Temperature Converter

Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply the Celsius figure by 9/5 and then add 32. So 20 C is (20 x 1.8) + 32 = 68 F. To go from Fahrenheit to Celsius, subtract 32 first and then multiply by 5/9. Kelvin uses the same size degree as Celsius but starts at absolute zero, so K = C + 273.15.

What is absolute zero in Celsius and Fahrenheit?

Absolute zero, the coldest temperature theoretically possible, is 0 Kelvin, which equals -273.15 Celsius or -459.67 Fahrenheit. At this temperature all thermal motion stops. It is the starting point of the Kelvin scale and is used in physics and engineering calculations.

What temperature does water boil and freeze in each scale?

Water freezes at 0 C, 32 F, and 273.15 K. It boils at 100 C, 212 F, and 373.15 K at standard atmospheric pressure (sea level). These reference points are useful for sanity-checking a conversion: if you get a boiling point below 100 C you have likely swapped the direction.

Why does weather in the US feel hotter than the same number in Celsius countries?

The Fahrenheit scale uses smaller degree increments and a different zero point, so numbers are larger for the same heat. A hot summer day of 35 C in Europe is 95 F in the United States. Body temperature of 37 C equals 98.6 F. When reading a foreign weather forecast, dividing the Fahrenheit figure by 2 and subtracting 15 gives a rough Celsius estimate.