-21 Celsius in Fahrenheit = -5.8°F

-21 degrees Celsius

°C
°F

(-21 × 9/5) + 32 = -5.8°F

Quick answer
-21°C = -5.8°F. Multiply by 9/5 then add 32.

Reference points

0°C = 32°F
Freezing point
37°C = 98.6°F
Body temp
100°C = 212°F
Boiling point

Nearby conversions

-25°C → -13°F -24°C → -11.2°F -23°C → -9.4°F -22°C → -7.6°F -20°C → -4°F -19°C → -2.2°F -18°C → -0.4°F -17°C → 1.4°F

Frequently asked questions

What is -21 degrees Celsius in Fahrenheit?
-21°C equals -5.8°F. This is calculated using the formula: °F = (°C × 9/5) + 32.
How do I convert -21°C to Fahrenheit?
Multiply -21 by 9 divided by 5 (which equals -37.8), then add 32. The result is -5.8°F.
Is -21°C hot or cold?
At -21°C (-5.8°F), this is extremely cold — well below freezing and dangerous without proper clothing.
What is the formula to convert Celsius to Fahrenheit?
The formula is: °F = (°C × 9/5) + 32. You can also use the approximation: double the Celsius value and add 30 for a quick estimate.