Celsius to Fahrenheit Calculator
Instantly convert temperatures between Celsius and Fahrenheit with our easy-to-use tool. Perfect for cooking, weather, and medical use.
Temperature Converter
Conversion Formula
The formula to convert Celsius to Fahrenheit is:
And to convert Fahrenheit to Celsius:
Quick approximation: Double the Celsius temperature and add 30 to get a rough estimate in Fahrenheit.
Common Temperature Conversions
For a comprehensive list of conversions, check out our complete temperature chart.
| Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
| -40 | -40 | Extremely cold |
| 0 | 32 | Water freezing point |
| 20 | 68 | Room temperature |
| 37 | 98.6 | Normal body temperature |
| 100 | 212 | Water boiling point |
Body Temperature Guide
When converting body temperature for medical purposes, precision is important. Here are common fever reference points:
| Celsius (°C) | Fahrenheit (°F) | Medical Indication |
|---|---|---|
| 36.5 - 37.2 | 97.7 - 99.0 | Normal range |
| 37.3 - 38.0 | 99.1 - 100.4 | Low-grade fever |
| 38.1 - 39.0 | 100.6 - 102.2 | Moderate fever |
| 39.1 - 41.0 | 102.4 - 105.8 | High fever |
Disclaimer: This information is for reference only. Always consult a healthcare professional for medical advice.
Frequently Asked Questions
Use the formula: °F = (°C × 9/5) + 32. For example, to convert 40 Celsius to Fahrenheit: (40 × 9/5) + 32 = 104°F. Our calculator above does this instantly for any temperature.
The Fahrenheit and Celsius scales have different zero points and degree sizes. The ratio of degree sizes is 9/5 (each Fahrenheit degree is 5/9 of a Celsius degree), and the 32 accounts for the offset between the two scales at their zero points.
At -40 degrees, the Celsius and Fahrenheit scales are equal: -40°C = -40°F.
For a quick approximation, double the Celsius temperature and add 30. This method gives you a close estimate for everyday temperatures. For example, 20°C × 2 = 40, + 30 = 70°F (actual value is 68°F). For precise conversion, use the exact formula: °F = (°C × 9/5) + 32.
To convert Fahrenheit to Celsius, use the formula: °C = (°F - 32) × 5/9. For example, to convert 100°F to Celsius: (100 - 32) × 5/9 = 37.8°C. For a quick approximation, subtract 30 from the Fahrenheit temperature and divide by 2. This gives a close estimate for everyday temperatures.