Convert fahrenheit to celsius instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Fahrenheit-to-Celsius conversion is essential for reading US recipes, oven dials, and weather reports if you're used to Celsius. The formula is °C = (°F − 32) × 5/9 — note the subtraction happens first, a common source of calculation errors when people try to do it by hand. Cooking is where this matters most in practice: US oven temperatures are almost always round numbers in Fahrenheit (325°F, 350°F, 375°F) that convert to distinctly non-round Celsius values, so a recipe converted badly can throw off baking times if it's been rounded incorrectly along the way.
How to convert fahrenheit to celsius
Multiply by 0.5555555556, then add -17.7778.
°C = (°F × 0.5555555556) + -17.7778Example: 10 °F = -12.2222 °C.
Fahrenheit to Celsius conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| 1 °F | -17.2222 °C |
| 2 °F | -16.6667 °C |
| 3 °F | -16.1111 °C |
| 4 °F | -15.5556 °C |
| 5 °F | -15 °C |
| 10 °F | -12.2222 °C |
| 15 °F | -9.4444 °C |
| 20 °F | -6.6667 °C |
| 25 °F | -3.8889 °C |
| 50 °F | 10 °C |
| 100 °F | 37.7778 °C |
Frequently asked questions
How many celsius is 1 degree Fahrenheit?
1 degree Fahrenheit equals -17.2222 celsius.
What is the formula to convert °F to °C?
To convert °F to °C, multiply by 0.5555555556 and add -17.7778. The full formula is: °C = (°F × 0.5555555556) + -17.7778.
How do I convert celsius back to fahrenheit?
Use the same calculator above and type your value into the celsius field instead — it converts in both directions. Or use the reverse formula: °F = (°C − -17.7778) ÷ 0.5555555556.
Is the °F to °C conversion exact?
The conversion factor used here (0.5555555556) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.