Temperature Converter: Celsius, Fahrenheit, Kelvin & Rankine
Temperature conversion is essential in science, cooking, travel, and daily life. Whether you are reading a weather forecast in Celsius while accustomed to Fahrenheit, adjusting oven temperatures for an international recipe, or performing scientific calculations in Kelvin, a reliable temperature converter saves time and prevents errors.
Our free online temperature converter supports four major temperature scales: Celsius, Fahrenheit, Kelvin, and Rankine. Simply enter a temperature value, choose your input scale, and instantly see the equivalent in all other scales. The visual thermometer provides an intuitive gauge of the temperature, while the formula display shows you exactly how each conversion is calculated.
Celsius is the most widely used temperature scale globally, defined by the freezing point (0 °C) and boiling point (100 °C) of water at standard atmospheric pressure. Fahrenheit remains common in the United States for weather, cooking, and everyday use. Kelvin is the SI base unit of temperature used in scientific and engineering contexts, starting from absolute zero. Rankine, used primarily in some American engineering fields, applies the Fahrenheit interval starting from absolute zero.
The tool also includes a table of common reference points such as water boiling and freezing temperatures, normal human body temperature, typical room temperature, and absolute zero. These benchmarks help you quickly verify conversions and build intuition for each scale. Conversion history is saved locally so you can revisit past calculations without re-entering values.