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To convert Celsius to Fahrenheit, multiply by 9/5 (1.8) and add 32. So 0°C = 32°F (freezing), 100°C = 212°F (boiling), and 37°C = 98.6°F (body temperature). A quick mental estimate: double the Celsius value and add 30 — e.g. 20°C → 40 + 30 = 70°F (actual: 68°F), accurate to within a few degrees.
The United States uses Fahrenheit for weather forecasts, cooking, and everyday temperature reference, while nearly every other country uses Celsius. A comfortable 20°C summer day is 68°F. An oven preheated to 180°C in a European recipe corresponds to 356°F in an American oven.
Did you know? Anders Celsius originally defined 0 as the boiling point of water and 100 as freezing — the reverse of today's scale. After his death in 1744, the scale was inverted to its modern form.
Cooking from US recipes requires Fahrenheit oven temperatures. Checking weather forecasts when visiting or living in the US. Monitoring body temperature with a US-format thermometer. Understanding US product safety warnings that list temperature limits in Fahrenheit.