Fahrenheit to Celsius
Convert Fahrenheit to Celsius instantly.
How to Convert Fahrenheit to Celsius
To convert Fahrenheit to Celsius, subtract 32 then multiply by 5/9: °C = (°F − 32) × 5/9. This conversion is essential for Americans traveling abroad, reading international weather forecasts, cooking with international recipes that use Celsius, interpreting medical temperatures from non-US sources, and understanding scientific literature. Most of the world uses Celsius exclusively — making this one of the most practically useful conversions for US residents.
Fahrenheit to Celsius Reference Chart
Common conversions: 32°F = 0°C · 50°F = 10°C · 68°F = 20°C · 77°F = 25°C · 86°F = 30°C · 98.6°F = 37°C · 104°F = 40°C · 212°F = 100°C.
Frequently Asked Questions
What is the formula for Fahrenheit to Celsius?
°C = (°F − 32) × 5/9. For a quick mental estimate, subtract 32 then halve the result — this oversimplifies slightly but gives a useful ballpark. For example, 72°F: (72−32)/2 = 20°C (exact answer is 22.2°C).
What is 72°F in Celsius?
(72 − 32) × 5/9 = 40 × 5/9 = 22.2°C. A temperature of 72°F (22°C) is often cited as the ideal indoor comfort temperature — a standard setting for office thermostats and building climate control systems.
What is a fever in Celsius?
A normal body temperature is 37°C (98.6°F). A fever is generally defined as a temperature above 38°C (100.4°F). A high fever requiring medical attention is typically above 39.4°C (103°F). Knowing these Celsius equivalents is important for parents and travelers in countries where thermometers display Celsius.
What is 100°F in Celsius?
(100 − 32) × 5/9 = 68 × 5/9 = 37.8°C. A temperature of 100°F is just above normal body temperature, which is why a reading of 100°F is considered a low-grade fever. It is also close to a very hot day — temperatures above 38–40°C (100–104°F) are dangerous for outdoor workers and the elderly.