Temperature Converter

A Temperature Converter changes a temperature reading from one scale to another. It is useful because temperature scales do not all start at the same zero point, so the conversion is not just multiplication.

For example, Celsius to Fahrenheit uses both multiplication and an offset. Kelvin starts at absolute zero. Rankine is also absolute, but uses Fahrenheit-sized degrees. This makes a dedicated calculator safer than trying to treat temperature like length or weight.

Enter the temperature value, choose the source scale, then choose the target scale. The result updates automatically when the value or selected units change.

The current Temperature Converter code converts through Kelvin as the shared base scale. Each source unit is first converted to Kelvin, then Kelvin is converted to the target unit. This is important because temperature scales use offsets as well as ratios.

The result is formatted with seven significant digits. The swap control reverses the selected units and uses the current result as the new input. The copy control writes the visible result to your clipboard.

If you want to know normal body temperature in Fahrenheit, 37 C to F gives 98.6 F. If a hot day is listed as 100 F, Fahrenheit to Celsius gives about 37.7778 C. If a science problem gives 25 C, Celsius to Kelvin gives 298.15 K.

For freezing water, 0 C equals 32 F and 273.15 K. For boiling water at the common classroom reference point, 100 C equals 212 F and 373.15 K. Real boiling points can shift with pressure and altitude, so use classroom reference values with that context in mind.

These are the temperature conversions people search for most often. Use the calculator for your exact value, and use the table as a quick formula and reference check.

Temperature conversion is often about recognizing a real-world reference point. The table below keeps common situations tied to the scale people usually need.