Conversion family

Temperature conversion calculators

Use temperature conversions for weather, cooking, science, and equipment settings.

These 12 guides cover the most commonly searched unit pairs. Each page includes the exact relationship, worked values, and a reverse-conversion path.

Celsius to Fahrenheit Converterc to f Celsius to Kelvin Converterc to k Celsius to Rankine Converterc to r Fahrenheit to Celsius Converterf to c Fahrenheit to Kelvin Converterf to k Fahrenheit to Rankine Converterf to r Kelvin to Celsius Converterk to c Kelvin to Fahrenheit Converterk to f Kelvin to Rankine Converterk to r Rankine to Celsius Converterr to c Rankine to Fahrenheit Converterr to f Rankine to Kelvin Converterr to k

How to use temperature conversions

Choose the guide whose source unit matches the value you already have and whose target unit matches the format you need. Enter the value without rounding it first, review the displayed relationship, and round only the final answer to the precision your task requires. Popular starting points in this family include Celsius to Fahrenheit, Celsius to Kelvin, Celsius to Rankine.

Temperature scales have different zero points as well as different interval sizes. Celsius, Fahrenheit, Kelvin, and Rankine conversions therefore require an offset in addition to multiplication, except for temperature differences where only the interval size matters. Unit symbols can be case-sensitive, and similarly named units may belong to different systems, so check the label as well as the abbreviation before relying on the result.

Keep the original value at full precision until the final step.
Confirm the unit symbol, system, and measurement type.
Use the reverse guide to check that the result returns to the starting value.

Measurement context

Confirm the measurement type before converting

Exact unit factors work best when the source and target units describe the same kind of measurement and the source convention is clear.

Check the unit symbol, full unit name, and measurement family before entering a value.
Keep the original number unrounded until the final result.
Use the reverse guide or a known reference value to sanity-check important results.