-21 Celsius in Fahrenheit = -5.8°F

-21 degrees Celsius — also 252.15 K

°C
°F

-21°C = -5.8°F

Quick answer
-21°C = -5.8°F = 252.15 K

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. Formula: °F = (°C × 9/5) + 32.
What is -21°C in Kelvin?
-21°C equals 252.15 K. Add 273.15 to convert Celsius to Kelvin.
How do I convert -21°C to Fahrenheit?
Multiply -21 by 9/5 (-37.8), then add 32. Result: -5.8°F.
What is the formula to convert Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. For Kelvin: K = °C + 273.15.