-4 Fahrenheit to Celsius
-4 °F = -20 °C
-4 degrees Fahrenheit equals -20 degrees Celsius.
How to convert -4 °F to °C
Use the formula °C = (°F − 32) × 5/9:
°C = (-4 − 32) × 5/9°C = -36 × 5/9°C = -20
So -4 °F = -20 °C.
Rounded values and quick estimate
- Rounded to a whole number: -20 °C
- Rounded to one decimal place: -20 °C
Quick mental estimate: subtract 30 and halve it. For -4 °F that gives about -17 °C — off by 3 °C (15%). Use the exact formula when precision matters.
-4 Fahrenheit in other units
-20 °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
- -20 °C
- Degrees Réaumur
- -16 °Ré
- Degrees Delisle
- 180 °De
- Degrees Newton
- -6.6 °N
- Degrees Rømer
- -3 °Rø
- Kelvin
- 253.15 K
- Rankine
- 455.67 °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 -20 degrees Celsius (-4 °F = -20 °C).
How do you convert -4 °F to °C?
Apply °C = (°F − 32) × 5/9: °C = (-4 − 32) × 5/9, °C = -36 × 5/9, °C = -20.
How many degrees Fahrenheit is -20 °C?
-20 °C is about -4 degrees Fahrenheit.