Rankine to Celsius Converter

Rankine (°R) is an absolute temperature scale that uses Fahrenheit-sized degrees but starts at absolute zero, similar to Kelvin. One degree Rankine equals one degree Fahrenheit, with 0°R being absolute zero.

The Rankine scale was developed by Scottish engineer and physicist William John Macquorn Rankine in 1859. It was created to provide an absolute temperature scale for engineering applications in countries using the Fahrenheit system, combining the familiar Fahrenheit degree size with the scientific concept of absolute zero.

Rankine is primarily used in engineering applications in the United States, particularly in thermodynamics, heat transfer calculations, and steam power systems. It's used in some specialized engineering software and textbooks, though Kelvin is increasingly preferred even in American scientific and engineering contexts.

Celsius (°C) is a temperature scale where 0°C is the freezing point of water and 100°C is the boiling point of water at standard atmospheric pressure. It is part of the metric system and widely used worldwide.

The Celsius scale was developed by Swedish astronomer Anders Celsius in 1742. Originally, he defined 0° as the boiling point and 100° as the freezing point of water, but this was later reversed. The scale was officially renamed from 'centigrade' to 'Celsius' in 1948 to honor its creator.

Celsius is the standard temperature scale used in most countries worldwide for weather reporting, cooking, medical applications, and scientific work. It's the official temperature scale in the International System of Units (SI) and is used in virtually all countries except the United States for everyday temperature measurements.