Stones to kg Converter
Convert stones (and pounds) to kilograms and pounds.
How to use this stones to kg
- 1Enter your weight in whole stones in the first field.
- 2If your weight includes extra pounds beyond a whole stone (e.g., 11 stone 6 lbs), enter those pounds in the second field.
- 3The converter shows kilograms and total pounds instantly.
- 4For UK medical appointments, your weight may be recorded in both stones and kg — this converter bridges the two.
- 5For international gym memberships or fitness apps that use kg, convert your stone weight to kg for consistency.
- 6Reverse calculation: divide kg by 6.35029 to get stones (e.g., 75 kg ÷ 6.35 ≈ 11 stone 11 lbs).
How it's calculated
1 stone = 14 lbs. kg = (stones × 14 + lbs) × 0.453592.
About the Stones to kg
The stone is one of the most distinctive features of British and Irish measurement culture — a unit of body weight equal to 14 pounds that persists in everyday use despite the UK's official adoption of the metric system decades ago. While kilograms appear on medical records and scientific contexts, stones and pounds remain how most people in the UK and Ireland conceptualize and communicate their body weight.
The stone was standardized at 14 pounds by UK Parliament in 1835, resolving a prior period when different trades used stones of different sizes (a stone of wool was 14 lbs, a stone of glass was 5 lbs, etc.). The 14-pound stone became the universal standard for body weight and remained the common reference even as metric units were officially introduced. One stone = 14 pounds = 6.35029 kg.
The persistence of stones in UK health conversations is notable given how thoroughly the rest of the British measurement landscape has metricated. Distances are in miles, weights for goods are in kg and grams, temperatures are in Celsius — but when people discuss their own body weight, they reach for stones and pounds. The NHS has gradually shifted to using kg for clinical records, but GPs and patients still routinely converse in stones. UK fitness apps and bathroom scales almost universally offer stone display as an option for this reason.
Converting between stones and kilograms requires two steps: multiply stones by 14 to get pounds, then multiply pounds by 0.453592 to get kilograms. The combined factor is 14 × 0.453592 = 6.35029 — so 1 stone = 6.35029 kg exactly. This means dividing kg by 6.35 gives stones as a decimal, and multiplying the decimal portion by 14 gives the remaining pounds. For example, 80 kg ÷ 6.35 = 12.598 stone = 12 stone (0.598 × 14 = 8.37) ≈ 12 stone 8 lbs.
For anyone moving between the UK and countries that exclusively use kg, or for anyone dealing with UK friends and family members who express weight in stones, this converter provides the essential bridge. The key reference points: 10 stone = 63.5 kg = 140 lbs; 12 stone = 76.2 kg = 168 lbs; 14 stone = 88.9 kg = 196 lbs.
Frequently asked questions
How many kg is 11 stone?
11 stone × 14 lbs/stone = 154 lbs × 0.453592 = 69.85 kg. Common benchmarks: 8 stone = 50.8 kg, 10 stone = 63.5 kg, 11 stone = 69.85 kg, 12 stone = 76.2 kg, 14 stone = 88.9 kg.
How many stones is 70 kg?
70 kg ÷ 6.35029 = 11.02 stone = approximately 11 stone and 0 lbs (to the nearest pound). To convert kg to stones: divide by 6.35029 for stones, multiply the decimal part by 14 for remaining pounds.
Why do the UK and Ireland use stones for body weight?
The stone was part of the traditional English weight system and was officially 14 pounds by Act of Parliament in 1835. Despite the UK officially adopting metric in most contexts, body weight in everyday UK conversation remains in stones and pounds because older generations grew up with it, and changing social norms is much harder than changing official standards. Most UK bathroom scales still display stone, and NHS weight records historically used stones.
What is a healthy weight range in stones?
BMI is the standard health weight assessment. For a 5'9" (175 cm) person, healthy BMI (18.5–24.9) corresponds to approximately 8 stone 8 lbs – 11 stone 9 lbs (55–74 kg). For a 5'5" (165 cm) person: 7 stone 12 lbs – 10 stone 7 lbs (50–67 kg). Always consult a healthcare professional for weight assessments.
How many stone is 100 kg?
100 kg ÷ 6.35029 = 15.75 stone = 15 stone 10.5 lbs, approximately 15 stone 10 or 11 lbs.