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Stone to Kilograms Converter

Everyday

Convert body weight from stone (st) to kilograms (kg), pounds, or grams instantly — the UK and Ireland's standard weight unit, converted with exact precision.

Reviewed by the thecalcu.com team · Last updated 30 July 2026

🇬🇧This tool is specific to United Kingdom
From
To
All conversionsfor 1 Stone (st)
Stone (st)1
Kilograms (kg)6.3502932
Pounds (lb)14
Grams (g)6350.2932

What is a Stone to kg?

A Stone to Kilograms Converter translates body weight between stone (st), the traditional unit still used for everyday weight in the UK and Ireland, and kilograms (kg), the metric standard used in most medical, scientific, and international contexts. One stone is defined as exactly 14 pounds, giving a precise conversion factor of 6.35029318 kilograms, with no approximation involved.

While the general Weight Converter already includes stone among its many unit options, this focused tool targets the specific "stone to kg" conversion directly, the same high-volume, exact-match search pattern already used by the Miles to Kilometers Converter and Pounds to Kilograms Converter for similarly common single-conversion queries.

Why Use a Stone to Kilograms Converter?

UK bathroom scales, casual conversation, and even some medical contexts still describe body weight in stone, while international health apps, medical dosing calculations, and most of the rest of the world use kilograms exclusively. Converting between the two, especially when a UK-based scale reads in stone but an app or form expects kg, requires an exact, quick conversion.

Two concrete situations this solves: converting your UK bathroom scale's stone reading into kg for a health app or international medical form that only accepts metric weight, and converting a kg-based weight goal or medical dosing reference back into the familiar stone figure for everyday tracking.

Who Should Use This Converter?

  • UK and Irish residents converting their body weight from the traditional stone reading to kg for medical forms, fitness apps, or international travel documentation.
  • Healthcare workers in the UK cross-referencing patient weight between stone (commonly used in conversation) and kg (used in clinical dosing calculations).
  • Fitness and weight-loss trackers converting between stone-based weight goals and kg-based app tracking.
  • International travellers and expats unfamiliar with the stone unit, converting UK weight references into the kg they're used to.
  • Students and researchers working with historical UK weight data recorded in stone.

What Insights Does the Stone to Kilograms Converter Give You?

Converting Stone to Kilograms (kg) gives you the precise metric weight figure needed for medical calculations, international forms, or apps that require kg input. Converting to Pounds (lb) or Grams (g) gives you additional reference points, pounds is useful for US-based comparisons, since the US also doesn't primarily use stone, while grams is useful for very precise small-scale measurements.

Because the stone-to-kg relationship is an exact, internationally fixed standard, every value this converter produces is precise to the decimal places shown, with no rounding uncertainty to account for.

How to use this Stone to kg calculator

  1. Select your starting unit from the From dropdown, Stone (st), Kilograms (kg), Pounds (lb), or Grams (g).
  2. Enter your value, such as 11 for 11 stone.
  3. Select your target unit from the To dropdown, such as Kilograms (kg).
  4. Read the converted result, which updates instantly.
  5. Use the swap (⇅) button to reverse the conversion direction, for example, converting a kg figure back into stone.
  6. For a compound stone-and-pounds value (like "11 stone 4 lbs"), convert the pounds portion separately and add it to the stone conversion for full precision.

Formula & Methodology

All units convert through kilograms as the base unit, using the exact internationally defined relationship between stone and the kilogram:

Kilograms = Stone × 6.35029318  |  Stone = Kilograms ÷ 6.35029318

This factor comes from the exact definitions: 1 stone = 14 pounds, and 1 pound = exactly 0.45359237 kilograms (14 × 0.45359237 = 6.35029318).

Worked example: Converting 13 stone to kilograms, 13 × 6.35029318 ≈ 82.55 kg. Converting that figure back confirms the round trip: 82.55 ÷ 6.35029318 ≈ 13.0 stone.

Frequently Asked Questions

1 stone equals exactly 6.35029318 kilograms, since a stone is defined as 14 pounds and 1 pound equals exactly 0.45359237 kilograms. This is a fixed international definition, so the conversion involves no rounding or approximation.
Kilograms = Stone × 6.35029318, and conversely, Stone = Kilograms ÷ 6.35029318. This converter applies that exact factor, so 10 stone converts to precisely 63.5029318 kg.
10 stone equals 63.5 kg (63.5029318 kg to full precision), calculated as 10 × 6.35029318. This is a commonly searched conversion since 10 stone is a frequent reference point for body weight in the UK and Ireland.
Stone has been the traditional unit for measuring human body weight in the UK and Ireland for centuries, and despite the UK's broader adoption of the metric system, stone remains the everyday standard for describing personal body weight, most UK bathroom scales, medical records, and casual conversation still use stone rather than kg. Kilograms are more commonly used in scientific, medical dosing, and most other UK measurement contexts.
Select Stone (st) as your From unit, enter your weight in stone (such as 12), and select Kilograms (kg) as your To unit. The tool calculates the exact kilogram equivalent instantly, 12 stone converts to approximately 76.2 kg.
Stone is commonly expressed with an additional pounds figure for precision, such as '11 stone 4 lbs' rather than a decimal stone value, since 1 stone equals 14 pounds. To convert a compound value like this to kg, first convert the pounds portion to a decimal stone fraction (4 ÷ 14 ≈ 0.286), add it to the whole stone figure, then apply the stone-to-kg conversion.
Healthy weight ranges vary significantly by height, sex, and build, typically calculated using BMI (Body Mass Index) rather than weight alone, a general population range often cited is roughly 8-16 stone (about 51-102 kg) across different heights, but this is not a substitute for a proper BMI or health assessment. This converter provides unit conversion only; consult a BMI calculator or healthcare professional for weight health assessments.
Yes, select Kilograms (kg) as your From unit, enter the kg value, and select Stone (st) as your To unit, or simply use the swap (⇅) button to reverse the stone-to-kg conversion direction. Both directions use the same exact 6.35029318 conversion factor.
The [Weight Converter](/weight-converter/) already includes stone as one of many selectable units alongside kg, pounds, ounces, and more, but this dedicated Stone to Kilograms Converter targets the specific, extremely high-volume 'stone to kg' search query directly with a focused two-click conversion. Use this tool for quick stone-kg conversions and the general Weight Converter when working across many different weight units.
Half a stone (7 lbs) equals approximately 3.175 kg, calculated as 0.5 × 6.35029318. Half-stone increments are commonly used when discussing weight loss or gain goals in the UK, such as 'losing half a stone.'
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