Celsius to Fahrenheit

Convert temperature between Celsius, Fahrenheit, and Kelvin. Type in any unit and all others update instantly.

Enter Temperature

Celsius (°C)100 °C

°C

-100°C1000°C

Fahrenheit (°F)

°F

Kelvin (K)

Your Result

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Fahrenheit

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Kelvin—

Rankine—

Common Reference—

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Did You Know?

Quick mental trick

To roughly convert C to F in your head: double the Celsius and add 30. So 20C is about 70F (actual 68F). Close enough for everyday use.

How to use this calculator

Type in any field

Enter Celsius, Fahrenheit, or Kelvin and all others update instantly.

Use the slider

Sweep the Celsius slider from -100 to 1000.

Check references

See the nearest real-world temperature landmark for context.

The formula explained

F = (C x 9/5) + 32

C = (F - 32) x 5/9

K = C + 273.15

The Kelvin scale starts at absolute zero (-273.15C), the coldest theoretically possible temperature.

Frequently Asked Questions

What is 37C in Fahrenheit?

37C = 98.6F — normal human body temperature. Formula: (37 x 9/5) + 32 = 98.6F.

What temperature is the same in C and F?

-40 degrees. Both scales meet exactly at -40, so -40C = -40F.

What is absolute zero?

0 Kelvin = -273.15C = -459.67F. The lowest possible temperature where all molecular motion stops.

Why does the US use Fahrenheit?

The US never officially adopted the metric system. Most other countries switched to Celsius during metrication in the 18th to 20th centuries.