Fahrenheit to Celsius Converter

What Is a Fahrenheit to Celsius Converter?

Converting Fahrenheit to Celsius is a daily need for Americans living or traveling abroad, international students in the US trying to interpret weather forecasts, and cooks following recipes from different countries. The US weather system uses Fahrenheit exclusively, while virtually every other country reports temperature in Celsius. Understanding the conversion is also critical for cooking — American recipes specify oven temperatures in Fahrenheit (350°F, 400°F, 425°F) while European and Australian recipes use Celsius equivalents.

The Conversion Formula

The formula to convert fahrenheit to celsius is:

°C = (°F - 32) × 5/9

The reverse formula is: °F = (°C × 9/5) + 32

Fahrenheit to Celsius Reference Table

Fahrenheit (°F)	Celsius (°C)
-40 °F	-40.0 °C
0 °F	-17.8 °C
10 °F	-12.2 °C
20 °F	-6.7 °C
32 °F	0.0 °C
40 °F	4.4 °C
50 °F	10.0 °C
60 °F	15.6 °C
70 °F	21.1 °C
72 °F	22.2 °C
75 °F	23.9 °C
80 °F	26.7 °C
90 °F	32.2 °C
98.6 °F	37.0 °C
100 °F	37.8 °C
120 °F	48.9 °C
150 °F	65.6 °C
200 °F	93.3 °C
350 °F	176.7 °C
450 °F	232.2 °C

How to Use This Converter

Enter your fahrenheit value in the input field above.
View the result — the celsius equivalent appears instantly.
For manual conversion, use the formula: °C = (°F - 32) × 5/9.
Check the reference table above for 20 pre-calculated common values.

Conversion Tips

Subtract 30, then halve the result for a quick estimate. 72F becomes (72-30)/2 = 21C (actual: 22.2C). Good enough for weather conversations and thermostat decisions.
Clinical fever thresholds: 100.4F = 38.0C (fever in adults), 104F = 40C (high fever, seek medical attention). When traveling with children, know both scales for communicating with local healthcare providers.
Refrigerator temperature should be 35-38F (1.7-3.3C) and freezer at 0F (-17.8C). These are the FDA-recommended food safety temperatures. Most international appliances display Celsius only.

Related Conversions

All conversions are calculated client-side in your browser. No data is sent to any server. For the authoritative source on unit definitions, see the National Institute of Standards and Technology (NIST).

Frequently Asked Questions

What is the formula for Fahrenheit to Celsius?

The formula is °C = (°F - 32) × 5/9. Subtract 32 from the Fahrenheit temperature, then multiply by 0.5556. For example, 72°F: (72 - 32) × 5/9 = 40 × 0.5556 = 22.2°C.

What is room temperature in Celsius?

Standard room temperature is 68-72°F, which equals 20-22.2°C. HVAC systems in the US typically target 72°F (22.2°C) as the comfort standard. In metric countries, thermostat settings of 20-22°C are standard.

What oven temperatures should I know in Celsius?

Common oven conversions: 350°F = 177°C (standard baking), 375°F = 191°C, 400°F = 204°C, 425°F = 218°C, 450°F = 232°C. Most American recipes use Fahrenheit while European recipes use Celsius.

How do I quickly estimate Fahrenheit to Celsius?

Subtract 30, then divide by 2. Example: 80°F → (80-30)/2 = 25°C (actual: 26.7°C). This shortcut works within a few degrees for temperatures between 30-100°F.

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