Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin.
Converter guide
About Temperature Converter
The temperature converter changes readings among Celsius, Fahrenheit, and Kelvin. Unlike simple unit scales, Celsius and Fahrenheit have different zero points as well as different interval sizes, so conversion uses both a scale factor and an offset.
How to use this converter
- 1Enter the temperature value from the thermometer or reference.
- 2Select the source scale and the target scale. Confirm that a scientific value in Kelvin is not being treated as Celsius.
- 3Read the converted temperature and keep the original measurement precision in mind.
Conversion method and technical details
Celsius to Fahrenheit uses °F=(°C×9/5)+32. Celsius to Kelvin uses K=°C+273.15. Kelvin begins at absolute zero and is written without a degree symbol. The converter applies the correct offset and scale for the selected pair.
Worked real-world example
20°C equals 68°F and 293.15 K. The number differs on each scale, but each describes the same thermodynamic temperature.
Common scenarios and use cases
Translate weather reports, cooking references, lab measurements, and scientific values that use different temperature scales.
For a dependable comparison, confirm both unit labels, keep the original measurement with the converted value, and use the precision required by the task. The converter changes the representation of a value; it does not measure the item or decide which standard your project requires.
Important details and limitations
The conversion does not validate a thermometer or account for calibration uncertainty. Temperature is not the same as heat energy, and some calculations require absolute temperature in kelvin rather than a Celsius or Fahrenheit reading.
Check the output unit as well as the number. If the result will be reused in another calculation, retain full precision where possible and round only at the end. For measurements governed by a technical specification, use the standard and tolerance required by that document.
Frequently asked questions
Can Kelvin be negative?
Ordinary thermodynamic Kelvin temperatures cannot be below 0 K; check the input when converting unusual values.
Why is there a 32 in the Fahrenheit formula?
Celsius and Fahrenheit use different zero points, so conversion needs an offset as well as a scale ratio.
Should I use Celsius or Kelvin in a gas-law formula?
Many thermodynamic formulas require absolute temperature in kelvin; follow the equation's units.
Why can the converted number look much larger or smaller?
Different units use different scales. A measurement can have a larger number in a smaller unit and still describe the same quantity. Check the source and target unit labels before comparing values.
How many decimal places should I keep?
Keep enough precision for the job and avoid rounding values between steps. Round the final displayed answer to match the specification, document, or measuring tool you are using.