Temperature Converter

Enter a temperature value and select a unit to convert to all other units instantly.

Temperature Value

From Unit

How to use

Enter a value

Type any temperature value in the input field. Results update automatically as you type.
Select your unit

Choose the unit you are converting from — Celsius, Fahrenheit, Kelvin, or Rankine.
Read all conversions

All four unit conversions are shown instantly in the results panel.

Quick Reference

Water freezes 0°C / 32°F
Body temperature 37°C / 98.6°F
Water boils 100°C / 212°F
Absolute zero -273.15°C / 0K

Temperature Scales Explained

There are four main temperature scales used around the world. Celsius is used in most countries for everyday measurements. Fahrenheit is primarily used in the United States. Kelvin is the standard unit in science and physics. Rankine is used in some engineering fields, particularly in the United States.

Conversion Formulas

From	To Fahrenheit	To Kelvin	To Rankine
Celsius	(°C × 9/5) + 32	°C + 273.15	(°C + 273.15) × 9/5
Fahrenheit	—	(°F + 459.67) × 5/9	°F + 459.67
Kelvin	(K × 9/5) − 459.67	—	K × 9/5

Frequently Asked Questions

What is absolute zero?

Absolute zero is the lowest possible temperature — 0 Kelvin, or -273.15°C, or -459.67°F. At this temperature, atoms have minimal thermal motion.

Why does the US use Fahrenheit?

The US adopted the Fahrenheit scale in the early 1700s before the Celsius scale was widely established. It remains in use today due to historical convention.

What is normal room temperature in Celsius?

Normal room temperature is generally considered to be around 20–22°C (68–72°F).