The main difference between Fahrenheit and Celsius is their relative values for both the freezing points and boiling points. This causes nearly all other temperature points on the thermometer to be different as well. Celsius is considered a world standard because of its ease of use, but a significant number of countries still operate on the Fahrenheit system for many applications, such as weather information and cooking. It should be noted that the reference to freezing and boiling is for water.
Fahrenheit and Celsius both are easily understandable, but the freezing and boiling points are harder to remember for Fahrenheit, simply because they are so awkwardly placed on the scale. This is the main reason the Celsius scale has come into widespread use.
The freezing points on these scales are generally better known than the boiling points, at least to the common person. This is because both are very important weather-related points. On the Celsius scale, the freezing point is listed as 0°. The freezing point on the Fahrenheit scale is 32°.
Likewise, the boiling points are also different, with the easier number being 100°, which is the boiling point on the Celsius scale. On the Fahrenheit scale, the boiling point is 212°. Given the rounded number for Celsius, it can help make many calculations much easier when considering the boiling point.
While the advantages often favor the Celsius system, there is a major disadvantage to the Celsius scale. The actual temperature variation between natural number points is greater on the Celsius system, simply because there are fewer natural number points between freezing and boiling. Therefore, to be more exact in the actual temperature, decimals and fractions become more important in the Celsius system.
Converting Fahrenheit and Celsius to each respective scale requires the use of a simple mathematical formula. To convert Celsius to Fahrenheit, (add number)°C x 9/5 + 32 = (result)°F. To convert Fahrenheit to Celsius, (add number°F-32) x 5/9 = result°C.
There are also a number of calculators online easily found by doing a search that will automatically convert one temperature to the other.