What percentage of the world uses Fahrenheit?

Answer 1

Approximately 303.8 million (US Population) out of 6.75 billion (world's population) or 4.5%. Beyond your question, I note the following: In scientific publications, degrees centigrade or Kelvin is used, and I don't know of an exception. In some publications, both units are given. In trade journal printed in the US, sometimes units are given only in degrees Fahrenheit. My research of other countries which use Fahrenheit include Liberia, Myanmar and Belize. I am not sure if the information is up to date, but it would not change the percentage as given above. In this age of computer, unit translation from metric to non-metric is done so easily that it is less of a problem today, as computer programs allow the user to select units. The confusion of units is rare in terms of normal weather conditions. I note that in other countries, when it's a nice day out, and they state the temperature is 25 degrees, you know they are not talking about Fahrenheit.