4 Fahrenheit to Celsius
4 °F ≈ -15.56 °C
4 degrees Fahrenheit is approximately -15.56 degrees Celsius.
How to convert 4 °F to °C
Use the formula °C = (°F − 32) × 5/9:
°C = (4 − 32) × 5/9°C = -28 × 5/9°C = -15.555556
So 4 °F = -15.555556 °C, or about -15.56 °C rounded.
Rounded values and quick estimate
- Rounded to a whole number: -16 °C
- Rounded to one decimal place: -15.6 °C
Quick mental estimate: subtract 30 and halve it. For 4 °F that gives about -13 °C — off by 2.56 °C (16.4%). Use the exact formula when precision matters.
4 Fahrenheit in other units
-15.56 °C is very cold weather, well below the freezing point of water. It is typical of a hard winter in northern climates; warm layers, gloves and a hat are essential outdoors.
- Celsius
- -15.56 °C
- Degrees Réaumur
- -12.44 °Ré
- Degrees Delisle
- 173.33 °De
- Degrees Newton
- -5.13 °N
- Degrees Rømer
- -0.6667 °Rø
- Kelvin
- 257.59 K
- Rankine
- 463.67 °R
4 °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 4 Fahrenheit in Celsius?
4 degrees Fahrenheit is about -15.56 degrees Celsius (4 °F ≈ -15.56 °C).
How do you convert 4 °F to °C?
Apply °C = (°F − 32) × 5/9: °C = (4 − 32) × 5/9, °C = -28 × 5/9, °C = -15.555556.
How many degrees Fahrenheit is -15.56 °C?
-15.56 °C is about 3.99 degrees Fahrenheit.