30 Fahrenheit to Celsius
30 °F ≈ -1.11 °C
30 degrees Fahrenheit is approximately -1.11 degrees Celsius.
How to convert 30 °F to °C
Use the formula °C = (°F − 32) × 5/9:
°C = (30 − 32) × 5/9°C = -2 × 5/9°C = -1.111111
So 30 °F = -1.111111 °C, or about -1.11 °C rounded.
Rounded values and quick estimate
- Rounded to a whole number: -1 °C
- Rounded to one decimal place: -1.1 °C
Quick mental estimate: subtract 30 and halve it. For 30 °F that gives about 0 °C — off by 1.11 °C (100%). Use the exact formula when precision matters.
30 Fahrenheit in other units
-1.11 °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
- -1.11 °C
- Degrees Réaumur
- -0.8889 °Ré
- Degrees Delisle
- 151.67 °De
- Degrees Newton
- -0.3667 °N
- Degrees Rømer
- 6.92 °Rø
- Kelvin
- 272.04 K
- Rankine
- 489.67 °R
30 °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 30 Fahrenheit in Celsius?
30 degrees Fahrenheit is about -1.11 degrees Celsius (30 °F ≈ -1.11 °C).
How do you convert 30 °F to °C?
Apply °C = (°F − 32) × 5/9: °C = (30 − 32) × 5/9, °C = -2 × 5/9, °C = -1.111111.
How many degrees Fahrenheit is -1.11 °C?
-1.11 °C is about 30 degrees Fahrenheit.