---
title: "Temperature Converter — Celsius, Fahrenheit, Kelvin & Why Countries Differ"
description: "Convert between Celsius, Fahrenheit, Kelvin, and Réaumur with instant results. Learn why the US uses Fahrenheit while the rest of the world uses Celsius."
url: "https://worldcalculators.org/calculators/temperature/"
canonical: "https://worldcalculators.org/calculators/temperature/"
---

# Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, and Réaumur with instant results. Learn why the US uses Fahrenheit while the rest of the world uses Celsius.

## Quick answer

°C to °F: multiply by 9/5 then add 32. °F to °C: subtract 32 then multiply by 5/9. Key references: 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temp). Only the US, Liberia, and Myanmar still officially use Fahrenheit.

## Why Does the US Use Fahrenheit While the Rest of the World Uses Celsius?

The short answer: history and inertia. Fahrenheit was developed in 1724 by Daniel Fahrenheit, a German physicist. It was the dominant temperature scale in the English-speaking world for centuries.
In 1790, the French Academy of Sciences developed the metric system including Celsius (then called "centigrade"). Over the 19th and 20th centuries, most nations switched to Celsius as part of broader metrication.

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