Celsius to Fahrenheit Calculator
Use the standard formula: °F = (°C × 9/5) + 32
What is the Celsius to Fahrenheit formula?
The Celsius to Fahrenheit formula is: F = (C × 9/5) + 32. This converts any temperature measured in degrees Celsius to degrees Fahrenheit.
In plain language, you multiply the Celsius value by 1.8 (which is the same as 9/5), then add 32. That final number is the Fahrenheit temperature.
Step-by-step: how to calculate Celsius to Fahrenheit
- Start with your Celsius value.
- Multiply by 9.
- Divide by 5.
- Add 32.
Example 1: Convert 0°C
(0 × 9/5) + 32 = 32°F
Example 2: Convert 25°C
(25 × 9/5) + 32 = 45 + 32 = 77°F
Example 3: Convert -10°C
(-10 × 9/5) + 32 = -18 + 32 = 14°F
Why does the formula include +32?
Celsius and Fahrenheit scales start at different zero points. On the Fahrenheit scale, water freezes at 32°F, while on the Celsius scale it freezes at 0°C. The +32 shifts the temperature to match that offset.
The 9/5 part handles the size difference between the degree intervals on each scale.
Quick reference chart
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 | -40 |
| 0 | 32 |
| 10 | 50 |
| 20 | 68 |
| 30 | 86 |
| 37 | 98.6 |
| 100 | 212 |
Common mistakes to avoid
- Adding 32 before multiplying.
- Using 5/9 instead of 9/5 for Celsius to Fahrenheit conversions.
- Forgetting parentheses in a calculator app.
- Rounding too early in multi-step calculations.
Bonus: reverse formula (Fahrenheit to Celsius)
If you need to go the other way, use: C = (F - 32) × 5/9.
Keeping both formulas handy makes weather, cooking, science homework, and travel conversions much easier.
Final takeaway
If you remember just one line, remember this: F = (C × 9/5) + 32. Use the calculator above for instant results, or do it manually in four quick steps.