Online Temperature Unit Converter
| # | Scale name | Symbol | Conversion result |
|---|
| Scenario | Celsius | Fahrenheit | Kelvin |
|---|
About the Online Temperature Unit Converter
Tool Introduction
This tool supports real-time conversion between 8 common temperature scales. Unlike units such as length and weight that have a "multiple relationship", temperature units have fixed offsets, for example 0°C = 32°F = 273.15K, so temperature conversion requires special formulas. Whether for scientific experiment records, interpreting cross-border weather forecasts, historical document research, or baking temperature comparison, enter a value to get an accurate result immediately.
Common temperature scales
Celsius (°C): the globally used standard, with water freezing at 0°C and boiling at 100°C. Fahrenheit (°F): used in the US, Bahamas, and other countries, with water freezing at 32°F and boiling at 212°F. Kelvin (K): the base unit of temperature in the International System of Units (SI), starting from absolute zero (-273.15°C), without a degree symbol. Conversion formulas for the three scales: °F = °C × 9/5 + 32; K = °C + 273.15.
Scientific and engineering temperature scales
Rankine (°R): same scale interval as Fahrenheit but starting from absolute zero, mainly used for thermodynamic calculations in US engineering, 1°R = 1°F change. 1 K = 1.8°R. Réaumur (°Ré): invented by French scientist Réaumur in 1730, with water freezing at 0°Ré and boiling at 80°Ré; once widely used in Europe, 1°Ré = 1.25°C.
Historical temperature scales
Rømer (°Rø): invented by Danish astronomer Ole Rømer in 1701, a predecessor of Fahrenheit. Water freezes at 7.5°Rø and boils at 60°Rø. Newton (°N): invented by Isaac Newton in 1701, with water freezing at 0°N and boiling at 33°N; one of the early thermometer standards. Delisle (°De): invented by French astronomer Joseph-Nicolas Delisle, with water boiling at 0°De and freezing at 150°De (the lower the temperature, the larger the value).
Privacy and Security
All conversion logic is performed locally in your browser; no values are uploaded to a server. You can use it with confidence, without worrying about data leaks.
Tips
1. After entering any value, all temperature scales are automatically converted in real time; 2. The temperature color band at the top shows the temperature's visual position in real time (blue = extremely cold, red = extremely hot); 3. Click the circular button in the middle to swap the source and target scales with one click; 4. The common conversions section provides typical scenarios for one-click switching; 5. The "Common temperature reference points" table at the bottom lists typical temperatures from absolute zero to the Sun's surface for quick comparison.