15 Fahrenheit to Celsius
15 °F ≈ -9.44 °C
15 degrees Fahrenheit is approximately -9.44 degrees Celsius.
How to convert 15 °F to °C
Use the formula °C = (°F − 32) × 5/9:
°C = (15 − 32) × 5/9°C = -17 × 5/9°C = -9.444444
So 15 °F = -9.444444 °C, or about -9.44 °C rounded.
Rounded values and quick estimate
- Rounded to a whole number: -9 °C
- Rounded to one decimal place: -9.4 °C
Quick mental estimate: subtract 30 and halve it. For 15 °F that gives about -7.5 °C — off by 1.94 °C (20.6%). Use the exact formula when precision matters.
15 Fahrenheit in other units
-9.44 °C is below the freezing point of water (0 °C / 32 °F), so expect ice and frost. In weather terms it is a cold winter day.
- Celsius
- -9.44 °C
- Degrees Réaumur
- -7.56 °Ré
- Degrees Delisle
- 164.17 °De
- Degrees Newton
- -3.12 °N
- Degrees Rømer
- 2.54 °Rø
- Kelvin
- 263.71 K
- Rankine
- 474.67 °R
15 °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 15 Fahrenheit in Celsius?
15 degrees Fahrenheit is about -9.44 degrees Celsius (15 °F ≈ -9.44 °C).
How do you convert 15 °F to °C?
Apply °C = (°F − 32) × 5/9: °C = (15 − 32) × 5/9, °C = -17 × 5/9, °C = -9.444444.
How many degrees Fahrenheit is -9.44 °C?
-9.44 °C is about 15.01 degrees Fahrenheit.