Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Quick presets
K
Common Temperatures
| 说明 | °C | °F | K |
|---|---|---|---|
| Absolute Zero | -273.15 | -459.67 | 0 |
| Freezing Point | 0 | 32 | 273.15 |
| Room Temperature | 20 | 68 | 293.15 |
| Body Temperature | 37 | 98.6 | 310.15 |
| Boiling Point | 100 | 212 | 373.15 |
Click a row to load that temperature.
Conversion Formulas
- °F = °C × 9/5 + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
- °C = K − 273.15
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (or 1.8) and add 32. For example, 25°C × 1.8 + 32 = 77°F. A quick mental shortcut: double the Celsius value and add 30 for a rough estimate (25 × 2 + 30 = 80, close to the actual 77).
What is the Kelvin scale used for?
Kelvin is the SI unit of temperature used in science and engineering. It starts at absolute zero (0 K = –273.15°C), the lowest possible temperature. To convert Celsius to Kelvin, simply add 273.15. Water freezes at 273.15 K and boils at 373.15 K.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit are equal at −40°. This is the only temperature where both scales intersect: −40°C = −40°F. You can verify this with the formula: (−40 × 9/5) + 32 = −72 + 32 = −40.