Maths & geometry Australia
Kg to Stone Converter Australia
Enter a weight in kilograms to see it in stone and pounds, or enter stone and pounds to see kilograms. The conversion uses the exact definition of the pound, and the result also shows the total in pounds and ounces.
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Result
—Kilograms
—
Pounds
—
Stone and pounds
—
Ounces
—
The working
How many stone and pounds is 80 kg?
Divide the kilograms by 0.45359237 to get pounds, then divide by 14 for stone. 80 kg is 176.4 pounds, which is 12 stone 8.4 pounds. To go the other way, multiply pounds by 0.45359237; one stone is 14 pounds or about 6.35 kilograms.
Imperial and metric weights
The metric system is the legal standard here, and kilograms are used for health records, food labels and postage. Imperial units survive in everyday talk, in older family records and in some sports. A baby's birth weight is often given in both kilograms and pounds and ounces, and a quick conversion helps relatives overseas.
Rounding and accuracy
Stone and pounds are usually quoted to the nearest pound, and kilograms to the nearest tenth. The calculator shows more decimals so you can see the exact figure, but for most purposes rounding to a pound or half a kilogram is fine. Do not round before converting if you need to compare precisely.
For body measurements, see the BMI calculator.
How this is calculated
The rule, step by step, so you can check any figure by hand.
1 pound = 0.45359237 kilograms (exact)1 stone = 14 pounds = 6.35029318 kilogramspounds = kilograms ÷ 0.45359237stone = whole 14s in the pounds; the rest are poundsounces = pounds × 16
Australians weigh themselves in kilograms, but stone and pounds are still used by people who grew up with imperial units, by migrants from the UK and Ireland, and in baby birth weights. The pound has been defined as exactly 0.45359237 kilograms by international agreement, so the conversion is exact and the only rounding is in the display.
A stone is 14 pounds, a unit used for body weight in the UK and Ireland but not in the United States, where weights are given in pounds only. If you are comparing a weight with an American source, use the pounds figure.
A worked example
A body weight of 80 kg.
- Pounds176.4
- Stone and pounds12 st 8.4 lb
- Ounces2,822
- 1 stone in kg6.35
12 stone 8.4 pounds.
Use the pounds figure for American sources.
Common weights
Ten stone is about 63.5 kg, twelve stone about 76.2 kg and fifteen stone about 95.3 kg. One kilogram is a little over 2.2 pounds, and 100 pounds is about 45.4 kg.
What it leaves out
Troy and other special pound units, and the apothecary system, are different and are not used here.
What this calculator does not do
- Avoirdupois pounds only
- Display rounded
- Weights are not health advice
- General information
Common questions
How many pounds are in a kilogram?
About 2.2046.
How many kilograms are in a stone?
About 6.35.
Is the conversion exact?
Yes, the pound is defined as exactly 0.45359237 kg.
Why use stone?
It is a habit from the UK and Ireland for body weight.
How do I convert pounds to stone?
Divide by 14.
Where these numbers come from
- BIPM — the International System of Units (SI) The metric base for the exact definition of the pound and inch
- National Measurement Institute Australia's authority on measurement units and standards
Method last reviewed 2026-10-28 This calculator uses fixed rules rather than rates that change, and its method is re-checked against the sources above at least once a year. Out of date? Tell us and we will fix it.
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