How to Convert Fahrenheit to Celsius

Converting Fahrenheit to Celsius is a skill that bridges the gap between the two most commonly used temperature scales in the world. The Fahrenheit scale, developed by Daniel Gabriel Fahrenheit in 1724, is primarily used in the United States for everyday temperature measurements. The Celsius scale, created by Anders Celsius in 1742, is the international standard used by virtually every other country and in all scientific work.

The formula to convert Fahrenheit to Celsius is: subtract 32 from the Fahrenheit temperature, then multiply by 5/9 (or approximately 0.5556). For example, a pleasant 72 degrees F day converts to about 22.2 degrees C. Room temperature of 68 degrees F is exactly 20 degrees C. A fever of 100 degrees F is approximately 37.8 degrees C. For a quick mental shortcut, subtract 30 and divide by 2 — this gives a rough but useful estimate for everyday temperatures.

This conversion is critical for international communication about weather, cooking, and health. When a doctor in a metric country asks for a patient's temperature and the thermometer reads in Fahrenheit, accurate conversion is needed. Cooks adjusting American recipe oven temperatures to metric ovens need this conversion daily. Our calculator also provides the Kelvin equivalent for scientific and engineering calculations.

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