Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Unit
Temperature Converter
Generated on April 24, 2026
?What is the Temperature Converter?
Temperature conversion moves values between Celsius (the international standard for daily life, weather, and science), Fahrenheit (used mainly in the United States), and Kelvin (the scientific absolute scale). Unlike most unit conversions, temperature scales have different zero points and different step sizes — which is why simple multiplication isn't enough. This tool is useful for cooking (oven temperatures vary by recipe origin), medicine (US fever thresholds differ from metric ones), scientific study, travel, and reading international product manuals.
The Formula
Celsius and Fahrenheit differ in two independent ways: their zero points (0 °C = 32 °F) and their step sizes (180 Fahrenheit degrees span what 100 Celsius degrees span between water's freezing and boiling points, which is where the 9/5 ratio comes from). Kelvin shares Celsius's step size exactly but resets zero to absolute zero — the theoretical coldest temperature where all molecular motion stops. Because of these offsets, temperatures are converted by rescaling and shifting, not by simple factor multiplication like mass or length.
Practical Examples
Room temperature 25 °C equals 77 °F — useful when setting a US-branded air conditioner or thermostat.
An oven at 350 °F equals roughly 177 °C — the most-searched cooking conversion in the world.
Water freezes at 0 °C which equals 273.15 K — scientists prefer Kelvin because it avoids negative numbers in physics equations.
At exactly −40°, Celsius and Fahrenheit read the same number — a handy mnemonic for cold-climate travelers.
A fever of 100.4 °F is 38 °C — the medical threshold commonly used for a low-grade fever.
Comfortable living room temperature is 21 °C, which is 70 °F — an important conversion when adjusting US- or UK-style thermostats.