Temperature Converter Units
Convert Celsius, Fahrenheit, Kelvin and Rankine.
Temperature Converter is a free online tool that convert Celsius, Fahrenheit, Kelvin and Rankine. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Units
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- 3
- Works offline
- Yes, after the first visit
About Temperature Converter
Temperature scales have different zero points, so they convert by formula rather than a simple multiplier. −40 is the one temperature where Celsius and Fahrenheit agree.
How to use it
- Enter value, from and to.
- Results update the moment anything changes.
The 3 settings
| Setting | What it does | Default |
|---|---|---|
| Value | A numeric value. | 20 |
| From | Choose from 4: Celsius, Fahrenheit, Kelvin, Rankine. | Celsius |
| To | Choose from 4: Celsius, Fahrenheit, Kelvin, Rankine. | Fahrenheit |
Units covered
These scales convert by formula rather than a single multiplier, because their zero points differ. 4 units are supported.
| Unit | Symbol |
|---|---|
| Celsius | °C |
| Fahrenheit | °F |
| Kelvin | K |
| Rankine | °R |
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
| Controls | Value, From, To |
Questions
At what temperature do Celsius and Fahrenheit agree?
Minus 40. It is the only point where the two scales cross, which is why −40° needs no unit.
Why does Kelvin have no degree symbol?
Because it is an absolute scale, not a relative one. The SI convention has been "295 K", not "295 °K", since 1967.
What does the from option change?
It offers 4 choices — Celsius, Fahrenheit, Kelvin and Rankine. The default is Celsius, which suits most cases; change it when your input or your destination calls for something specific.