0°F to °C — What is 0 Fahrenheit in Celsius?

0°F = -17.78°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

-17.78°C

0 °F = -17.78 °C

Exact: -17.780000 °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: (0 − 32) × 5/9 = -32 × 5/9 = -17.78

What does 0°F feel like?

0°F is at or below the freezing point of water (32°F). Ice forms on roads and surfaces at 32°F. Wind chill at 0°F in moderate wind can feel significantly colder, increasing frostbite risk for exposed skin.

0°F in other temperature scales

Celsius

-17.78°C

Fahrenheit

0°F

Kelvin

255.37 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)
0 °Fthis page	-17.78 °C
10 °F	-12.22 °C

Common questions about 0 °F to °C

What is 0°F in Celsius?

0 degrees Fahrenheit equals exactly -17.78 degrees Celsius. The formula is (0 − 32) × 5/9 = -17.78°C. In Kelvin, this is 255.37 K.

How do you convert 0°F to °C step by step?

Step 1: Subtract 32 from 0 to get -32. Step 2: Multiply by 5/9 (or 0.5556). Result: -32 × 5/9 = -17.78°C. This formula is algebraically exact.

Is 0°F hot or cold?

0°F is below freezing. Water freezes at 32°F; expect ice and snow conditions.

What is -17.78°C back in Fahrenheit?

-17.78°C converts back to exactly 0°F — which is 0°F. The conversion is perfectly reversible using the inverse formula: (°C × 9/5) + 32.

What should I wear at 0°F?

At 0°F, layer up: thermal base, fleece mid-layer, insulated waterproof jacket. Warm hat, gloves, and insulated boots are essential. Cover all exposed skin.