The Fahrenheit equivalent of 17 degrees Celsius is approximately 63 degrees. The formula for converting from Celsius to Fahrenheit is F = (9/5) C +32. Converting from Fahrenheit to Celsius requires using the formula C = (5/9)(F - 32).
In the United States, the Fahrenheit scale is the most common one used for temperatures. This scale, developed by Daniel Gabriel Fahrenheit, set the temperature of a mixture of ammonium chloride, ice and water as the zero point, the temperature of a mix of ice and water at 32 degrees Fahrenheit and the human body temperature at 96 degrees Fahrenheit; upon recalibration, the body's temperature was reset at 98.6 degrees Fahrenheit. Fahrenheit was the inventor of the mercury thermometer, which provided greater accuracy than alcohol thermometers.
Most countries outside the United States prefer the Celsius scale. The Celsius scale sets its zero point at the freezing point of water and the boiling point of water at sea level as 100 degrees. The Kelvin temperature scale uses the same increments to measure temperature, but has a zero point at absolute zero, which is minus 273.15 degrees Celsius.
Until 1948, the world knew the Celsius scale as the centigrade temperature scale. However, due to the potential for confusion with other units, the international standards bodies adopted the name Celsius. Centigrade continued in common use for several decades after the recommended change, with the BBC refusing to adopt Celsius for weather reports until 1985.