What Is a Celsius to Fahrenheit Converter?
A Celsius to Fahrenheit Converter converts temperatures measured in degrees Celsius (°C) into degrees Fahrenheit (°F). It is useful when comparing temperatures reported using different temperature scales.
Unlike simple length conversions, Celsius and Fahrenheit have different zero points and different degree sizes. This means both multiplication and addition are required.
Celsius to Fahrenheit Formula
°F = (°C × 9/5) + 32
Multiply the Celsius temperature by 9/5, which is the same as multiplying by 1.8. Then add 32 to get the Fahrenheit temperature.
°F = (°C × 1.8) + 32
How to Convert Celsius to Fahrenheit
Enter Celsius
Start with the temperature measured in degrees Celsius.
Multiply by 1.8
Multiply the Celsius temperature by 9/5 or 1.8.
Add 32
Add 32 to the result to calculate degrees Fahrenheit.
Celsius to Fahrenheit Conversion Example
Suppose you want to convert 25°C to Fahrenheit.
Example: Convert 25°C to Fahrenheit
Therefore, 25°C = 77°F.
Celsius to Fahrenheit Conversion Table
The following table shows common Celsius temperatures converted to Fahrenheit.
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40°C | -40°F |
| -20°C | -4°F |
| -10°C | 14°F |
| 0°C | 32°F |
| 5°C | 41°F |
| 10°C | 50°F |
| 15°C | 59°F |
| 20°C | 68°F |
| 25°C | 77°F |
| 30°C | 86°F |
| 35°C | 95°F |
| 37°C | 98.6°F |
| 40°C | 104°F |
| 100°C | 212°F |
What Is 0°C in Fahrenheit?
0°C equals exactly 32°F. This is the familiar freezing point of pure water under standard reference conditions.
0°C = 32°F
A useful reference point when comparing Celsius and Fahrenheit temperatures.
100°C = 212°F
The familiar boiling point of water at standard atmospheric pressure.
How to Convert Fahrenheit Back to Celsius
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit value and multiply the result by 5/9.
°C = (°F − 32) × 5/9
For example, subtracting 32 from 68°F gives 36. Multiplying 36 by 5/9 gives 20°C.
Celsius vs Fahrenheit
Both Celsius and Fahrenheit measure temperature, but they use different reference points and intervals.
Celsius
Celsius is widely used internationally for weather, everyday temperatures, education and scientific measurements.
Fahrenheit
Fahrenheit is commonly used for everyday temperatures in the United States and some related applications.
When Are Celsius and Fahrenheit Equal?
Celsius and Fahrenheit show the same numerical temperature at -40 degrees.
Same Temperature on Both Scales
This is the point where the numerical readings on both temperature scales are identical.
Useful Celsius to Fahrenheit Reference Points
| Celsius | Fahrenheit | Reference |
|---|---|---|
| -40°C | -40°F | Scales are equal |
| 0°C | 32°F | Water freezing reference |
| 10°C | 50°F | Cool temperature example |
| 20°C | 68°F | Mild temperature example |
| 25°C | 77°F | Warm temperature example |
| 30°C | 86°F | Hot temperature example |
| 100°C | 212°F | Water boiling reference* |
Where Is Celsius to Fahrenheit Conversion Useful?
- Comparing international weather forecasts.
- Converting cooking and oven temperatures.
- Understanding temperature specifications on products.
- School, science and educational calculations.
- Travel between countries using different temperature scales.
- HVAC and environmental temperature measurements.
- Comparing historical temperature records.
Do not simply multiply Celsius by a single conversion factor. Fahrenheit has a different zero point, so the 32-degree offset must also be included in the formula.
Common Celsius to Fahrenheit Conversion Mistakes
- Forgetting to add 32 after multiplying Celsius by 9/5.
- Using 5/9 instead of 9/5 when converting Celsius to Fahrenheit.
- Subtracting 32 instead of adding it.
- Confusing the Celsius-to-Fahrenheit formula with the reverse formula.
- Rounding intermediate values too early when high precision is needed.
Celsius to Fahrenheit Converter FAQs
Multiply the Celsius temperature by 9/5 and add 32. The formula is °F = (°C × 9/5) + 32.
0 degrees Celsius equals exactly 32 degrees Fahrenheit.
20 degrees Celsius equals exactly 68 degrees Fahrenheit.
25 degrees Celsius equals exactly 77 degrees Fahrenheit.
Celsius and Fahrenheit have the same numerical value at -40 degrees, so -40°C equals -40°F.
Subtract 32 from the Fahrenheit value and multiply the result by 5/9. The formula is °C = (°F − 32) × 5/9.