How do I convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5, then add 32. For example, 20 degrees Celsius equals 68 degrees Fahrenheit.
Temperature Converter
Free online temperature converter for Celsius (°C), Fahrenheit (°F), and Kelvin (K). Simple and reliable temperature conversions.
Last updated: September 2026
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°F = (°C × 1.8) + 32
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Common temperature units
Convert temperature units like Celsius, Fahrenheit, and Kelvin. Use OmniUnit for fast conversions between common units without leaving the page.
- Celsius (°C)
- Fahrenheit (°F)
- Kelvin (K)
How to use this temperature converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine. OmniUnit applies the full temperature formulas rather than a simple scale factor and rounds only the displayed result.
What to check
- Temperature conversions include an offset, so ordinary length-style multiplication is not enough.
- Kelvin is written without a degree symbol.
- Use sufficient precision for scientific work and round only the final reported value.
Quick answers
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9. For example, 68 degrees Fahrenheit equals 20 degrees Celsius.
How do I convert Celsius to Kelvin?
Add 273.15 to the Celsius value. Zero degrees Celsius equals 273.15 kelvins.
What is absolute zero?
Absolute zero is zero kelvins, equal to minus 273.15 degrees Celsius or minus 459.67 degrees Fahrenheit.