# Temperature Converter

> Free temperature converter: convert between Celsius, Fahrenheit and Kelvin instantly, with the formulas shown.

Convert between Celsius, Fahrenheit and Kelvin instantly. The formulas are shown below so you can check the math yourself.

*Interactive tool: enter your values at https://toollantern.win/temperature-converter/ and results update instantly in your browser.*

## The formulas

- **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

Temperature is the one converter that is not a simple multiplication: the scales have different zero points, so each conversion is a multiply plus an offset. The tool converts through Celsius internally.

## Worked example

Convert **72 °F** to Celsius: (72 − 32) × 5/9 = 40 × 5/9 = **22.2 °C**. To Kelvin: 22.2 + 273.15 = **295.35 K**.

## Absolute zero

0 K (−273.15 °C, −459.67 °F) is the coldest temperature physically possible. Kelvin has no negative values and no degree symbol: it is **300 K**, not 300° K.

## Frequently asked questions
### How do you convert Fahrenheit to Celsius?

(°F − 32) × 5/9. So 98.6 °F is 37 °C, and 32 °F is 0 °C.

### How do you convert Celsius to Kelvin?

Add 273.15. Water freezes at 273.15 K and boils at 373.15 K.

### At what temperature are Celsius and Fahrenheit equal?

−40. It is the one temperature where both scales agree, which makes a handy sanity check.

### What is absolute zero?

−273.15 °C or 0 K, the coldest temperature possible. The converter accepts values below it mathematically, but they have no physical meaning.

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Interactive version: https://toollantern.win/temperature-converter/