Converting temperatures shouldn’t be a headache. Whether you are checking the weather for a trip, following a recipe from another country, or doing homework, our free Celsius to Fahrenheit tool gives you the answer instantly. There are no hidden fees, no sign-ups, and no limits on how many times you can use it. We built this tool to be 100% free because we believe simple tasks should stay simple. Just type in your number, and see the result immediately—no “Calculate” button needed!
Our tool uses the exact scientific formula to make sure your results are always accurate. Because different projects need different levels of detail, we added an “Options” box where you can choose how many decimal places you want to see. You can get a quick rounded number for a weather check or a very precise number for a science experiment. With our one-click copy button, you can grab your answer and get back to what you were doing in seconds. It’s fast, free, and works perfectly on phones and computers.
Helpful Tips
Double the Celsius and add 30. This is the fastest way to estimate the temperature in your head without needing a calculator.
Water turns to ice at exactly 0°C, which is 32°F. This is the most common reference point for weather.
A standard comfortable indoor temperature is 20°C (68°F). If the reading hits 25°C, it’s considered a warm day.
The two scales meet at -40. This means -40°C and -40°F are exactly the same temperature.
Common Conversions Table
| Celsius (°C) | Fahrenheit (°F) | Quick Note |
| -40°C | -40°F | Where Scales Meet |
| -18°C | 0°F | Very Cold Winter Day |
| 0°C | 32°F | Freezing Point of Water |
| 10°C | 50°F | Cool / Light Jacket |
| 20°C | 68°F | Perfect Room Temp |
| 25°C | 77°F | Warm Summer Day |
| 30°C | 86°F | Hot / Beach Weather |
| 37°C | 98.6°F | Normal Body Temp |
| 40°C | 104°F | Heatwave Warning |
| 100°C | 212°F | Boiling Point of Water |