30°F to °C — What is 30 Fahrenheit in Celsius?

30°F = -1.11°C. Use the exact formula (°F − 32) × 5/9 to convert any Fahrenheit temperature to Celsius — algebraically exact with zero rounding, as defined by the NIST.

Answer

-1.11°C

30 °F = -1.11 °C

Exact: -1.110000 °C · uses the BIPM-defined constant

How it's calculated

(°F − 32) × 5/9 = °C

Step 1: Apply the formula to the input value.
Step 2: (30 − 32) × 5/9 = -2 × 5/9 = -1.11

What does 30°F feel like?

30°F is at or below the freezing point of water (32°F). Ice forms on roads and surfaces at 32°F. Wind chill at 30°F in moderate wind can feel significantly colder, increasing frostbite risk for exposed skin.

30°F in other temperature scales

Celsius

-1.11°C

Fahrenheit

30°F

Kelvin

272.04 K

Common temperature references

Key temperatures from science, cooking, and medicine

°C	°F	Reference
-40°C	-40°F	°C and °F are equal
-18°C	0°F	Zero Fahrenheit
0°C	32°F	Water freezes
10°C	50°F	Cool day
20°C	68°F	Room temperature
25°C	77°F	Warm room
37°C	98.6°F	Body temperature
38°C	100.4°F	Fever threshold (WHO)
100°C	212°F	Water boils (sea level)
160°C	320°F	Low oven
180°C	356°F	Moderate oven (Gas Mark 4)
200°C	392°F	Hot oven (Gas Mark 6)
220°C	428°F	Very hot oven (Gas Mark 7)
250°C	482°F	Max home oven

Fahrenheit to Celsius — Nearby Values

Click any row to open its full conversion page

Fahrenheit (°F)	Celsius (°C)
20 °F	-6.67 °C
30 °Fthis page	-1.11 °C
32 °F	0 °C
40 °F	4.44 °C

Common questions about 30 °F to °C

What is 30°F in Celsius?

30 degrees Fahrenheit equals exactly -1.11 degrees Celsius. The formula is (30 − 32) × 5/9 = -1.11°C. In Kelvin, this is 272.04 K.

How do you convert 30°F to °C step by step?

Step 1: Subtract 32 from 30 to get -2. Step 2: Multiply by 5/9 (or 0.5556). Result: -2 × 5/9 = -1.11°C. This formula is algebraically exact.

Is 30°F hot or cold?

30°F is below freezing. Water freezes at 32°F; expect ice and snow conditions.

What is -1.11°C back in Fahrenheit?

-1.11°C converts back to exactly 30°F — which is 30°F. The conversion is perfectly reversible using the inverse formula: (°C × 9/5) + 32.

What should I wear at 30°F?

At 30°F, a heavy coat or insulated jacket is needed. Add a scarf, warm hat, and gloves for extended time outside. Layer a jumper or fleece underneath.