Online Tool Store
Temperature Converter
Convert a temperature between Celsius, Fahrenheit, and Kelvin instantly, with all three scales shown at once and a check against absolute zero. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example shown - replace with your own value.
Celsius
Fahrenheit
Kelvin
How the temperature converter works
- Enter a temperature value and choose the unit it's currently in.
- The tool converts that value to Celsius internally as a common reference point.
- Celsius, Fahrenheit, and Kelvin equivalents are then displayed side by side.
The formulas
°F = °C × 9/5 + 32 | K = °C + 273.15 | °C = (°F - 32) × 5/9
Example: 100°C (boiling point of water at sea level) equals 212°F and 373.15 K. 0°C (freezing point) equals 32°F and 273.15 K.
FAQ
What is the formula to convert Celsius to Fahrenheit?
°F = °C × 9/5 + 32. For example, 100°C converts to 212°F.
How do I convert Kelvin to Celsius?
Subtract 273.15 from the Kelvin value: °C = K - 273.15. Kelvin has no negative values below absolute zero.
Why does the tool reject some values?
Absolute zero (-273.15°C, -459.67°F, 0 K) is the lowest physically possible temperature, so any input that converts below it is rejected.
Does the result update automatically?
Yes. All three units recalculate instantly as you type a value or switch the "from" unit - there is no separate convert button.
How we compare
| Feature | Online Tool Store | Google search converter | UnitConverters.net |
|---|---|---|---|
| Shows all three scales at once | ✓ | ✗ | ✗ |
| No ads or sign-up | ✓ | ✓ | ✗ |
| Validates against absolute zero | ✓ | ✗ | ✗ |
For a quick, all-in-one view of Celsius, Fahrenheit, and Kelvin at the same time, Temperature Converter saves the extra clicks.