0 Fahrenheit to Celsius
0 °F equals approximately -17.78 °C. Change the value, swap Celsius and Fahrenheit, or copy the result with its formula.
Best solution
Default conversion: 0 °F is approximately -17.78 °C; exact result: -160/9 °C.
Temperature reading · up to 2 decimal places
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Calculation for 0 °F
(0 − 32) × 5/9 = -32 × 5/9 = -160/9 °C = -17.778… °C ≈ -17.78 °C.
The exact result is -160/9 °C. In decimal form, it is approximately -17.78 °C.
For a temperature reading, use °F = °C × 9/5 + 32, or °C = (°F − 32) × 5/9. Results are displayed to at most two decimal places. Negative values are allowed down to −273.15 °C or −459.67 °F (absolute zero). The calculator converts readings, not temperature changes: a change of 1 °C is a change of 1.8 °F, with no 32-degree offset. NIST temperature conversion reference.
Changing the input updates the calculator only; the worked example below it stays on the value named in this page. Swap uses the displayed, rounded result as the next input, so repeated swaps may introduce a small rounding difference. Unit conversion does not determine a diagnosis or a recommended device setting.
Real-World Context & Technical Standards
Daniel Gabriel Fahrenheit's Scale Zero
In 1724, Fahrenheit calibrated 0 °F (−17.78 °C) as the lowest freezing temperature of a balanced ammonium chloride and water brine solution.
Standard Home Freezer Setting
The FDA and modern appliance standards designate 0 °F (−18 °C) as the universally recommended operating baseline for residential freezers.
Related conversions
Frequently Asked Questions
How do I convert 0 °F to °C?
(0 − 32) × 5/9 = -32 × 5/9 = -160/9 °C = -17.778… °C ≈ -17.78 °C.
Is -17.78 °C exact or rounded?
The exact result is -160/9 °C. In decimal form, it is approximately -17.78 °C.