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Converters

Temperature Converter

Convert Celsius, Fahrenheit and Kelvin with absolute-zero validation.

Conversion factors explained belowNo live data needed

Value & units

Runs on your device

CONVERTED VALUE

Your result

Let’s calculate.

Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this converter

  1. Enter temperature, from, to.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Fahrenheit = Celsius × 9/5 + 32. Kelvin = Celsius + 273.15. Reverse these relationships to convert back.

A WORKED EXAMPLE

20°C equals 68°F and 293.15 K. At −40, Celsius and Fahrenheit have the same numerical value.

What to keep in mind

This converts temperature readings, not temperature differences. Negative Kelvin inputs are rejected.

Common questions

Why can I not enter negative Kelvin?

Zero Kelvin is absolute zero. Ordinary thermodynamic temperature readings cannot be below it.

Does a 10°C increase equal an 18°F increase?

Yes. Differences use the scale factor only; do not add 32 when converting a change in temperature.

Methodology maintained by ClarityKit. How these tools are built and checked.