Temperature Converter
Convert Celsius, Fahrenheit and Kelvin. Processing for supported tools happens locally in your browser.
About Temperature Converter
Use this browser-based utility for everyday tasks. Review output before relying on it and retain a copy of important originals.
Read the Temperature Converter guide →About Temperature Converter
Temperature scales have different zero points, so conversion uses both a scale factor and an offset. This tool converts a value between Celsius, Fahrenheit, and Kelvin.
How to use Temperature Converter
- Enter the temperature value.
- Choose its current scale.
- Choose the scale you want.
- Click Convert to display the converted value.
- Use Swap units to reverse the direction.
Rounding and precision
The displayed value is rounded. For cooking and weather this is more than enough, but for laboratory work, industrial settings or safety-critical equipment you should use the precision the standard requires and check your thermometer or sensor, because the converter does not know how accurate your instrument is.
Frequently asked questions
What is the formula to convert Celsius to Fahrenheit?
Fahrenheit = Celsius x 9/5 + 32. For example 25 C is 77 F. To convert back, Celsius = (Fahrenheit - 32) x 5/9.
At what temperature are Celsius and Fahrenheit equal?
At -40. Minus 40 C and minus 40 F are the same temperature.
Why can I not convert with one multiplier?
The zero points of the scales are different, so you must multiply and also add or subtract an offset.
Can a temperature in Kelvin be negative?
No. Kelvin starts at absolute zero, 0 K, which is -273.15 C.
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Want more detail, examples and answers to common questions? Read the Temperature Converter guide.