---
title: "Weight Converter — kg, lbs, Stone, Ounces, Tonnes, Troy Oz & More"
description: "Convert between all weight units: kilograms, pounds, stone (UK), ounces, grams, metric tonnes, US short tons, UK long tons, carats, and troy ounces. Explains why the UK uses stone for body weight."
url: "https://worldcalculators.org/calculators/weight-converter/"
canonical: "https://worldcalculators.org/calculators/weight-converter/"
---

# Weight Converter

Convert between all weight units: kilograms, pounds, stone (UK), ounces, grams, metric tonnes, US short tons, UK long tons, carats, and troy ounces. Explains why the UK uses stone for body weight.

## Quick answer

The stone (14 lbs) is a medieval English measurement. While the UK officially uses kilograms, the stone persists culturally for body weight — particularly on bathroom scales and in NHS documentation. According to UK surveys, over 70% of British adults still primarily think of their weight in stone and pounds rather than kilograms. Ireland also uses stone informally. All other countries use kilograms or pounds.

## Why Does the UK Use Stone for Body Weight?

The stone (14 lbs) is a medieval English measurement. While the UK officially uses kilograms, the stone persists culturally for body weight — particularly on bathroom scales and in NHS documentation. According to UK surveys, over 70% of British adults still primarily think of their weight in stone and pounds rather than kilograms. Ireland also uses stone informally. All other countries use kilograms or pounds.

## Frequently Asked Questions

US short ton: 2,000 lb = 907.185 kg. Metric tonne (used in the UK, EU, Australia): 1,000 kg = 2,204.62 lb. UK long ton (historical): 2,240 lb = 1,016.05 kg. The difference between a US ton and a metric tonne is about 10%. For bulk commodity trading (grain, coal, steel), this difference matters significantly when comparing international prices.
A troy ounce (ozt) = 31.1035 grams = 1.0971 avoirdupois ounces. The regular ounce (used in the US for food and body weight) = 28.3495 grams. Troy ounces are used worldwide for pricing precious metals — gold, silver, platinum, and palladium are all quoted in troy ounces on all commodity exchanges globally, regardless of country. 1 troy pound = 12 troy ounces (not 16).

Source: https://worldcalculators.org/calculators/weight-converter/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.