Fahrenheit to Celsius Converter

Step 1: Enter the value you want to convert in the input field.

Step 2: Click Calculate. The result shows the converted value in Celsius. The breakdown shows the input value and the conversion factor used.

Fahrenheit is the primary temperature scale in the US, while Celsius is used by the rest of the world and in all scientific contexts. Weather forecasts, cooking temperatures, medical thermometers, and HVAC settings all require conversion when traveling or following international sources.

Common uses for this conversion: weather temperatures, cooking/oven temperatures, body temperature, HVAC settings, scientific data, travel planning.

Daniel Fahrenheit created his scale in 1724, setting 0° at the coldest temperature he could achieve (a salt-ice-water mixture) and 96° at human body temperature. Anders Celsius proposed his scale in 1742 with 0° at water's boiling point and 100° at freezing — later reversed to the modern convention. The Celsius scale is part of the metric system and used in science worldwide.

°C = (°F − 32) × 5/9

Subtract 32 from the Fahrenheit temperature, then multiply by 5/9 (or 0.5556).

To convert back (°C to °F): °F = (°C × 9/5) + 32

Quick mental math: Subtract 30, then divide by 2. This gives an approximate result: 80°F → (80-30)/2 = 25°C (actual: 26.7°C). Close enough for weather estimates.

Example 1: Body Temperature
Enter 98.6. Result: 37°C — normal body temperature. (98.6 − 32) × 5/9 = 66.6 × 0.5556 = 37°C.

Example 2: Oven Temperature
Enter 375. Result: 190.56°C — standard baking temperature. (375 − 32) × 5/9 = 343 × 0.5556 = 190.56°C.

Example 3: Weather
Enter 85. Result: 29.44°C — a warm summer day. (85 − 32) × 5/9 = 53 × 0.5556 = 29.44°C.

Memorize key reference points. 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temp), 20°C = 68°F (room temp). These anchors help you estimate without calculating.

Use the "subtract 30, divide by 2" shortcut. For weather: 80°F → (80-30)/2 = 25°C. Not exact, but close enough for daily use.

Oven temperatures in recipes: US recipes use °F, European use °C. 350°F = 177°C, 375°F = 191°C, 400°F = 204°C, 425°F = 218°C, 450°F = 232°C.

−40° is the same in both scales. The only temperature where Fahrenheit and Celsius are equal. Below that, °F values are lower than °C.