About this tool
Convert Celsius, Fahrenheit and Kelvin with the correct offset formulas. The conversion runs instantly in your browser and displays a practical precision without sending entered values to a server.
How to use
- 1Enter the value you need to convert.
- 2Choose the source and destination units.
- 3Read the result or swap the units to reverse the conversion.
Benefits
- Uses documented standard conversion factors.
- Updates immediately as values change.
- Works locally without an upload.
Temperature scales use offsets as well as ratios
Practical example
20 °C equals 68 °F and 293.15 K. Doubling 20 °C does not mean doubling its physical temperature because Celsius and Fahrenheit do not begin at absolute zero.
Interpreting the result
Keep the scale symbol with every result. Use enough decimals for the task, but avoid implying measurement precision that the original thermometer did not provide.
Limits and common mistakes
The calculator converts numerical scales; it does not correct calibration, uncertainty, altitude effects or the difference between air, surface and body measurements.
Frequently asked questions
Why can the last decimals differ from another calculator?+
Displayed precision and rounding can vary, while the underlying standard factor remains the same.
Can I enter negative or decimal values?+
Yes. Negative values are meaningful for some measurements such as temperature; use context for other units.