Temperature Converter (°C ↔ °F): A guide, formulas, and quick answers
This guide will help you quickly change between Celsius (°C) and Fahrenheit (°F). It’s helpful for cooking, checking the weather, doing science, or any other time you need to quickly and accurately change the temperature.
How to Use the Converter for Temperature
Fill in either the Celsius or Fahrenheit field with a number.
The other field updates on its own.
You can change the number of decimal places to get more accuracy.
Either copy the result or try a different value.
Tip: Cold weather and freezers also work, as do negative temperatures.
Formulas for Conversion
To change Celsius to Fahrenheit, use this formula: °F = (°C × 9/5) + 32
To change Fahrenheit to Celsius, use this formula: °C = (°F − 32) × 5/9
For more details, see Celsius to Fahrenheit formulas and Fahrenheit to Celsius formulas.
Examples that are common
Points for the Weather
0°C = 32°F (freezing)
10°C is about 50°F, which is cool.
20°C is about 68°F, which is mild.
25°C is about 77°F, which is warm.
30°C is about 86°F (hot).
Body temperature is about 98.6°F (37°C).
212°F (boiling) = 100°C
Some Examples from the Kitchen
212°F = 100°C
350°F = 176.7°C
400°F = 204.4°C
425°F = 218.3°C
Uses in HVAC and labs
-18°C is about 0°F (freezer)
-40 degrees Celsius is the same as -40 degrees Fahrenheit.
121°C is about 249.8°F (for sterilization)
Table for Quick Reference
| Celsius (°C) | Fahrenheit (°F) | Fahrenheit (°F) | Celsius (°C) |
|---|---|---|---|
| -40 | -40 | 32 | 0 |
| -18 | 0 | 68 | 20 |
| 10 | 50 | 77 | 25 |
| 25 | 77 | 86 | 30 |
| 37 | 98.6 | 100 | 37.8 |
| 100 | 212 | 212 | 100 |
The values are rounded. For exact accuracy, use a temperature calculator.
Questions and Answers
How can I quickly change Celsius to Fahrenheit?
Add 32 to the number after multiplying by 9 and dividing by 5.
Example: 25°C → (25×9/5)+32 = 77°F
How do I change Fahrenheit to Celsius?
Take away 32 and then multiply by 5/9.
For example, 98.6°F → (98.6−32)×5/9 ≈ 37°C
What is the same temperature in both °C and °F?
-40°
Are there common weather changes?
0°C = 32°F, 10°C ≈ 50°F, 20°C ≈ 68°F, and 30°C ≈ 86°F.
Is this right for scientific work?
Yes, formulas are correct. Use more decimal places for labs.
Can I put in temperatures that are below zero?
Yes, the converter can handle negative numbers.
For more accurate conversions, try our Celsius to Fahrenheit calculator.