Convert Fahrenheit to Celsius
Converting Fahrenheit to Celsius? This is essential for understanding US weather reports, American recipes, or medical temperatures when you're used to the metric system. The formula is °C = (°F - 32) × 5/9, and our converter gives you instant, accurate results.
32°F = 0°C (freezing), 68°F = 20°C (room temp), 98.6°F = 37°C (body temp), 212°F = 100°C (boiling).
Conversion Formula
To convert Fahrenheit to Celsius: subtract 32, then multiply by 5/9 (or divide by 1.8). The subtraction accounts for the different zero points of the two scales.
Reference Table
| Fahrenheit | Celsius | Context |
|---|---|---|
| -40 °F | -40 °C | -40°F (where scales meet) |
| 32 °F | 0 °C | 32°F (water freezes) |
| 50 °F | 10 °C | 50°F (cool day) |
| 68 °F | 20 °C | 68°F (room temperature) |
| 77 °F | 25 °C | 77°F (warm day) |
| 86 °F | 30 °C | 86°F (hot day) |
| 98.6 °F | 37 °C | 98.6°F (body temperature) |
| 212 °F | 100 °C | 212°F (water boils) |
Real-World Uses
Understanding US Weather
When Americans say "it's 80 degrees," that's about 27°C — a warm summer day.
Cooking
Converting American recipes: 350°F = 177°C, 375°F = 190°C, 400°F = 204°C.
Medical
A fever of 102°F equals 38.9°C. Normal body temp (98.6°F) = 37°C.
Travel
Packing for a US trip? 60°F = 15°C (bring a jacket), 80°F = 27°C (summer clothes).
Common Mistakes to Avoid
Forgetting to subtract 32 first
Always subtract 32 before multiplying. The order matters!
Dividing by 9/5 instead of 5/9
F to C uses 5/9 (about 0.56). C to F uses 9/5 (1.8). Don't mix them up.
Thinking 100°F is boiling
100°F is only 37.8°C — about body temperature. Water boils at 212°F.
Frequently Asked Questions
What is 72°F in Celsius?
72°F equals about 22°C — a comfortable room temperature.
Is there a quick way to estimate F to C?
Subtract 30, then divide by 2. Example: 80°F → (80-30)/2 = 25°C (actual: 26.7°C). Good for quick estimates!
Why does the US use Fahrenheit?
Historical reasons. The US adopted Fahrenheit before Celsius became the global standard. Most of the world now uses Celsius.