Temperature Converter
Convert any temperature between Celsius, Fahrenheit, Kelvin and Rankine — all four scales shown simultaneously as you type.
Common reference points: Water freezes at 0°C / 32°F / 273.15K | Water boils at 100°C / 212°F / 373.15K | Absolute zero = 0K / −273.15°C
What Does This Tool Do?
Convert temperatures between all four common scales — Celsius, Fahrenheit, Kelvin and Rankine. All values are shown at once and update in real time. Includes common reference points.
Key Features
4 Scales
°C, °F, K and °R simultaneously.
Live Updates
Converts as you type.
Reference Points
Freezing, boiling and absolute zero shown.
Click to Copy
Click any value to copy it.
How to Use
- Enter the temperature value.
- Select the scale you are converting from.
- All four scales update instantly.
Frequently Asked Questions
What is the formula for Celsius to Fahrenheit?▾
°F = °C × 9/5 + 32. Reverse: °C = (°F − 32) × 5/9.
What is Kelvin?▾
Kelvin is the SI base unit of temperature. 0K is absolute zero (the coldest possible temperature). K = °C + 273.15 — there are no negative Kelvin values.
What is Rankine?▾
Rankine (°R) is used in some US engineering fields. Like Kelvin it starts at absolute zero, but uses Fahrenheit-sized degrees. °R = °F + 459.67.