Rankine to Celsius Converter (°R to °C)

How to convert Rankine to Celsius

°C = (°R − 491.67) × 5/9

To convert Rankine to Celsius, subtract 491.67 (the Rankine reading of water's freezing point) and multiply by 5/9 to switch from Fahrenheit-sized degrees to Celsius-sized ones. Because Rankine is an absolute scale, 0 °R means absolute zero: -273.15°C.

Worked examples

Convert 491.67 °R: (491.67 − 491.67) × 5/9 = 0°C (water freezes)
Convert 671.67 °R: (671.67 − 491.67) × 5/9 = 100°C (water boils)
Convert 0 °R: (0 − 491.67) × 5/9 = -273.15°C (absolute zero)

Rankine to Celsius conversion table (°R to °C)

Rankine (°R)	Celsius (°C)
0°R	-273.15°C
50°R	-245.37°C
100°R	-217.59°C
150°R	-189.82°C
200°R	-162.04°C
250°R	-134.26°C
300°R	-106.48°C
350°R	-78.71°C
400°R	-50.93°C
450°R	-23.15°C
500°R	4.63°C
550°R	32.41°C
600°R	60.18°C
650°R	87.96°C
700°R	115.74°C
750°R	143.52°C
800°R	171.29°C
850°R	199.07°C
900°R	226.85°C
950°R	254.63°C
1000°R	282.41°C

Reference temperatures in °R and °C

Reference point	°R	°C
Absolute zero	0°R	-273.15°C
Arctic winter day	437.67°R	-30°C
Home freezer	459.27°R	-18°C
Water freezes / ice melts	491.67°R	0°C
Refrigerator	497.07°R	3°C
Cool spring day	509.67°R	10°C
Comfortable room	529.47°R	21°C
Summer afternoon	545.67°R	30°C
Normal body temperature	558.27°R	37°C
Hot bath	563.67°R	40°C
Death Valley record heat	593.73°R	56.7°C
Water boils (sea level)	671.67°R	100°C
Moderate oven	815.67°R	180°C

Frequently asked questions

What is 530 Rankine in Celsius?

530 °R equals 21.3°C - comfortable room temperature.

How do Rankine and Kelvin relate?

Both start at absolute zero; a Rankine degree is 5/9 the size of a kelvin, so °R = K × 1.8.