°C to °F: (°C × 9/5) + 32
°F to °C: (°F − 32) × 5/9
°C to K: °C + 273.15
K to °C: K − 273.15
Absolute zero: −273.15°C / −459.67°F / 0 K — the coldest possible temperature.
Water freezes: 0°C / 32°F / 273.15 K
Body temperature: 37°C / 98.6°F / 310.15 K
Water boils: 100°C / 212°F / 373.15 K (at sea level)
−40° crossover: the one temperature where Celsius and Fahrenheit are equal.
Why does the UK use both Celsius and Fahrenheit?
Weather forecasts use Celsius, but many older people still think in Fahrenheit. Cooking recipes can use either. This converter lets you switch instantly.
What is Kelvin used for?
Kelvin is used in science, physics, and engineering. Unlike Celsius and Fahrenheit, it has no negative values — 0 K is absolute zero, the lowest possible temperature.