Fahrenheit to Celsius Calculator
Convert Fahrenheit to Celsius instantly with our free calculator. Enter any °F temperature and get the exact °C equivalent with step-by-step formula.
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Purpose
Convert Fahrenheit to Celsius quickly and accurately with this free calculator. If you're in the United States and need to understand temperatures from international weather reports, recipes, or scientific data, this tool makes conversion effortless.
Fahrenheit (°F) is the standard temperature scale in the US, while Celsius (°C) is used by most other countries and in scientific contexts. This calculator helps bridge that gap instantly.
How to use
- Enter your Fahrenheit temperature in the input field
- View the Celsius result instantly below
Common Fahrenheit Temperatures:
- 32°F = 0°C (water freezes)
- 72°F = 22°C (comfortable room temperature)
- 98.6°F = 37°C (normal body temperature)
- 212°F = 100°C (water boils)
Examples
Example 1: Convert 72°F (room temperature) to Celsius
°C = (72 - 32) × 5/9 = 40 × 5/9 = 22.22°C
Example 2: Convert 98.6°F (body temperature) to Celsius
°C = (98.6 - 32) × 5/9 = 66.6 × 5/9 = 37°C
Example 3: Convert 0°F to Celsius
°C = (0 - 32) × 5/9 = -32 × 5/9 = -17.78°C
How it works
Fahrenheit to Celsius Formula:
°C = (°F - 32) × 5/9
How it works:
- Subtract 32 from the Fahrenheit temperature
- Multiply the result by 5/9 (or divide by 1.8)
The subtraction of 32 accounts for the offset between the two scales (water freezes at 32°F but 0°C). The multiplication by 5/9 converts the scale ratio since Fahrenheit degrees are smaller than Celsius degrees.
FAQ
What is the formula to convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9 (or divide by 1.8). The formula is: °C = (°F - 32) × 5/9. For example, 68°F = (68 - 32) × 5/9 = 20°C.
What is 72 degrees Fahrenheit in Celsius?
72°F equals approximately 22.2°C. This is considered a comfortable room temperature. The calculation: (72 - 32) × 5/9 = 22.22°C.
What is 100 degrees Fahrenheit in Celsius?
100°F equals approximately 37.8°C. This is slightly above normal human body temperature (98.6°F = 37°C). The calculation: (100 - 32) × 5/9 = 37.78°C.
Is there a quick way to estimate Fahrenheit to Celsius?
Yes! For a rough estimate: subtract 30 and divide by 2. For example, 70°F: (70-30)/2 = 20°C. The actual answer is 21.1°C, so it's close enough for everyday use.
Why is Fahrenheit used in the United States?
The US adopted Fahrenheit in the colonial era when it was the standard in English-speaking countries. While most nations switched to Celsius in the 1970s as part of metric system adoption, the US retained Fahrenheit for everyday use due to the high cost of changing infrastructure and public familiarity.