Formula: °F = (°C × 9/5) + 32 · °C = (°F − 32) × 5/9
Convert temperatures in seconds with this free tool. Whether you’re checking the weather, adjusting oven settings, or studying science, quickly switch between Fahrenheit (°F), Celsius (°C / Centigrade), and Kelvin (K). Type a value, choose the units, and get an instant result—with a handy chart for common conversions like 0°C = 32°F, 20°C = 68°F, and 100°C = 212°F. Exact formulas are included below for clarity and accuracy.
°C = (°F − 32) × 5/9°F = (°C × 9/5) + 32K = °C + 273.15 · °C = K − 273.15-40°C = -40°F
0°C = 32°F (freezing point of water)
20°C = 68°F (room temperature)
37°C = 98.6°F (human body)
100°C = 212°F (boiling point of water)
Is Celsius the same as Centigrade?
Yes. “Centigrade” is an older name for Celsius; they refer to the same scale.
What is Kelvin used for?
Kelvin (K) is the SI unit used in science and engineering; 0 K is absolute zero.
Quick mental tip:
To estimate °F from °C, double the value and add 30 (rough approximation).