Kg to Stones Converter (kg → st & st+lb)

Convert kilograms to stones and pounds instantly with accurate formulas precision control and friendly rounding modes. Supports mixed inputs batch tables history CSV export and shareable links. Made mobile first with Bootstrap five accessible keyboard friendly fast and trustworthy. For health fitness shipping and tasks this converter saves time reduces mistakes and boosts confidence.

Direct

Kilograms → Stones & Pounds

1 st = 6.35029318 kg = 14 lb
Use decimals or locale commas (e.g., 72,5). Negative values not allowed.
Tip: Type “11 st 5.5 lb” or “11st 5lb” into Stones & Pounds below to auto-convert back to kilograms.
Reverse

Stones & Pounds → Kilograms

You can paste “11 st 5.5 lb” here, we’ll parse it.

# kg stones (decimal) stones pounds

kg stones (decimal) st lb

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About the conversion

Use these exact constants: 1 st = 6.35029318 kg and 1 st = 14 lb. One pound equals 0.45359237 kg. To convert kilograms to stones, divide kilograms by 6.35029318. The integer part is stones; multiply the fractional remainder by 14 to get pounds.

Formulas
stones = kg / 6.35029318
st = floor(kg / 6.35029318)
lb = (kg / 6.35029318 − st) × 14
kg = st × 6.35029318 + lb × 0.45359237
Rounding

Choose a rounding mode to match your use case:

  • Half‑up: rounds to nearest; 0.5 goes up.
  • Floor: always rounds down.
  • Ceiling: always rounds up.
Disclaimer: Informational only; not medical advice.
Result

Output

Last updated:
Stones (decimal)
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Stones + Pounds
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Kilograms (from st+lb)
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History (last 10)

    How This Kg ⇄ Stones Converter Works (With Exact Formulas)

    This tool is designed for accuracy, clarity, and speed. It uses the internationally agreed constants 1 stone = 6.35029318 kilograms and 1 stone = 14 pounds, with 1 pound = 0.45359237 kilograms. The calculator accepts kilograms and produces both decimal stones and the popular split format “stones + pounds.” It also works in reverse: enter stones and pounds to obtain kilograms. All computations run instantly in your browser for a smooth, private, and accessible experience on desktop and mobile.

    Core Formulas

    To convert kilograms → stones (decimal), divide kilograms by 6.35029318. The integer part of that result is the stones, and the fractional part multiplied by 14 gives the pounds: 

    stones_decimal = kg / 6.35029318
st = floor(stones_decimal)
lb = (stones_decimal − st) × 14

    For the reverse direction, multiply stones by 6.35029318 and add pounds times 0.45359237: 

    kg = st × 6.35029318 + lb × 0.45359237

    Rounding & Precision

    Results can be shown with 0–4 decimal places and with three rounding modes. This is useful for health, fitness, sports, or shipping scenarios where you need predictable rounding. Choose the mode that aligns with your context (for example, “floor” to avoid overstating weight). A quick comparison for a single input highlights how modes differ:

    Input Mode Decimal Stones Stones + Pounds
    72.57 kgHalf-up11.43 st11 st 5.99 lb
    72.57 kgFloor11.43 st11 st 5.00 lb
    72.57 kgCeiling11.43 st11 st 6.00 lb

    Constants at a Glance

    QuantityExact Value
    1 stone in kilograms6.35029318 kg
    1 stone in pounds14 lb
    1 pound in kilograms0.45359237 kg

    Worked Examples

    Below are typical conversions showing both the decimal and split formats:

    kg stones (decimal) st lb (2 dp)
    101.5718.05
    6510.24103.30
    72.511.43116.00
    8012.60128.38
    15023.62238.69

    Batch, Range & Sharing

    The Batch panel lets you paste many kilogram values (one per line or CSV) and export the resulting table to CSV, or print to PDF. The Range panel generates a sequence (e.g., 40–120 kg by 2) with a mini chart, ideal for planning or educational use. When you adjust settings, the page updates a shareable permalink so you can bookmark your preferences or embed the tool elsewhere.

    Reliability, Accessibility & Notes

    The interface is built with Bootstrap 5 for responsiveness, clear labels, and keyboard support. The live result region uses ARIA so screen‑reader users receive updates without extra navigation. All math runs locally in your browser; no data is sent to a server. Finally, remember that units in stones are most common in the UK and Ireland—if you need a different unit system, switch to kilograms and pounds directly or use our kg ⇄ lb converter. This content is informational only and not medical advice.

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    Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.