Temperature Converter
Convert between Fahrenheit, Celsius, and Kelvin
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Temperature Converter Formula
Temperature conversions use dedicated formulas (not a simple multiplication factor). Celsius is the intermediary for indirect conversions:
C = (F - 32) × 5/9
To convert Celsius to Fahrenheit:
F = C × 9/5 + 32
To convert Celsius to Kelvin:
K = C + 273.15
How to Use This Calculator
- Enter the temperature value you want to convert in the Value field.
- Select the source unit in the From dropdown (Fahrenheit, Celsius, or Kelvin).
- Select the target unit in the To dropdown.
- Click Convert to see the converted temperature.
- Use the swap button between the dropdowns to quickly reverse the conversion direction.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value and multiply by 5/9. For example, 72°F = (72 - 32) × 5/9 = 22.2222°C. This calculator does the math for you instantly.
What is absolute zero?
Absolute zero is 0 Kelvin, equivalent to -273.15°C and -459.67°F. It is the lowest theoretically possible temperature, at which molecular motion stops.
At what temperature are Fahrenheit and Celsius equal?
Fahrenheit and Celsius are equal at -40 degrees. This is the only point where both scales intersect: -40°F = -40°C.
When should I use Kelvin instead of Celsius or Fahrenheit?
Kelvin is the SI unit for temperature and is used in scientific calculations, thermodynamics, and physics. Unlike Celsius and Fahrenheit, the Kelvin scale starts at absolute zero, making it ideal for equations where negative temperatures would cause errors. For other unit conversions, see our length converter or weight converter.
What is the boiling point of water in each scale?
Water boils at 100°C, 212°F, and 373.15 K at standard atmospheric pressure (1 atm). These are useful reference points for verifying temperature conversions.
Is this temperature converter free to use?
Yes, this temperature converter is completely free. It runs entirely in your browser, no sign-up or download required. Your data is never sent to any server.