The main difference between Fahrenheit and Celsius is their relative values for both the freezing points and boiling points. This causes all other temperature points on the thermometer to be different as well. Celsius is considered a world standard because of its ease of use. However, 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. Also, Celsius is more in line with the metric system, also used in official scientific measurements, as its most important points are divisible by 10.

The freezing points on the Fahrenheit and Celsius 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 (zero). The freezing point on the Fahrenheit scale is 32.

Likewise, the boiling points are also different between Fahrenheit and Celsius, 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 between the Fahrenheit and Celsius scales 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 32 to the Celsius temperature and multiply by 1.8. To convert Fahrenheit to Celsius, subtract 32 and divide by 1.8. There are also a number of calculators online easily found by doing a search that will automatically convert Fahrenheit and Celsius.