About temperature converter
Temperatures are reported in Celsius, Fahrenheit, Kelvin and Rankine. The converter changes between them.
Formulas
- °F = °C × 9/5 + 32.
- °C = (°F − 32) × 5/9.
- K = °C + 273.15.
Reference points
Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level. Normal body temperature is about 37 °C (98.6 °F).
A worked example
Normal body temperature, 98.6 °F, is 37 °C. A hot summer day of 45 °C is 113 °F. Room temperature of 300 K is 26.85 °C. The coldest possible temperature, 0 K, is −273.15 °C or −459.67 °F.
Quick mental trick
To estimate °F from °C, double it and add 30. For 20 °C you get 70 °F, close to the exact 68 °F.
Everyday references
A comfortable room is about 22 °C (72 °F). Water boils at 100 °C (212 °F) at sea level. A fever is generally a body temperature of 38 °C (100.4 °F) or more.
