104 Fahrenheit to Celsius (104 °F to °C)
104 Fahrenheit equals 40 Celsius. Below is the formula, the worked arithmetic, and what 104 °F typically represents in everyday use.
Formula and worked answer
Formula
°C = (°F − 32) × 5/9
Substituting 104 for °F: 104 × 0.555556 + -17.777778 = 40 °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 104 Fahrenheit represent?
104 degrees Fahrenheit (40 °C) is the "high fever" threshold US emergency-medicine guidelines flag as requiring urgent evaluation, especially in young children, and the temperature at which heat-related illness becomes likely in healthy adults. Converted to metric it is exactly 40 °C, which is the figure used in international clinical guidelines for the same threshold. It is also the upper end of the operating range for many electronic devices sold in the US, where the maximum-storage-temperature label reads "104 °F / 40 °C." For patients sharing fever data across borders or clinicians comparing US and metric guidelines, the 104 °F = 40 °C equivalence is one of the most-used conversions in pediatric medicine.
Values near 104 °F
- 99 °F=37.2223 °C
- 100 °F=37.7778 °C
- 101 °F=38.3334 °C
- 102 °F=38.8889 °C
- 103 °F=39.4445 °C
- 105 °F=40.5556 °C
- 106 °F=41.1112 °C
- 107 °F=41.6667 °C
- 108 °F=42.2223 °C
- 109 °F=42.7778 °C
°F to °C reference table around 104
| °F | °C |
|---|---|
| 52 °F | 11.1111 °C |
| 78 °F | 25.5556 °C |
| 99 °F | 37.2223 °C |
| 103 °F | 39.4445 °C |
| 104 °F | 40 °C |
| 105 °F | 40.5556 °C |
| 109 °F | 42.7778 °C |
| 130 °F | 54.4445 °C |
| 156 °F | 68.889 °C |
| 208 °F | 97.7779 °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.