Convert Celsius to Fahrenheit
Convert Celsius to Fahrenheit using the F = C × 9/5 + 32 formula. Includes weather, cooking, body temperature, and scientific reference points.
Temperature
Detailed Explanation
Celsius to Fahrenheit Conversion
The formula is:
°F = °C × 9/5 + 32
Or equivalently: multiply by 1.8, then add 32.
Key Reference Points
| °C | °F | Significance |
|---|---|---|
| -40 | -40 | Where both scales meet |
| -18 | 0 | Very cold winter day |
| 0 | 32 | Water freezes |
| 10 | 50 | Cool autumn day |
| 20 | 68 | Room temperature |
| 25 | 77 | Warm comfortable day |
| 30 | 86 | Hot summer day |
| 37 | 98.6 | Normal body temperature |
| 40 | 104 | Heat wave / high fever |
| 100 | 212 | Water boils (sea level) |
| 180 | 356 | Baking temperature |
| 200 | 392 | High oven |
Weather Conversion
For daily weather, knowing a few key ranges helps:
- Below 0°C (32°F): Freezing, icy conditions
- 0–10°C (32–50°F): Cold, need winter coat
- 10–20°C (50–68°F): Cool, light jacket
- 20–30°C (68–86°F): Warm and comfortable
- Above 30°C (86°F): Hot
The "Double and Add 30" Trick
For a quick rough estimate: double the Celsius value and add 30.
- 20°C → (20 × 2) + 30 = 70°F (exact: 68°F)
- 30°C → (30 × 2) + 30 = 90°F (exact: 86°F)
This shortcut is most accurate between 0°C and 30°C.
Cooking Temperatures
Oven temperatures in recipes vary by region:
| °C | °F | Description |
|---|---|---|
| 120 | 250 | Very low / slow |
| 150 | 300 | Low |
| 180 | 350 | Moderate |
| 200 | 400 | Moderately hot |
| 220 | 425 | Hot |
| 240 | 475 | Very hot |
Use Case
A traveler from a Celsius-using country checking weather forecasts in the United States needs to quickly understand Fahrenheit temperature readings.