Something wrong with this tool?

About Temperature Converter Online

This tool converts between Celsius, Fahrenheit, Kelvin, and Rankine. Enter a value in any scale and the others update immediately.

The most common conversion need is Celsius ↔ Fahrenheit for comparing weather, cooking temperatures, and medical values across countries using different conventions. Kelvin is the SI base unit for thermodynamic temperature, used in science and engineering. Rankine is the absolute scale corresponding to Fahrenheit, used in some American engineering contexts.

All conversions use the precise algebraic formulas: °F = (°C × 9/5) + 32, K = °C + 273.15, and °R = (°F + 459.67).

How to use this tool

How to convert temperatures

  1. Enter the temperature

    Put the value into the Value field. Negative numbers are fine (use a minus sign) and decimals use a dot (e.g. -40.5).

  2. Pick the source scale

    From offers C (Celsius), F (Fahrenheit), and K (Kelvin). Pick the scale your number is in.

  3. Pick the target scale

    To lists the same three scales. C ↔ F is the most common conversion; physics work usually wants K.

  4. Press Run

    Result is rounded to 6 decimal places. Quick check: Celsius and Fahrenheit cross at exactly -40°; 0°C = 32°F = 273.15 K.

Similar tools