Easily convert Kilograms to Stones and Pounds (st/lb).
If you've ever stepped on a set of digital scales that reads out in kilograms and had absolutely no idea what that number means in stone, you're in good company. Most bathroom scales sold in the UK and Ireland today default to kilograms, yet the way we actually talk about body weight - at the doctor's, at the gym, or just catching up with family - is still almost always in stone and pounds. The calculator above does the maths for you in real time, but this guide walks through exactly how to use it, the formula behind it, and handy reference tables for the weights people search for most.
How to Use This Kg to Stone Converter
The calculator is built to do one job well: take a weight in either kilograms or stone and pounds, and hand you back an accurate result in the other unit - without forcing you to scroll through adverts or wait for a page to reload. Here's exactly what each part of the tool does.
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Pick your direction Right under the title you'll see two tabs - "KG → St / lb" and "St / lb → KG". Tap whichever matches what you're starting with. Each tab remembers its own quick-select chips, so switching back and forth doesn't lose your place.
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Enter your weight In the KG tab, type your number directly into the box, drag the slider, or use the − / + buttons for fine adjustments. There's no upper limit on what you can type - the slider even stretches itself automatically if you enter a number above its current range. In the Stone/lb tab, you get two separate fields — one for whole stone, one for pounds - so you can enter something like "11 st 4 lb" exactly as you'd say it out loud.
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Use a quick preset (optional) Below the input, common weights are laid out as tappable chips 45-150 kg on the metric side, 8-20 stone on the imperial side. Handy if you're just after a rough reference rather than typing your exact figure.
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Press Convert Hit the amber Convert button and the page smoothly scrolls down to a full results panel. Nothing calculates or clutters the screen until you actually ask for it.
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Read the full breakdown Converting kg to stone gives you: stones only (as a decimal), stones and pounds combined, stones/pounds/ ounces, total pounds, total ounces, and the original value repeated in grams. Converting stone/lb to kg gives you kilograms only, kilograms and grams, total grams, and total stones as a decimal - everything you're likely to need for a medical form, a gym log, or a shipping label.
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Adjust the precision By default, results show to 4 decimal places for accuracy, but a small dropdown in the results panel lets you switch to 2, 6, 8, 10, or even 15 decimal places if you need scientific-level precision.
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Copy or reset The Copy result button copies a plain-text summary straight to your clipboard - useful for pasting into a form or a message. Reset clears everything back to the defaults and scrolls you back to the top, ready for the next conversion.
The Kg to Stone Formula (and why it isn't a round number)
Unlike converting kilometres to miles or Celsius to Fahrenheit, converting kilograms to stone involves an extra step, because a stone doesn't divide evenly into a whole number of kilograms. Here's the maths broken down plainly:
- 1 stone = 6.35029318 kilograms (this is the exact, internationally agreed figure)
- 1 kilogram = 2.20462262 pounds
- 1 stone = 14 pounds
To convert kilograms into stone and pounds by hand:
- Multiply your kilograms by 2.20462262 to get the total weight in pounds.
- Divide that number by 14. The whole number is your stone figure.
- Take what's left over after the whole number (the remainder) - that's your pounds figure.
Kg to Stone and Pounds - Quick Reference Table
For the weights people look up most often, here's a ready-made reference table. If your exact figure isn't listed, the calculator above will give you the precise result instantly.
