-20°C to Fahrenheit

-4°F

-20°C = -4°F = 253.15 K

Working: (-20 × 9/5) + 32 = -4

-20 degrees Celsius converts to -4 degrees Fahrenheit.

To convert Celsius to Fahrenheit, multiply by 9/5 (which is 1.8) and then add 32. For -20°C: -20 × 1.8 = -36, and -36 + 32 = -4. Going the other way, subtract 32 from the Fahrenheit value and multiply by 5/9.

If you only need a rough figure, double the Celsius number and add 30 — that gives -10°F here, which is 6 degrees off the exact -4°F. The shortcut is accurate enough for weather but not for cooking or medical use.

Twenty below is a working figure for freezer design and cold-chain logistics rather than a weather reading in most places. Commercial and domestic freezers are specified around −18 to −20°C, which is why frozen-food packaging quotes a storage temperature in this range on every market including imperial ones.

Nearby temperatures

Celsius	Fahrenheit
-40°C	-40°F
-10°C	14°F
0°C	32°F
5°C	41°F
10°C	50°F
15°C	59°F
20°C	68°F
25°C	77°F

Try another value

From

°C

77°F

All scales

Celsius (°C)25 °C

Fahrenheit (°F)77 °F

Kelvin (K)298.15 K

Frequently asked questions

What is -20 degrees Celsius in Fahrenheit?

-20°C is -4°F. Multiply -20 by 1.8 to get -36, then add 32 to get -4.

What is the formula for Celsius to Fahrenheit?

°F = (°C × 9/5) + 32. Multiply the Celsius temperature by 1.8, then add 32. To reverse it, subtract 32 first and then multiply by 5/9.

For any other value, use the full Temperature Converter on BrainVert.