100 Fahrenheit to Celsius
100°F equals 37.78°C. Get the exact answer instantly, then convert any other Fahrenheit or Celsius value with our free, accurate temperature calculator.
Convert Fahrenheit to Celsius
The calculator below is pre-filled with 100°F. Change the value to convert any Fahrenheit temperature to Celsius instantly.
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Fahrenheit to Celsius and Kelvin
Fahrenheit to Celsius Conversion Chart
Common Fahrenheit values and their exact Celsius equivalents, from freezing point to boiling point of water.
| Description | Fahrenheit | Celsius |
|---|---|---|
| Freezing point of water | 32°F | 0°C |
| Cool room temperature | 68°F | 20°C |
| Average human body temperature | 98.6°F | 37°C |
| Featured value | 100°F | 37.78°C |
| Common fever threshold | 100.4°F | 38°C |
| Hot summer day | 104°F | 40°C |
| Boiling point of water | 212°F | 100°C |
Fahrenheit to Celsius FAQ
Everything you need to know about converting 100°F, and any other Fahrenheit value, to Celsius.
100 degrees Fahrenheit is equal to 37.78 degrees Celsius. This is calculated by subtracting 32 from 100 and multiplying the result by 5/9, giving 37.777…°C, usually rounded to 37.8°C.
The formula to convert Fahrenheit to Celsius is C = (F – 32) x 5/9. Subtract 32 from the Fahrenheit temperature, then multiply the result by 5, and divide by 9 to get the Celsius value.
Yes, 100°F (about 37.8°C) is considered very hot weather in most climates, similar to a warm summer heatwave. It is also close to normal human body temperature, which is around 98.6°F (37°C), so 100°F air temperature can feel intensely hot.
A body temperature of 100°F (37.8°C) is generally considered a mild fever in adults, since normal body temperature averages around 98.6°F (37°C). Readings above 100.4°F (38°C) are typically classified as a fever by most health guidelines.