| Kilograms | Stone & Pounds | Total Pounds |
|---|---|---|
| 40 kg | 6 st 4.2 lb | 88.2 lb |
| 45 kg | 7 st 1.2 lb | 99.2 lb |
| 50 kg | 7 st 12.2 lb | 110.2 lb |
| 55 kg | 8 st 9.3 lb | 121.3 lb |
| 60 kg | 9 st 6.3 lb | 132.3 lb |
| 65 kg | 10 st 3.3 lb | 143.3 lb |
| 70 kg | 11 st 0.3 lb | 154.3 lb |
| 75 kg | 11 st 11.3 lb | 165.3 lb |
| 80 kg | 12 st 8.4 lb | 176.4 lb |
| 85 kg | 13 st 5.4 lb | 187.4 lb |
| 90 kg | 14 st 2.4 lb | 198.4 lb |
| 95 kg | 14 st 13.4 lb | 209.4 lb |
| 100 kg | 15 st 10.5 lb | 220.5 lb |
| 110 kg | 17 st 4.5 lb | 242.5 lb |
| 120 kg | 18 st 12.6 lb | 264.6 lb |
| 130 kg | 20 st 6.6 lb | 286.6 lb |
| 140 kg | 22 st 0.6 lb | 308.6 lb |
| 150 kg | 23 st 8.7 lb | 330.7 lb |
Stone to Kg - Quick Reference Table
Going the other way - from stone to kilograms - here's the same idea in reverse:
| Stone | Kilograms | Total Pounds |
|---|---|---|
| 6 st | 38.1 kg | 84 lb |
| 7 st | 44.5 kg | 98 lb |
| 8 st | 50.8 kg | 112 lb |
| 9 st | 57.2 kg | 126 lb |
| 10 st | 63.5 kg | 140 lb |
| 11 st | 69.9 kg | 154 lb |
| 12 st | 76.2 kg | 168 lb |
| 13 st | 82.6 kg | 182 lb |
| 14 st | 88.9 kg | 196 lb |
| 15 st | 95.3 kg | 210 lb |
| 16 st | 101.6 kg | 224 lb |
| 18 st | 114.3 kg | 252 lb |
| 20 st | 127.0 kg | 280 lb |
Kg to Stone at a Glance (Visual Chart)
Because the relationship between kilograms and stone is a straight, constant ratio, it plots as a perfectly straight line - the chart below shows how stone climbs steadily as kilograms increase from 40 kg to 150 kg.
Why Is Body Weight Still Measured in Stone in the UK?
It's a fair question - the UK officially adopted the metric system decades ago, and every scale in every GP surgery and gym now defaults to kilograms. Yet ask most British or Irish adults their weight and they'll answer in stone and pounds without a second thought. The stone survives mainly out of habit and familiarity: a person's healthy adult body weight typically falls somewhere between 7 and 20 stone, a range that's easy to hold in your head, whereas the equivalent in kilograms (roughly 45–130 kg) feels less intuitive to people who grew up using the older system. It's the same reason many people still give their height in feet and inches even though metres and centimetres are the official standard.
Frequently Asked Questions
How many stone is 1 kg?
One kilogram is approximately 0.157473 stone. In other words, it takes roughly 6.35 kg to make up a full stone.
How do you convert kg to stone and pounds by hand?
Multiply your weight in kilograms by 2.20462 to get pounds, then divide that figure by 14. The whole number is your stone count, and whatever is left over is your pounds. For example, 65 kg × 2.20462 = 143.3 lb, and 143.3 ÷ 14 = 10 stone with 3.3 lb remaining.
What is 1 stone in kg exactly?
1 stone equals exactly 6.35029318 kilograms. This is the internationally recognised conversion figure used across the UK and Ireland.
How many pounds are in a stone?
There are always 14 pounds in a stone - this part of the imperial system hasn't changed and applies regardless of what you're weighing.
Is this kg to stone converter accurate?
Yes. The calculator uses the exact conversion factor of 2.20462262185 pounds per kilogram, and you can increase the decimal precision up to 15 places in the results panel if you need scientific-level accuracy.
Can I convert stone back to kg with the same tool?
Yes - switch to the "St / lb → KG" tab, enter your stone and pounds, and press Convert. The results panel will show kilograms, kilograms and grams, and total grams.
Conversion factors used on this page: 1 stone = 6.35029318 kg; 1 kg = 2.20462262185 lb; 1 stone = 14 lb. These are standard, internationally recognised imperial-to-metric conversion values.
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