What is the formula for Rankine to Celsius?

The formula is: °C = (°R − 491.67) × 5/9. For example, 528°R: (528 − 491.67) × 5/9 = 20.18°C.

What is 0°R in Celsius?

0°R equals −273.15°C, which is absolute zero. The Rankine scale, like kelvin, starts at absolute zero.

What is 491.67°R in Celsius?

491.67°R equals exactly 0°C - the freezing point of water. This number (491.67) is the Rankine offset for the Celsius zero point.

Rankine to Celsius (°R to °C) Converter

1 °R = -272.5944 °C

1 Rankine equals -272.5944 Celsius (1 °R = -272.5944 °C). Convert Rankine to Celsius with formula, table, and examples.

To convert Rankine to Celsius, subtract 491.67 and multiply by 5/9. This reverses the Celsius-to-Rankine conversion and is needed when interpreting American engineering data expressed in Rankine for use in metric contexts.

How to Convert Rankine to Celsius

°C = (°R × 5/9) − 273.15

Formula: Rankine to Celsius

Multiply Rankine by 5/9
Subtract 273.15
Read the result in Celsius

Common Rankine to Celsius Conversions

Rankine (°R)	Celsius (°C)	Status
0 °R	-273.15 °C
100 °R	-217.59 °C
200 °R	-162.04 °C
300 °R	-106.48 °C
400 °R	-50.93 °C
459 °R	-18.15 °C
491.67 °R	0 °C
500 °R	4.63 °C
530 °R	21.29 °C
559 °R	37.41 °C
600 °R	60.18 °C
671.67 °R	100 °C
700 °R	115.74 °C
800 °R	171.29 °C
1,000 °R	282.41 °C

Good to Know About Rankine to Celsius Conversion

Rankine temperatures appear almost exclusively in American thermodynamics textbooks and some legacy ASHRAE (heating/cooling) standards. European engineers will almost never encounter Rankine outside of US-authored publications.

Rankine to Celsius: What You Need to Know

A combustion temperature of 3,000°R equals about 1,393°C. Standard room temperature of 528°R is about 20°C. When reading older American engineering literature or HVAC specifications that use Rankine, converting to Celsius provides more intuitive understanding for metric-trained engineers.

What is a Rankine? °R

An absolute temperature scale using Fahrenheit-sized degrees. 0 °R equals absolute zero. Used in some US engineering applications, especially thermodynamics.

Imperial thermodynamics US engineering heat transfer

Learn more about Rankine →

What is a Celsius? °C

A metric temperature scale where 0°C is the freezing point and 100°C is the boiling point of water. Used worldwide except in the US.

Metric weather cooking science

Learn more about Celsius →

Going the other way? Use our Celsius to Rankine converter.

Rankine to Celsius FAQ

The formula is: °C = (°R − 491.67) × 5/9. For example, 528°R: (528 − 491.67) × 5/9 = 20.18°C.
0°R equals −273.15°C, which is absolute zero. The Rankine scale, like kelvin, starts at absolute zero.
491.67°R equals exactly 0°C - the freezing point of water. This number (491.67) is the Rankine offset for the Celsius zero point.

Non-Frequently Asked Questions About Rankine to Celsius

Questions nobody should ask - but someone did.

William John Macquorn Rankine was a Scottish engineer who thought Fahrenheit needed an absolute version. So he created Rankine: Fahrenheit plus 459.67. It is used mainly by American engineers who refuse to use Kelvin but need absolute temperatures. A very niche rebellion.