104 Fahrenheit to Celsius
104 °F = 40 °C
104 degrees Fahrenheit equals 40 degrees Celsius.
How to convert 104 °F to °C
Use the formula °C = (°F − 32) × 5/9:
°C = (104 − 32) × 5/9°C = 72 × 5/9°C = 40
So 104 °F = 40 °C.
Rounded values and quick estimate
- Rounded to a whole number: 40 °C
- Rounded to one decimal place: 40 °C
Quick mental estimate: subtract 30 and halve it. For 104 °F that gives about 37 °C — off by 3 °C (7.5%). Use the exact formula when precision matters.
104 Fahrenheit in other units
40 °C falls in the range used for human body temperature. As air temperature it is extreme heat. As a body reading, about 36.1–37.2 °C is typical for healthy adults, 38 °C (100.4 °F) and above is commonly considered a fever, and below 35 °C (95 °F) is considered hypothermia.
- Celsius
- 40 °C
- Degrees Réaumur
- 32 °Ré
- Degrees Delisle
- 90 °De
- Degrees Newton
- 13.2 °N
- Degrees Rømer
- 28.5 °Rø
- Kelvin
- 313.15 K
- Rankine
- 563.67 °R
General information only, not medical advice. If you are concerned about a temperature reading, contact a healthcare professional.
104 °F and nearby values
About fahrenheit and celsius
The Fahrenheit scale puts water’s freezing point at 32 °F and boiling point at 212 °F. It is the everyday temperature scale in the United States.
The Celsius scale sets the freezing point of water at 0 °C and its boiling point at 100 °C (at sea level). It is used for everyday temperatures in almost every country.
Related conversions
Frequently asked questions
What is 104 Fahrenheit in Celsius?
104 degrees Fahrenheit is 40 degrees Celsius (104 °F = 40 °C).
How do you convert 104 °F to °C?
Apply °C = (°F − 32) × 5/9: °C = (104 − 32) × 5/9, °C = 72 × 5/9, °C = 40.
How many degrees Fahrenheit is 40 °C?
40 °C is about 104 degrees Fahrenheit.