The kg to stone conversion calculator quickly translates a weight in kilograms into the stone and pound units commonly used in the UK and Ireland. Whether you are checking a bathroom scale reading, tracking a weight-loss goal, or comparing a nutrition plan written in another country, this tool gives you an exact result in seconds.
Enter the number of kilograms, choose how many decimal places you want, and press Convert to Stones. The result shows the decimal value in stones, the more familiar broken-down form in whole stones and pounds, and the total number of pounds. Quick-fill buttons for common body weights make it convenient for diet tracking and fitness check-ins.
Nutrition and health professionals, gym-goers, and anyone following a weight-management program can use this converter to avoid confusion between metric and imperial units. The calculations follow the exact definitions used by international standards: one pound equals 0.45359237 kilograms, and one stone equals 14 pounds.
⚖️ Kilograms to Stones
Enter a weight in kilograms and get the equivalent in stones and pounds.
Step-by-Step Guide
This converter is built for speed, but it also gives you enough detail to understand the result. Start by typing a weight in kilograms into the first field. The field accepts decimal values, so 72.4 kg works just as easily as 75 kg. If you would rather avoid typing, the quick-fill buttons below the input add common body-weight values such as 60 kg, 70 kg, 80 kg, 90 kg and 100 kg with a single click.
- Enter the weight in kilograms in the input box.
- Choose a rounding level: two decimal places is best for precise numbers, one decimal place is fine for everyday conversation, and whole stones are useful when you only need a rough figure.
- Press Convert to Stones. The result panel appears below the button.
- Read the three lines: the exact decimal value in stones, the practical whole-stone-and-pound version, and the total weight in pounds.
The conversion is instant and uses the official relationship between kilograms, pounds and stones, so you can rely on it for diet tracking, gym records, medical notes or simple household use.
Why the Numbers Work the Way They Do
The stone is a British imperial unit of mass equal to exactly 14 pounds. The pound is defined by international agreement as exactly 0.45359237 kilograms. Because 14 × 0.45359237 = 6.35029318, one stone is therefore exactly 6.35029318 kilograms. Converting kilograms to stones is simply a matter of dividing by that number.
For a worked example, take 70 kg. Dividing 70 by 6.35029318 gives 11.023 stones. The whole-number part is 11 stones. The fractional part, 0.023 of a stone, equals 0.023 × 14 = 0.32 pounds, which rounds to zero pounds. So 70 kg is commonly written as 11 stone and 0 lb, or simply 11 stone.
Most scales in the UK and Ireland display both stones and pounds, which is why the broken-down result feels more natural than a decimal number of stones. The calculator shows both forms so you are never left guessing which number matters.
Kilograms to Stones Quick Reference
The table below is handy when you do not have the calculator open. Values are rounded to the nearest pound in the stones-and-pounds column.
| Kilograms | Decimal Stones | Stones & Pounds |
|---|---|---|
| 50 kg | 7.87 st | 7 st 12 lb |
| 60 kg | 9.45 st | 9 st 6 lb |
| 70 kg | 11.02 st | 11 st 0 lb |
| 80 kg | 12.60 st | 12 st 8 lb |
| 90 kg | 14.17 st | 14 st 2 lb |
| 100 kg | 15.75 st | 15 st 10 lb |
| 110 kg | 17.32 st | 17 st 4 lb |
| 120 kg | 18.90 st | 18 st 13 lb |
To use the table in reverse, remember that one stone equals 6.35 kg and one pound equals 0.454 kg. For example, 12 st 8 lb converts back to 12 × 6.35029318 + 8 × 0.45359237 = 79.83 kg, which is close to 80 kg.
Practical Tips for Everyday Use
Weigh yourself at roughly the same time of day and on the same surface for consistent body-weight readings. Morning measurements before breakfast tend to be the most comparable because food and drink can move the number by a kilogram or more across a day. If you are using the result for nutrition planning, focus on long-term trends rather than day-to-day changes.
When you are following a recipe or a macro plan that gives weights in pounds, the total pounds line is the one to use. If you are checking a BMI chart, convert your weight to decimal stones or total pounds first, then compare with the chart's units. Most modern BMI ranges are displayed in either metric or imperial units, and mixing them is a common source of error.
Frequently Asked Questions
How many kilograms are there in one stone? Exactly 6.35029318 kilograms. Many people round this to 6.35 kg for quick mental arithmetic, but the exact figure comes from the international pound definition.
Why is a stone equal to 14 pounds? The stone originated as a local trade standard in England, and its size varied by commodity in the Middle Ages. Over time, a stone of 14 pounds became the accepted standard for personal body weight and was eventually formalised. The unit is still widely used in the UK and Ireland.
Is a stone the same in the US and the UK? Yes. Both countries recognise the same 14-pound stone for most commercial and personal use, although the unit is rare in the US. The legal definition of the pound is identical in both countries, so the conversion is the same everywhere.
Can I convert stones and pounds back to kilograms with this page? You can do the reverse calculation quickly: multiply the stone part by 6.35029318 and add the pounds part multiplied by 0.45359237. For example, 11 st 0 lb is 11 × 6.35029318 = 69.85 kg.
Further Reading
For more detail on the history and legal definition of the stone, see the Wikipedia article on the stone (unit). For guidance on healthy weight ranges and sustainable weight management, the NHS Healthy Weight section provides evidence-based advice for adults in the UK.
The National Institute of Standards and Technology (NIST) publishes the official SI conversion tables used by scientists and engineers in the United States; these underpin the same pound-to-kilogram factor used in this calculator.