100 Fahrenheit to Celsius (100 °F to °C)
100 Fahrenheit equals 37.7778 Celsius. Below is the formula, the worked arithmetic, and what 100 °F typically represents in everyday use.
Formula and worked answer
Formula
°C = (°F − 32) × 5/9
Substituting 100 for °F: 100 × 0.555556 + -17.777778 = 37.7778 °C. The factor 0.555556 comes from the exact international definition of the degree Fahrenheit relative to the degree Celsius, so this answer is precise rather than rounded.
What does 100 Fahrenheit represent?
100 degrees Fahrenheit (37.78 °C) is the threshold US pediatric guidelines use as the lower bound for "fever" in adults and older children, and the round figure American weather reports flag as a hot-summer-day milestone. Converted to metric the result is 37.78 °C, which sits above the 37.5 °C non-US clinical fever threshold and well below the 38 °C "true fever" cutoff most international guidelines use. The 100 °F figure also appears on many US oven dials as a "warm" or "proofing" setting, and on US household thermostats as the upper bound of what the air-conditioning unit will display before the screen reads "HI."
Values near 100 °F
- 95 °F=35 °C
- 96 °F=35.5556 °C
- 97 °F=36.1112 °C
- 98 °F=36.6667 °C
- 99 °F=37.2223 °C
- 101 °F=38.3334 °C
- 102 °F=38.8889 °C
- 103 °F=39.4445 °C
- 104 °F=40 °C
- 105 °F=40.5556 °C
°F to °C reference table around 100
| °F | °C |
|---|---|
| 50 °F | 10 °C |
| 75 °F | 23.8889 °C |
| 95 °F | 35 °C |
| 99 °F | 37.2223 °C |
| 100 °F | 37.7778 °C |
| 101 °F | 38.3334 °C |
| 105 °F | 40.5556 °C |
| 125 °F | 51.6667 °C |
| 150 °F | 65.5556 °C |
| 200 °F | 93.3334 °C |
Convert a different value
Looking for a different number of Fahrenheit? Use the full °F to °C converter to enter any value, see the worked formula, and read the full background on the degree Fahrenheit and the degree Celsius. To go the other direction, the °C to °F converter applies the inverse factor and is the page to bookmark if you usually start in Celsius.