Temperature Converter
Enter one temperature and instantly see the matching values in the other common temperature scales.
Browse conversion tools
This page uses HandyCalcHub's shared conversion engine. Visit the Converters hub to see current and future converter categories.
What this converter does
The Temperature Converter changes one entered temperature into the other common scales. It supports Celsius, Fahrenheit, and Kelvin, and it rejects values below absolute zero so the results stay physically meaningful.
How temperature conversion works
Temperature conversion uses both scaling and offsets. Celsius and Fahrenheit do not share the same zero point, so Fahrenheit converts to Celsius with (°F - 32) × 5/9, while Celsius converts to Fahrenheit with (°C × 9/5) + 32.
Kelvin uses the same interval size as Celsius, but starts at absolute zero: K = °C + 273.15. This converter uses Celsius as the shared internal base and then converts into the requested target scales.
Worked example
If you enter 72 °F, the converter subtracts 32, multiplies by 5/9, and gets 22.2222222222 °C. It then adds 273.15 to show 295.3722222222 K.
Common reference temperatures
| Reference | Temperature |
|---|---|
| Water freezes | 0 °C / 32 °F / 273.15 K |
| Typical room temperature | about 20-22 °C / 68-72 °F |
| Water boils at standard atmospheric pressure | 100 °C / 212 °F / 373.15 K |
| Absolute zero | -273.15 °C / -459.67 °F / 0 K |
Water's boiling point changes with atmospheric pressure, so 100 °C / 212 °F refers to standard atmospheric pressure.
When temperature conversions are useful
Temperature conversions are useful for weather reports, cooking temperatures, room comfort, science assignments, product specifications, travel, and comparing settings or measurements from countries that use different scales.
Frequently asked questions
How do you convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply the result by 5/9.
How do you convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5, then add 32.
Can Kelvin be negative?
No. Kelvin values below 0 are below absolute zero and are not physically meaningful.
What is absolute zero?
Absolute zero is 0 K, which equals -273.15 °C and -459.67 °F.