How many degrees Fahrenheit is 100 degrees Celsius?

The story behind the answer

Use the conversion F = (9/5)C + 32. For 100°C: (9/5)×100 + 32 = 180 + 32 = 212°F. At standard atmospheric pressure, water boils at 100°C, which corresponds to 212°F. The Fahrenheit scale sets freezing at 32°F and boiling at 212°F—a 180-degree span—while Celsius uses 0°C and 100°C, a 100-degree span; that’s why the conversion factor is 9/5.

Memory tips: C → F is “×1.8, then +32,” or remember the anchors 0°C = 32°F and 100°C = 212°F. A quick mental estimate is “double the Celsius and add 30” (good near room temperature). Bonus: 451°F (a common distractor) is about 233°C, famously cited as paper’s ignition temperature.