Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin with formula display.
How to Use the Temperature Converter
Instantly convert temperatures between Celsius, Fahrenheit and Kelvin with the formula displayed.
- Select the input scale — choose Celsius, Fahrenheit or Kelvin from the dropdown.
- Enter a temperature — type any number (positive or negative) into the input field.
- Read all three scales — the tool shows the equivalent temperature in all three units simultaneously.
- View the formula — the exact conversion formula used is displayed below the results.
- Copy any value — click on any result card to copy that value to your clipboard.
All calculations run in your browser. No data leaves your device.
Frequently Asked Questions
What is the formula for Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (or 1.8) and add 32. The formula is: °F = °C × 9/5 + 32. For example, 100°C × 9/5 + 32 = 212°F.
What is absolute zero?
Absolute zero is 0 Kelvin, which equals −273.15°C or −459.67°F. It is the theoretical lowest temperature, where all molecular motion stops.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit read the same value at −40 degrees. This is the only point where the two scales intersect: −40°C = −40°F.
When should I use Kelvin?
Kelvin is the SI base unit for temperature and is used in science, physics and engineering. Unlike Celsius and Fahrenheit, the Kelvin scale starts at absolute zero and has no negative values.
What is the boiling point of water in each scale?
Water boils at 100°C, 212°F, or 373.15 K at standard atmospheric pressure (1 atm or 101.325 kPa).
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