Stone to Kilograms Converter
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Other tools you may find usefulStone to kilogram converter - British system of mass converter
Weight and measurement systems vary greatly depending on historical traditions and geographical location. Although most of the world uses the metric system, in which the basic unit of mass is the kilogram (kg), traditional imperial units are still widely used in English-speaking countries (particularly Great Britain and Ireland). One of the most specific units used there to determine human body weight is **stone** (abbreviation **st**). When asked about his weight, a Briton will almost never give the result in kilograms or just pounds - he will say, for example, that he weighs "11 stones and 4 pounds". Our free **stone to kilograms online converter** is a fast mathematical tool that allows you to quickly and precisely convert stones and pounds to kilograms and vice versa.
Thanks to this, you will easily understand British weight indicators in medical publications, training programs and correctly calculate your body weight when traveling or working abroad.
Relationships and definitions of units of mass in the imperial system
To correctly convert imperial units, you need to know their internal mathematical relationships. The table below shows the definitions and exact conversion factors for the metric system:
| Name of the unit | International abbreviation | Value in other imperial units | Exact value in grams / kilograms | Approximate value in the metric system |
|---|---|---|---|---|
| Pound | lb / lbs | 1 lb = 16 oz (ounce) | 453.59237 g | Approx. 0.454 kg |
| Stone | st | 1 st = 14 lbs | 6350.29318 g | Approx. 6.35 kg |
| Kilogram (Metric) | kg | 1 kg ≈ 2.2046 lbs | 1000.0 g | 1 kg ≈ 0.157 st |
Stone conversion formulas, lbs and kg
The conversion between these systems is based on constant physical multipliers. The following formulas are used for calculations:
Conversion from stones to kilograms (kg)
If the weight is given in stones only, the formula is:
$$\text{Weight (kg)} = \text{st} \times 6.35029318$$
If the weight is given in stones ($st$) and pounds ($lbs$):
$$\text{Weight (kg)} = (\text{st} \times 14 + \text{lbs}) \times 0.45359237$$
Example: Let's convert the weight of 11 st 4 lbs into kilograms: $$\text{Weight (kg)} = (11 \times 14 + 4) \times 0.45359237 = (154 + 4) \times 0.45359237 = 158 \times 0.45359237 \approx 71.67 \text{ kg}$$
Conversion from kilograms (kg) to stones and pounds (st + lbs)
To convert kilograms to the imperial system, we first divide the weight by 6.35029318. The integer part of the result is the number of stones ($st$). Multiply the remaining fraction by 14 to get the number of pounds ($lbs$):
$$\text{Number of stones (st)} = \lfloor\text{kg} / 6.35029318\rfloor$$
$$\text{Number of pounds (lbs)} = \left(\frac{\text{kg}}{6.35029318} - \text{st}\right) \times 14$$
Example: Let's convert 80 kg to stones and pounds:
- Division: $80 / 6.35029318 \approx $12,597
- Number of stones: **12 st**
- Fraction: $0.597 \times 14 \approx 8.36$ lb
- Final result: **12 st 8.4 lbs**
How to use the scale converter? User manual
Our converter allows for two-way weight calculations:
- Select conversion mode:Select whether you want to convert "Stone to Kilograms" or "Kilograms to Stone".
- Enter data:
- For imperial mode, enter the number of stones (fieldStone) and optionally the remainder in pounds (fieldPounds).
- For metric mode, simply enter your weight in kilograms (fieldKilograms).
- Click "Convert":The calculator will display the exact result in the new unit along with the written formula and rounding to two decimal places.
Frequently asked questions (FAQ)
How many kilograms does one stone weigh exactly?
One British stone is exactly **6.35029318 kilograms** (or 6350.29 grams). In everyday, approximate mental calculations, it can be assumed that 1 stone is approximately 6.35 kg.
Where and why is the unit of weight stone (st) still used?
This unit is used almost exclusively in the UK and Ireland to unofficially measure people's body weight. It is a remnant of the old imperial system. Although kilograms have been introduced in official medicine and trade in the UK, the British are culturally accustomed to "stones" just as Poles are to centimeters and kilograms.
How to convert weight in st and lbs to kilograms?
First, multiply the number of stones by 14 (since 1 st = 14 lbs) and add the remaining number of pounds to this, giving the total weight in just pounds. Then multiply this value by the conversion factor 0.4536, which will give the final result in kilograms.
What is the relationship between stone, pound and kilogram?
A stone is a superior unit to a pound - 1 stone consists of exactly 14 pounds. The kilogram, in turn, is an intermediate unit: 1 pound is approximately 0.45 kg, and 1 stone is approximately 6.35 kg. This means that a kilogram is more than twice as heavy as a pound, but more than six times lighter than a stone.
How to convert kilograms to stones and pounds?
Divide the weight in kg by 6.35. The integer part of the result is the number of stones. Multiply the fractional remainder by 14 to find the remaining pounds. For example, a weight of 70 kg divided by 6.35 gives 11.02. You get 11 stones, and the fraction 0.02 * 14 gives approximately 0.3 pounds - or 11 st 0.3 lbs.