Temperature Reference Sheet

Celsius (°C) — water-based: 0 °C freezing, 100 °C boiling.

Fahrenheit (°F) — common in the U.S.: 32 °F freezing, 212 °F boiling.

Kelvin (K) — absolute scale used in science; 0 K is absolute zero.

°C → °F: (°C × 9/5) + 32

°F → °C: (°F − 32) × 5/9

°C → K: °C + 273.15

K → °C: K − 273.15

Change: 1 °C = 1 K

Change: 1 °F = 5/9 °C

°C	°F	K
-40	-40	233.15
-20	-4	253.15
0	32	273.15
20	68	293.15
37	98.6	310.15
100	212	373.15

Water freezes: 0 °C = 32 °F = 273.15 K

Water boils (sea level): 100 °C = 212 °F = 373.15 K

Typical room temp: 20–22 °C ≈ 68–72 °F

Human body temp: ≈ 37 °C ≈ 98.6 °F

Point where °C = °F: −40