Kilogram To Stone Converter

Verified by the ConvertReference Technical Standards Team

ConvertReference Technical Standards Team

All values and formulas are validated through our editorial review process and cross-checked against internationally recognized reference standards (NIST, BIPM, CODATA).

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Last reviewed: December 07, 2025

Conversion Factors

1 kilogram = 0.15747304441777 stone
1 stone = 6.35029318 kilogram

(Exact factors: 0.15747304441777 and 6.35029318)

Sources: NIST · BIPM

About This Kilogram And Stone Converter

Welcome to our quick calculator for kilograms and stones. It shows clear results for kilogram-to-stone calculations. Use the swap button to switch between kilograms and stones. A clean interface makes comparisons fast and easy for everyday use.

What Are Kilograms And Stones?

What Is A Kilogram?

Kilogram (kg) is the SI base unit of mass. It is defined by fixing the Planck constant h to exactly 6.62607015e-34 J s, linking kg to meters and seconds. System: International System of Units (SI). Symbol: kg. Example: a liter of water has mass about 1 kg.

What Is A Stone?

Stone (st) is a unit of mass used in the British Imperial system. It equals 14 pounds avoirdupois, exactly 6.35029318 kilograms. Therefore 1 st = 6.35029318 kg. Symbol: st. Real-world example: many adults weigh about 11 stone (154 pounds, ~70 kg).

When To Use Kilogram Vs Stone

Kilogram Usage

Kilogram is the SI unit of mass used worldwide in science, education, medicine, and commerce. It serves as the standard for weights in most countries and daily measurements in groceries and official data. Primary users include United States, United Kingdom, Canada, and Australia.

Stone Usage

Stone is used worldwide in buildings, facades, paving, and sculpture, as well as landscaping. Examples include the United Kingdom, India, China, and Brazil as places where stone is commonly used.

How To Convert Between Kilograms And Stones

Conversion Formulas

Kilogram to Stone:
kilogram × 0.15747304441777 = stone

Stone to Kilogram:
stone × 6.35029318 = kilogram

Step-by-Step Guide

Kilogram to Stone

Take your value in kilograms.
Multiply by 0.15747304441777.
The result is in stones.

Stone to Kilogram

Take your value in stones.
Multiply by 6.35029318.
The result is in kilograms.

Example: Convert 2 kilograms to stones.

Exact: 2 × 0.15747304441777 = 0.314946088835539 stones.
Rounded: approximately 0.314946 stones.

Example: Convert 5 stones to kilograms.

Exact: 5 × 6.35029318 = 31.7514659 kilograms.
Rounded: approximately 31.7515 kilograms.

History & Context

Kilogram has been the main unit of mass in the metric system, defined by a metal cylinder kept in France to provide a stable reference for scientists and trade. That cylinder, made of a platinum and iridium alloy, served as the international standard for many years, guiding how mass was measured around the world. In recent times, the kilogram was redefined using universal natural constants, moving away from a physical object. Stone is a traditional British unit used for body weight and for goods in markets, especially in homes and shops. It varied by region and persisted in everyday life long after the metric system began, before many places moved toward modern metric use.

Practical Use

In the United Kingdom, someone whose weight is first recorded in kilograms at a doctor’s clinic might convert that number to stone to understand it in the unit commonly used by family and fitness coaches. A separate situation is when an athlete or gym member trains with weights or tracks progress in stones and needs to convert stone to kilograms to compare with metric training targets. These conversions help people communicate with doctors, coaches, and family who use different measurement systems. The ability to switch between kilograms, stones, and pounds makes it easier to interpret health, nutrition, and training plans.

Common Mistakes When Converting Between Kilograms And Stones

Treating kilograms and stones as the same unit.
Confusing pounds with stones.
Using an incorrect conversion factor without verification.
Rounding results too early in the calculation.

Mental Shortcuts For Quick Conversions

Kg to stone: remember 1 stone ≈ 6.35 kg; estimate by dividing kg by 6.35. Stone to kg: multiply stone amount by 6.35 to estimate. This is for estimation only; use a precise converter when needed.

Kilograms And Stones Conversion Graph

Conversion Table For Kilogram And Stone

Common conversion values
Kilograms	Stones
1	0.157473
2	0.314946
5	0.787365
10	1.57473
20	3.14946
50	7.87365
100	15.7473
250	39.3683
500	78.7365
1000	157.473

Values are rounded for display; internal calculations use the exact conversion factors between kilogram and stone (0.15747304441777 and 6.35029318).

Dataset & API Access

Programmatic Access

Free JSON API with stable endpoints and predictable keys for automated bidirectional conversions.

Endpoint: https://convertreference.org/api/v1/convert/kilogram-to-stone.json

Content Type: application/json

Documentation: View API docs

Licensing

License: CC0 1.0 Universal (Public Domain)

See all datasets

Data & Editorial Process

All numerical values and formulas are generated from the Pint scientific unit library (v0.25), using constants consistent with the BIPM SI Brochure (9th Edition) and NIST Special Publication 811. Explanatory text is drafted with AI assistance and reviewed by ConvertReference editors for clarity and accuracy. This converter is completely free to use, and all calculations are performed locally in your browser and never sent to a server.

2025-12-07 – Generated: Page created using Pint v0.25 verified constants.
2025-12-07 – Reviewed: Verified by ConvertReference editors; no numerical changes required.

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