Fahrenheit to Celsius Converter
Switch between Fahrenheit and Celsius scales with instant online F to C calculations. Enter values for precise temperature shifts.
Popular F to C Conversions
| Fahrenheit | Celsius | Context |
|---|---|---|
| 32°F | 0°C | Water freezes |
| 98.6°F | 37°C | Human body average |
| 212°F | 100°C | Water boils at sea level |
| 70°F | 21°C | Comfortable room |
| 350°F | 177°C | Moderate oven |
| -40°F | -40°C | Extreme cold match |
F to C Formula
From °F to °C: \[ \text{°C} = \frac{5}{9} \times (°F – 32) \]
From °C to °F: \[ \text{°F} = \frac{9}{5} \times °C + 32 \]
Step-by-Step for 77°F to °C
- Subtract 32: 77 – 32 = 45
- Multiply by 5/9: 45 × (5/9) = 25
- Result: 25°C
Visual F to C Scale
32°F
0°C
Scales aligned for freezing (0/32), body (37/98.6), boiling (100/212).
Global Scale Differences
United States uses Fahrenheit for daily weather and cooking recipes. Most other countries apply Celsius in forecasts, science, and metric systems. Canada mixes both officially. Europe sticks to Celsius exclusively.
F to C FAQ
Why -40°F equals -40°C?
Plug in: (°F – 32) × 5/9 = -40 for both due to exact crossover point.
Does this handle decimals?
Yes, enter like 72.5°F for 22.5°C precision.
What about negative temps?
Works for -10°F = -23.3°C or colder extremes.
Is the formula exact?
Yes, derived from absolute zero alignment where -459.67°F = -273.15°C.
References
- CalculatorSoup.com. Fahrenheit to Celsius conversion calculator. https://www.calculatorsoup.com/calculators/conversions/fahrenheit-to-celsius.php
- NASA Dryden Flight Research Center. Temperature conversion chart (PDF). https://weather.dfrc.nasa.gov/data/tempchart.pdf
- Reddit r/howto. Easy Fahrenheit to Celsius method discussion. https://www.reddit.com/r/howto/comments/195o4sf/easy_fahrenheit_to_celsius/
- National Institute of Standards and Technology (NIST). SI units temperature scales.