Weight Converter: Stones, Pounds and Kilograms

Author: Ian C. Langtree - Writer/Editor for Disabled World (DW)
Published: 2014/01/04 - Updated: 2026/06/09
Publication Type: Conversion, Calculation

Contents: Synopsis - Definition - Introduction - Main - Insights, Updates - Related Publications

Synopsis: This page provides a user-friendly weight calculator and printable chart for converting measurements from stones to pounds, kilograms, and ounces. It is particularly useful for individuals in regions where the stone is still a common unit of measure, like the United Kingdom (UK) and Ireland, and sometimes in parts of the Commonwealth, like Australia and New Zealand, helping to quickly and accurately convert weights for health, fitness, or daily life purposes. The tool enhances understanding by offering conversions in both directions, thus bridging the gap between imperial and metric systems, which can be especially helpful in medical contexts, international communication, or when dealing with diverse measurement standards.

At a Glance

• 1 - One stone equals exactly 14 pounds or about 6.35 kilograms, and in everyday British or Irish use a person might say they weigh "11 stone 4," meaning 11 stone and 4 pounds, rather than giving a single pound or kilogram figure.
• 2 - The everyday avoirdupois ounce weighs 28.35 grams, but it is not the same as the troy ounce used for precious metals, which is heavier at 31.10 grams.
• 3 - Australia, New Zealand, and increasingly Canada largely switched to kilograms back in the 1960s and 70s, while the United States keeps the Imperial system and treats metric use as preferred but voluntary.

Topic Definition: Weight Converter

A weight converter is a simple tool, usually a calculator paired with a reference chart, that translates a body weight or object weight from one unit of measure into another, most commonly between stones, pounds, and kilograms. It exists because different parts of the world count weight in different ways. People in Britain and Ireland still talk in stones, the United States sticks with pounds, and most other countries have moved to kilograms, so the same person can be described by three very different sounding numbers. By letting you enter a figure in whatever unit you already know and instantly showing the equivalents, a converter bridges the gap between the imperial and metric systems, which is handy for everything from tracking your health and reading a doctor's notes to traveling or comparing measurements with someone overseas. At its heart it relies on fixed relationships, such as 14 pounds to a stone and roughly 6.35 kilograms to a stone, to keep the results consistent and accurate.

Introduction

What is a Stone in Weight Measurement?

The stone (st) is a unit of measure equal to 14 pounds (lb) or 6.3503 kilograms (kg). The plural of stone is also stone. The stone measurement remains widely used in Britain, Australia, and Ireland for measuring human body weight. In the U.K., Australia, New Zealand, and Ireland, people may be said to weigh, e.g., "11 stone 4" (11 stones and 4 pounds), rather than "72 kilograms", or "158 pounds", as in the United States (US). Many scales today provide a "change weight display" setting that you can select to display either kilograms, pounds, or stone/pounds.

Quick Stone Conversions:

• 1 stone = 14 pounds
• 1 stone = 6.35029318 kilograms
• To convert kilograms to stones, divide by 6.35029318
• To convert stones to kilograms, multiply by 6.35029318

Main Content

Chart to Convert Stones to Kilograms and Pounds

Below the chart is an easy-to-read weight conversion calculator for Stone, Pounds, and Kilograms, and a stone conversion graph.

Calculator to Convert Stones to Pounds and/or Kilograms

Enter the value you know in the appropriate box, and the other figures will be instantly calculated for you.

Stones to Pounds Conversion Graph

Avoirdupois

An avoirdupois ounce is a unit of weight equal to 28.35 grams and is defined as 1/16 of an avoirdupois pound (there are 16 ounces in a pound). It is the standard ounce used for everyday weighing and is distinct from the troy ounce, which is used for precious metals and weighs more (31.10) grams.

• 1 avoirdupois ounce = 28.35 grams
• 1 avoirdupois ounce = 437.5 grains
• 16 avoirdupois ounces = 1 avoirdupois pound

Countries That Use Imperial and Metric Systems

In Australia, New Zealand, and increasingly so in Canada, the metric system (kilograms) has replaced the measurement of stone and pounds since the 1960's-70's.

The stone unit of measurement is still used in Great Britain, Ireland, and by some people in Australia for measuring human body weight, as it will probably take a generation or more for populations to fully convert to the metric system (i.e., kilograms instead of stones or pounds). People in those countries who still use the stone unit of measurement are said to weigh, for example, 11 stone 4 (11 stone and 4 pounds), which is approximately 72 kilograms or 158 pounds.

The United States still uses the older Imperial system, e.g., pounds as body weight measurement; however, U.S. law has indicated the metric system to be preferred, but not the only one allowed. Compliance is totally voluntary - some people and industries convert fully, some not at all, and most are a mix - resulting in ongoing confusion both domestically and internationally from not using the metric system consistently.

Insights, Analysis, and Developments

Author Credentials: Ian is the founder and Editor-in-Chief of Disabled World, a leading resource for news and information on disability issues. With a global perspective shaped by years of travel and lived experience, Ian is a committed proponent of the Social Model of Disability-a transformative framework developed by disabled activists in the 1970s that emphasizes dismantling societal barriers rather than focusing solely on individual impairments. His work reflects a deep commitment to disability rights, accessibility, and social inclusion. To learn more about Ian's background, expertise, and accomplishments, visit his full biography.