Temperature Converter

Convert temperatures instantly in your browser

Enter a temperature value and choose your source and target units — the result updates as you type. All three major scales are supported: Celsius (used in most of the world), Fahrenheit (used in the United States), and Kelvin (used in science and engineering). Nothing is sent to a server; every calculation runs locally in your browser.

The converter uses exact formulas defined by the International Temperature Scale. Celsius and Kelvin differ only by the zero point (0 K = -273.15 °C), while Fahrenheit uses a different step size and zero point. The swap button lets you quickly reverse the direction of a conversion without retyping your value.

FAQ

What is absolute zero? Absolute zero is 0 K, which equals -273.15 °C or -459.67 °F. It is the theoretical lowest possible temperature.

Why does -40 appear on both scales? The Celsius and Fahrenheit scales intersect at -40 degrees — at that point the two scales read the same value.

How accurate are the results? The converter uses the exact formulas (C = (F - 32) x 5/9 and K = C + 273.15) with full floating-point precision.