Temperature Unit Converter

Enter a value and select a starting unit to see all available conversion results.

Temperature Units and Descriptions

Below are descriptions and historical context for each Temperature unit available in this converter.

Celsius (°C)

Developed by Anders Celsius in 1742. Originally inverted (0° = boiling, 100° = freezing), later reversed.

Fahrenheit (°F)

Created by Daniel Gabriel Fahrenheit in 1724. Based on brine freezing point (0°F) and human body temperature.

Kelvin (K)

Named after Lord Kelvin. Absolute temperature scale starting at absolute zero (-273.15°C).

Rankine (R)

Rankine scale, absolute temperature scale using Fahrenheit degrees. Named after William Rankine (1820-1872).

Base Unit Conversion Factors

The table below shows the conversion factors from each unit to the base unit, which is the Celsius (°C).

  • 1 Celsius (°C) = Celsius (°C)
  • 1 Celsius (°C) = (1 × 9/5) + 32 Fahrenheit (°F)
  • 1 Celsius (°C) = (1 + 273.15) Kelvin (K)
  • 1 Celsius (°C) = (1 × 9/5) + 491.67 Rankine (R)