Temperature Converter

What is it?

A temperature converter translates a temperature value from one measurement scale to another. Four scales are in common use around the world: Celsius (°C), Fahrenheit (°F), Kelvin (K) and Rankine (°R). **Celsius** is the scale used by the metric system and adopted by the vast majority of countries worldwide. Water freezes at 0 °C and boils at 100 °C under standard atmospheric pressure. **Fahrenheit** is used in everyday weather forecasting and cooking in the United States, the Bahamas, the Cayman Islands and a few other territories. Water freezes at 32 °F and boils at 212 °F. **Kelvin** is the SI (International System of Units) base unit of temperature, used in physics, chemistry and engineering. Zero Kelvin (0 K) is absolute zero — the coldest theoretically possible temperature, at which molecular motion would stop completely. There are no negative Kelvin values. **Rankine** is an absolute temperature scale like Kelvin, but uses the Fahrenheit degree size. It is used in some engineering disciplines in the United States. Absolute zero is 0 °R. This free converter accepts any value in any of the four scales and updates all others simultaneously with the correct formulas.

How to use it

1. Click or tap any of the four input fields (Celsius, Fahrenheit, Kelvin, Rankine).
2. Type your temperature value — the other three fields update instantly.
3. Click the copy icon next to any field to copy that value.
4. Scroll down to the reference table to see common temperature benchmarks across all four scales.
5. Use the reset button to clear all fields and start a new conversion.

Why use this tool

Temperature conversion is one of the most common everyday maths tasks — checking a fever in the scale your thermometer uses, following a recipe from an American cookbook with your European oven, understanding a weather forecast from a country that uses a different scale, or working with scientific data in Kelvin. Most online converters handle only Celsius and Fahrenheit, leaving Kelvin and Rankine users to do multiple conversions or use separate tools. Our converter handles all four simultaneously: change one value and see all three others update in the same instant. The reference table — body temperature, water boiling and freezing, absolute zero, room temperature, oven temperatures — gives you sanity checks without needing to memorise formulas. All conversions happen in your browser with no round trips to a server. There is no sign up, no tracking, and no limit on how many conversions you can do.

Frequently asked questions