Convert temperature, instantly.
Celsius, Fahrenheit and Kelvin, converted with the correct offset formulas rather than a flat ratio.
Temperature Converter
Temperature conversion benchmarks
🌡️ Temperature
| °F to °C | (°F − 32) × 5/9 |
| °C to °F | (°C × 9/5) + 32 |
| °C to K | °C + 273.15 |
| 0°C | 32°F / 273.15K |
How this conversion works
Temperature scales don't share a common zero point, so you can't convert between them by multiplying by a single factor the way you can with length or weight. Celsius is anchored to water's freezing point (0°) and boiling point (100°) at sea level; Fahrenheit uses 32° and 212° for the same two points; Kelvin starts at absolute zero, −273.15°C.
This converter applies the standard offset formulas shown in the table above, so a conversion like −40°C, which happens to equal exactly −40°F, comes out correctly rather than being approximated.
Frequently asked questions
Why is −40 the same in Celsius and Fahrenheit?
It's the one point where the two linear scales cross. Solving (°F − 32) × 5/9 = °F for °F gives exactly −40, so it's a genuine mathematical coincidence of where each scale put its zero and step size.
Is Kelvin ever negative?
No. Kelvin measures from absolute zero, the coldest physically possible temperature, so 0 K is its floor. That's equal to about −273.15°C or −459.67°F.