Celsius to Fahrenheit Calculator
Use this C to F calculator to convert temperatures instantly between scales. Whether for medical fever checking, cooking, or science, get results with 100% accuracy using the official formula: °F = (°C × 1.8) + 32.
Conversion Formula
The standard formula to convert Celsius to Fahrenheit is:
To convert Fahrenheit to Celsius back:
Quick approximation: For a fast estimate without a calculator, double the Celsius temperature and add 30 to get the Fahrenheit value.
Common Temperature Conversions
Use this reference table for the most typical temperature points encountered in daily life:
How to Use the Temperature Converter
Our Celsius to Fahrenheit calculator is designed for speed and reliability. Simply follow these steps:
- Select the Mode: Toggle between °C to °F or °F to °C.
- Enter Value: Type your temperature in the input box.
- Instant Result: The converted value appears immediately as you type.
Looking for the underlying math? Visit our detailed Celsius to Fahrenheit formula guide.
Body Temperature & Fever Reference
| Celsius | Fahrenheit | Condition |
|---|---|---|
| 36.5 - 37.2°C | 97.7 - 99.0°F | Normal Range |
| 37.3 - 38.0°C | 99.1 - 100.4°F | Low-grade Fever |
| 38.1 - 39.0°C | 100.6 - 102.2°F | Moderate Fever |
| > 39.1°C | > 102.4°F | High Fever |
Note: Always use a clinical thermometer for health decisions. This tool is for quick conversion only.
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
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.
Why is the formula (°C × 9/5) + 32?
The Fahrenheit and Celsius scales have different zero points and degree sizes. The ratio of degree sizes is 9/5 (each Fahrenheit degree is 1.8 Celsius degrees), and the 32 accounts for the offset between the two scales at their zero points.
At what temperature are Celsius and Fahrenheit equal?
At -40 degrees, the Celsius and Fahrenheit scales are equal: -40°C = -40°F. This is the unique point of equilibrium between the two systems.
How do you convert C to F easily?
For a quick approximation, double the Celsius temperature and add 30. This method gives you a close estimate for everyday temperatures. Example: 20°C × 2 = 40, + 30 = 70°F (actual value is 68°F).
How do you calculate C for F?
To convert Fahrenheit to Celsius, use the exact formula: °C = (°F - 32) × 5/9. For example, to convert 100°F to Celsius: (100 - 32) × 5/9 = 37.8°C.