Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin.
How to Use
- Enter a value and choose the unit you're converting from.
- Choose the unit you want to convert to.
- The result updates instantly as you type — there's no Convert button to press.
- Use the swap button to reverse the conversion direction.
Formula
- Celsius to Fahrenheit
- °F = °C × 9⁄5 + 32
- Fahrenheit to Celsius
- °C = (°F − 32) × 5⁄9
- Celsius to Kelvin
- K = °C + 273.15
- Kelvin to Celsius
- °C = K − 273.15
Worked Example
Convert the freezing point of water, 0°C, to Fahrenheit.
- Apply the formula: °F = °C × 9⁄5 + 32
- 0 × 9⁄5 + 32 = 0 + 32 = 32
Result: 32°F
Conversion Table
| Unit | Symbol |
|---|---|
| Celsius | °C |
| Fahrenheit | °F |
| Kelvin | K |
About This Tool
What this tool does
Converts a temperature value between Celsius, Fahrenheit and Kelvin.
When to use it
Use it for weather, cooking, science or engineering readings given in an unfamiliar scale — converting a recipe's oven temperature, checking a weather forecast from another country, or working with Kelvin in a scientific context.
What the result means
The result is the equivalent temperature in the target unit. Unlike a simple unit conversion, temperature scales use an offset as well as a ratio, so the result is never just the input multiplied by a fixed factor.
Assumptions & limitations
Kelvin has no negative values in nature — 0 K (−273.15°C, −459.67°F) is absolute zero, the coldest physically possible temperature. This calculator rejects any input that would convert to below absolute zero as invalid, rather than silently showing a physically meaningless negative-Kelvin result.