0059 |
A Bit of History
The stone is one of the oldest English weight units, originally varying by trade — a wool stone weighed differently from a butcher's stone, which weighed differently from a glass stone — until the 1389 statute of Richard II tried to standardize them at 14 pounds for wool. The 14-pound stone gradually displaced the regional alternatives over the next four centuries and was permanently fixed at 14 lb by the 1835 Weights and Measures Act. Notably, the United States never adopted the stone for body weight despite sharing the broader avoirdupois system — Americans still describe body weight in pounds while Britons and Irish people overwhelmingly use stones-and-pounds. This makes the stone the single largest cultural-measurement gap between American and British everyday life, since neither side instinctively understands the other's number until they convert through metric.
FAQ
How many kg is 10 stone?
Ten stone equals 63.50 kilograms. This is a common British adult body-weight figure for women and frequently appears in fitness and dieting articles in UK lifestyle publications.
What is 12 stone in kg?
Twelve stone equals 76.20 kilograms — a common adult male body-weight reference and a number that medics recognize instantly from BMI calculations done all day in primary-care surgeries.
Why do British people still use stones?
Cultural inertia — body weight in stones-and-pounds was the standard for generations and remains the colloquial unit despite the UK's official metric adoption decades ago. Newer generations use kilograms more readily but anyone over forty almost universally still thinks in stones for personal weight.
How do I convert stones and pounds to kg?
First combine the stones-and-pounds into a decimal stone (divide pounds by 14 and add to whole stones). Then multiply by 6.35. Example: 11 stone 7 lb is 11 + 7/14 = 11.5 stone, multiplied by 6.35 gives 73.03 kg.