How to Convert Temperature
Enter the temperature value in the input field.
Select the unit you are converting from.
Select the unit you want to convert to.
The result appears instantly below the unit selectors.
Key Features
Six Temperature Scales
Supports Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, and Triple Point of Water — covering everyday, scientific, and historical units.
Precise Formulas
Every conversion uses a direct formula for maximum accuracy — no rounding through intermediate units.
Scientific Notation for Extremes
Very large or very small results are shown in scientific notation so nothing is lost or misread.
100% Private
All calculations run locally in your browser. No data is sent to any server.
Your Data Stays Private
Temperature conversion runs entirely client-side using JavaScript. Nothing you enter is transmitted anywhere.
Frequently Asked Questions
What is absolute zero in Celsius and Fahrenheit?
Absolute zero is 0 K, which equals −273.15 °C and −459.67 °F. It is the lowest theoretically possible temperature.
What is the Triple Point of Water unit?
The Triple Point of Water (Tp) is a temperature scale where 1 Tp equals exactly 273.16 K — the temperature at which water coexists as solid, liquid, and gas in thermodynamic equilibrium. It is used as a defining fixed point in the International Temperature Scale.
How does Rankine relate to Fahrenheit?
Rankine is an absolute temperature scale that uses Fahrenheit-sized degrees. 0 °R equals absolute zero, and the freezing point of water is 491.67 °R. To convert Fahrenheit to Rankine, add 459.67.
What is the Réaumur scale?
The Réaumur scale (°Ré) sets 0° at water's freezing point and 80° at its boiling point. It was widely used in Europe before Celsius became standard. To convert Celsius to Réaumur, multiply by 4/5.
How many decimal places does the converter show?
Results are shown with up to 10 significant figures to avoid accumulated rounding errors. Very large or very small values are shown in scientific notation.