Unit of Measure Conversions

Temperature

Temperature Scale Conversions

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Additional Units and Information

* At 1 atm pressure (760 mm mercury)
Name Symbol Value Description/Notes
Celsius °C   Ice melts at 0°C*
Water boils at 100°C*
Fahrenheit °F   Ice melts at 32°F*
Water boils at 212°F*
Kelvin K 1 K = 1°C in size Ice melts at 273 K*
Water boils at 373 K*
Rankine °R 1°R = 1°F in size Ice melts at 492°R*
Water boils at 672°R*
Réaumur °Ré   Ice melts at 0°Ré*
Water boils at 80°Ré*
    36.9°C;
98.4°F 		Normal body temperature
    4.0°C;
39.2°F 		Water density is at maximum*
    -273.15°C;
-459.67°F 		Absolute zero

Useful Approximations

Approximation % Accuracy
-15°C = 5°F 100
-10°C ≈ 15°F 92.9
-5°C ≈ 25°F 91.3
0°C ≈ 30°F 93.8
5°C ≈ 40°F 97.6
10°C = 50°F 100
15°C ≈ 60°F 98.3
20°C ≈ 70°F 97.1
25°C ≈ 75°F 97.4
30°C ≈ 85°F 98.8
35°C = 95°F 100
40°C ≈ 105°F 99.0
45°C ≈ 115°F 98.2
50°C ≈ 120°F 98.4
Readily Recalled Values % Accuracy
04°C ≈ 40°F (just swap digits) 98.0
16°C ≈ 61°F (swap digits) 99.7
28°C ≈ 82°F (swap digits) 99.5
40°C = 104°F (swap digits and prefix with 1) 100
52°C ≈ 125°F (swap digits and prefix with 1) 99.5