In Germany temperature is usually stated using degrees Celsius. The common notation is °C. The freezing point and the boiling point of water was used to define the Celsius scale. This range was divided into 100 parts of the same size.
The United States of America use the different scale unit degrees Fahrenheit (°F). A temperature of 0°C correspong to 32°F. In contrast 0°F matches to -17,8°C. However 100°C correspond to 212°F and 100°F correspond to 37,8°C, which is approximately the body temperature of a human being.
This is the equation for the conversion of degrees Fahrenheit to degrees Celsius:
Temperature °C = 1 ⁄ 1,8⋅(temperatur °F) - 32 ⁄ 1,8
...and the equation from degrees Celsius to degrees Fahrenheit:
Temperature °F = 1,8⋅(temperature °C) + 32
The formula shows, that a temperature interval of 1°C correspond to a temperature interval of 1,8°F and 1°F is a temperature change of 0,55555...°C.
Use this online converter fo example for the conversion.