Celsius to Fahrenheit Converter

Multiply the Celsius value by 9/5 (which is 1.8), then add 32. So F = C times 9/5 plus 32. For example, 20 C becomes 20 times 1.8 plus 32, which is 68 F.

0 C is 32 F (water freezes), 20 C is 68 F (room temperature), 37 C is 98.6 F (body heat), and 100 C is 212 F (water boils at sea level). The built-in table also shows 1, 2, 5, 10, 25 and 50 degrees.

Normal body temperature is about 37 C, which is exactly 98.6 F. A reading of 38 C equals 100.4 F and is generally treated as a low-grade fever.

They meet at minus 40 degrees: -40 C is exactly -40 F. It is the single crossover point where both scales report the same number.

Yes. Type a minus sign in front of any value, so a freezer reading of -18 C converts to -0.4 F and a winter low of -25 C becomes -13 F. The formula works the same across the whole range.

The formula itself is exact, so 100 C is truly 212 F. Displayed answers are rounded to at most six decimal places for readability, which never affects everyday temperatures.

Yes. The two boxes are linked, so typing in the Fahrenheit box converts the other way using C = (F minus 32) times 5/9. There is also a dedicated Fahrenheit to Celsius tool if you prefer that as the starting point.

This page focuses on the Celsius and Fahrenheit pair. To work with Kelvin, use one of the Kelvin converter tools, since absolute zero at 0 K equals -273.15 C.

No. The conversion runs entirely in your browser with no network request, so the temperatures you enter never leave your device and the tool keeps working offline.