Step by step
- Select Celsius (°C) in From and Fahrenheit (°F) in To on the converter.
- Type -20 (with the minus sign) into the Value box.
- Read the result (−4 °F) and the formula right below.
- Press Swap units to convert negative Fahrenheit values like −10 °F back to °C.
At a glance
| Celsius | Fahrenheit | Context |
|---|---|---|
| −40 °C | −40 °F | Point where both scales match |
| −20 °C | −4 °F | Deep winter cold or home freezer |
| −17.8 °C | 0 °F | Zero on the Fahrenheit scale |
| −10 °C | 14 °F | Freezing winter day |
| 0 °C | 32 °F | Water freezing point |
Related questions
How do you convert −20 °C to °F?
Multiply −20 by 1.8 to get −36, then add 32 to reach −4 °F.
What is 0 °F in Celsius?
0 °F is −17.78 °C (about −17.8 °C). Subtract 32 from 0 to get −32, then multiply by 5/9.
What is the lowest temperature the converter accepts?
It rejects anything below absolute zero (−273.15 °C), because temperatures lower than that cannot exist.
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Updated November 14, 2026.