About this tool
This converter uses the standard formula: °F = (°C × 9/5) + 32. Type a value into either field and the other updates instantly — nothing is sent to a server.
Quick reference table
| Celsius | Fahrenheit |
|---|---|
| 0°C (freezing) | 32°F |
| 10°C | 50°F |
| 20°C (room temp) | 68°F |
| 37°C (body temp) | 98.6°F |
| 30°C | 86°F |
| 100°C (boiling) | 212°F |
Common use cases
- Checking a weather forecast reported in the unit you're not used to
- Converting an oven or cooking temperature between recipe conventions
- Converting a body temperature or scientific measurement between scales
Things to watch out for
Celsius and Fahrenheit have different zero points and step sizes, so the relationship isn't a simple multiplication — always use the full formula (×9/5, then +32) rather than a rough estimate, especially for temperatures far from the 0-100°C range where quick mental shortcuts break down. At exactly -40 degrees, both scales read the same number — a useful sanity check if you want to verify a conversion by hand.
Frequently asked questions
Multiply the Celsius temperature by 9/5, then add 32. For example, 20°C × 9/5 = 36, plus 32 = 68°F.
Those are water's freezing and boiling points at sea level. Celsius was designed around 0 and 100 for those two reference points, while Fahrenheit's scale places the same two points at 32 and 212 — both scales describe the same physical temperatures, just with different zero points and step sizes.
Yes — at -40 degrees, both scales read the same number: -40°C equals -40°F. It's the one point where the two scales intersect.