FreeDev Tools

Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Choose the source scale

    Pick Celsius, Fahrenheit, Kelvin, or Rankine in the From unit dropdown.

  2. 2

    Enter temperatures

    Type one value per line — e.g. 100, 37, -40 — or click Load Example.

  3. 3

    Read the conversions

    Each value is shown in all four scales instantly. Copy or download the result.

Frequently Asked Questions

Multiply by 9/5 and add 32: °F = °C × 1.8 + 32. This tool does it instantly — type a Celsius value, pick Celsius as the source unit, and read the Fahrenheit line in the output alongside Kelvin and Rankine.