100 Degrees Fahrenheit to Celsius

The United States is one of the very few countries that still uses the Fahrenheit scale for everyday temperature. Almost everywhere else — and across all of science and medicine — Celsius is the standard. Fahrenheit-to-Celsius conversion is needed daily by travellers reading foreign weather apps, chefs following international recipes, healthcare workers interpreting body temperature readings, and engineers reviewing international specifications. This calculator handles any temperature: weather forecasts, oven settings, medical thresholds, industrial process temperatures, and sub-zero extremes. Enter any Fahrenheit value and get the precise Celsius equivalent instantly.

The formula is °C = (°F − 32) × 5/9. There are two steps. First, subtract 32 to remove the offset between the two scales — Fahrenheit sets 32 as the freezing point of water, while Celsius sets it at 0. This shift brings the two scales to the same reference point. Second, multiply by 5/9 (≈ 0.5556) to account for the different degree sizes: a Fahrenheit degree is only 5/9 the size of a Celsius degree, so the same temperature change that is 9 Fahrenheit degrees is only 5 Celsius degrees. The result is displayed to four decimal places. The reverse formula — converting Celsius to Fahrenheit — is °F = (°C × 9/5) + 32. Key reference temperatures worth knowing: water freezes at 32°F / 0°C, a comfortable room is approximately 68–72°F / 20–22°C, normal body temperature is 98.6°F / 37°C, and water boils at 212°F / 100°C at sea level.