Ounce To Stone Converter

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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 ounce = 0.00446428571428571 stone
1 stone = 224 ounce

(Exact factors: 0.00446428571428571 and 224)

Sources: NIST · BIPM

About This Ounce And Stone Converter

This friendly tool helps you work with ounces and stones. Switch between units in an instant to view the corresponding value. A swap button makes changing directions quick and effortless. Use it to compare measurements with confidence.

What Are Ounces And Stones?

What Is An Ounce?

Ounce (oz) is a unit of mass in the avoirdupois system. It equals 1/16 of a pound and exactly 28.349523125 g (0.028349523125 kg). It belongs to the imperial/US customary system. Symbol: oz. Example: a slice of bread typically weighs about 1 oz (28 g).

What Is A Stone?

Stone (st) is a unit of mass used in the British Imperial and US customary systems. It equals 14 pounds avoirdupois, exactly 6.35029318 kilograms. Symbol: st. Example: A typical adult weighs about 11 stone (≈70 kg).

When To Use Ounce Vs Stone

Ounce Usage

An ounce is a customary weight unit used mainly in the United States, with limited use in the United Kingdom, Canada, and Liberia for everyday weights and portions.

Stone Usage

Stone is used in the United Kingdom and Ireland to express a person's body weight, typically stated in stones and pounds.

How To Convert Between Ounces And Stones

Conversion Formulas

Ounce to Stone:
ounce × 0.00446428571428571 = stone

Stone to Ounce:
stone × 224 = ounce

Step-by-Step Guide

Ounce to Stone

Take your value in ounces.
Multiply by 0.00446428571428571.
The result is in stones.

Stone to Ounce

Take your value in stones.
Multiply by 224.
The result is in ounces.

Example: Convert 0.0101967 ounces to stones.

Exact: 0.0101967 × 0.00446428571428571 = 0.0000455211090505282 stones.
Rounded: approximately 0.0000455211 stones.

Example: Convert 5 stones to ounces.

Exact: 5 × 224 = 1120 ounces.

History & Context

The ounce traces back to ancient Rome, where the word uncia signified a small share of a pound and later spread through Europe as merchants weighed small items. In medieval England the term grew in markets, shops, and apothecaries, and distinct forms of the ounce developed for different needs: the avoirdupois ounce for everyday goods and the troy ounce for precious metals. The stone has long been a British weight used for people and goods; it was practical in daily life, tied to markets and farms, and its size varied over time and place, yet it remained a familiar measure in Britain into modern times.

Practical Use

A person tracking fitness progress asks to convert ounces to stone because their doctor or trainer uses stones to describe body weight. They may have a reading on a home scale shown in ounces and need to translate it into stones to communicate with a UK-based coach. In another scenario, a seller or hobbyist weighing an item in stones wants the weight in ounces to fit a standard shipping label or scale reading. Knowing both conversions helps express large weights in familiar units, making it easier to compare, calculate, and label items.

Common Mistakes When Converting Between Ounces And Stones

Confusing avoirdupois ounces with troy ounces when converting to stone.
Treating ounces and stones as directly interchangeable without using pounds as an intermediate unit.
Rounding results when converting to or from stone is a common mistake.
Using the wrong direction of conversion by assuming stones come directly from ounces.

Mental Shortcuts For Quick Conversions

Tip 1: Ounce to stone — remember 1 stone = 224 oz (14 lb × 16 oz). Tip 2: Stone to ounces — multiply by 224. Note: this is for estimation only; use a precise converter for accuracy.

Ounces And Stones Conversion Graph

Conversion Table For Ounce And Stone

Common conversion values
Ounces	Stones
0.00203935	0.00000910422
0.0101967	0.0000455211
0.0203935	0.0000910422
0.0407869	0.000182084
0.101967	0.000455211
0.203935	0.000910422
0.407869	0.00182084
1.01967	0.00455211
2.03935	0.00910422
4.07869	0.0182084
10.1967	0.0455211

Values are rounded for display; internal calculations use the exact conversion factors between ounce and stone (0.00446428571428571 and 224).

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/ounce-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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