Online calculator for exact conversion between Celsius, Fahrenheit, and Kelvin. Fast and easy to use tool.
From a physics standpoint, temperature is a measure of the average kinetic energy of a substance's molecules — the faster they move, the "hotter" something feels to us. But how we measure that has varied enormously throughout history, and it's the only common physical quantity that uses three completely different scales in everyday use: Celsius, Fahrenheit, and Kelvin. Celsius and Fahrenheit are relative scales, anchored to real physical points (the freezing and boiling of water, in Celsius's case), but with an arbitrary zero. Kelvin is different: its zero corresponds to absolute zero, the theoretical point where all molecular vibration stops — which is why the Kelvin scale never has negative values, and it's the official scale of the International System, used almost exclusively in scientific and engineering contexts. Converting between these scales isn't a simple multiplication, like with length or weight — each has a different starting point (offset), which requires specific formulas for each pair. This converter applies those exact formulas, avoiding the common mistake of treating temperature as if it were a simple linear unit. This is particularly critical in contexts like international cooking (where 180°C and 350°F represent the same oven temperature, but an error of a few degrees can ruin a recipe), medicine (fever and hypothermia are defined within narrow ranges), and materials engineering, where processes like casting and heat treatment depend on exact temperatures to work as expected.
Multiply by 1.8 and add 32.
It is the absolute temperature scale used in science, where 0K is absolute zero.
100°F is approximately equivalent to 37.78°C.
Due to historical tradition; most other countries adopt the metric system (Celsius).
Yes, our algorithms use exact formulas based on physics definitions.
Use °F = (°C × 9/5) + 32. Example: 25°C = (25 × 1.8) + 32 = 77°F.
0°C equals 32°F, the freezing point of water.
About 37°C, which is approximately 98.6°F.
No. Kelvin starts at absolute zero (−273.15°C). Conversion is K = °C + 273.15.
It is the only point where the two scales coincide, due to how they were defined.