Temperature Converter
Enter a temperature and its unit to convert it to Celsius, Fahrenheit, and Kelvin.
Conversion formulas
°F = (°C × 9/5) + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
Kelvin has no negative values in practice — 0 K (−273.15°C) is absolute zero, the coldest temperature theoretically possible, so this converter rejects any input below that point.
Frequently asked questions
What temperature is the same in Celsius and Fahrenheit?
−40° is the one point where the two scales meet: −40°C equals −40°F.
Why does science use Kelvin instead of Celsius?
Kelvin starts at absolute zero with no negative numbers, which makes it easier to work with in physics and chemistry formulas where temperature is proportional to energy (like the ideal gas law).