Temperature Conversion Calculator
Enter a value in any field to convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur.
Understanding Temperature Scales
Temperature scales are used to measure the hotness or coldness of an object. While Celsius and Fahrenheit are the most common for everyday use, other scales like Kelvin, Rankine, and Réaumur are vital in scientific and engineering fields.
The Five Scales
- Celsius (°C): The most widely used scale, with 0°C as the freezing point and 100°C as the boiling point of water.
- Fahrenheit (°F): Predominantly used in the United States, with 32°F as the freezing point and 212°F as the boiling point of water.
- Kelvin (K): The standard unit of temperature in science. It is an absolute scale, meaning 0 K is absolute zero, the theoretical point where all molecular motion ceases. There are no degrees in Kelvin.
- Rankine (°Ra): An absolute scale similar to Kelvin, but based on the Fahrenheit degree. 0°Ra is absolute zero.
- Réaumur (°Ré): An older scale, primarily used in parts of Europe in the past. Its freezing point is 0°Ré and boiling point is 80°Ré.
Conversion Formulas
The conversion between these scales is based on a set of mathematical formulas, which this calculator uses to provide instant, accurate results. For example:
- Celsius to Fahrenheit: $F = C \times \frac{9}{5} + 32$
- Celsius to Kelvin: $K = C + 273.15$
All conversions in this tool are performed client-side using JavaScript, ensuring your privacy and a fast user experience.