Temperature Converter
6 conversions available
Convert between Celsius, Fahrenheit and Kelvin instantly.
Most popular temperature conversions
The most searched temperature conversions are Celsius to Fahrenheit and back, plus Celsius to Kelvin for science. 0°C is 32°F, 100°C is 212°F, and room temperature (20°C) is 68°F. A quick estimate: double the Celsius value and add 30 to approximate Fahrenheit.
Understanding temperature scales
Celsius is used worldwide for weather and cooking, Fahrenheit in the US, and Kelvin in science (starting at absolute zero, −273.15°C). Unlike other units, temperature scales don't share a zero point, so conversions involve both multiplication and addition.
Quick reference
0°C = 32°F = 273.15 K · 100°C = 212°F = 373.15 K · 37°C = 98.6°F (body temp) · 20°C = 68°F (room temp). Formula: °F = °C × 9/5 + 32.
Quick reference: temperature anchor points
| -40° | same in °C and °F |
| 0°C | 32°F — water freezes |
| 10°C | 50°F — cool day |
| 20°C | 68°F — room temperature |
| 30°C | 86°F — hot day |
| 37°C | 98.6°F — body temperature |
| 100°C | 212°F — water boils |
| 180°C | 356°F — common baking temp |
Frequently asked questions
What is the formula for Celsius to Fahrenheit?
Multiply by 9/5 and add 32. So 25°C = (25 × 1.8) + 32 = 77°F. For a rough estimate, double the Celsius and add 30.
At what temperature are Celsius and Fahrenheit equal?
At −40 degrees. It is the single point where both scales read the same number.
Why does science use Kelvin?
Kelvin starts at absolute zero (−273.15°C), the coldest possible temperature, so it never goes negative — which keeps physics equations clean. One kelvin step equals one Celsius degree.