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

Full °R to °C table: 0°R to 2000°R (44 values)

Rankine (°R)	Celsius (°C)
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
450°R	-23.15°C
460°R	-17.59°C
470°R	-12.04°C
480°R	-6.48°C
490°R	-0.93°C
500°R	4.63°C
510°R	10.18°C
520°R	15.74°C
530°R	21.29°C
540°R	26.85°C
550°R	32.41°C
560°R	37.96°C
570°R	43.52°C
580°R	49.07°C
590°R	54.63°C
600°R	60.18°C
610°R	65.74°C
620°R	71.29°C
630°R	76.85°C
640°R	82.41°C
650°R	87.96°C
660°R	93.52°C
670°R	99.07°C
680°R	104.63°C
690°R	110.18°C
700°R	115.74°C
800°R	171.29°C
900°R	226.85°C
1000°R	282.41°C
1100°R	337.96°C
1200°R	393.52°C
1300°R	449.07°C
1400°R	504.63°C
1500°R	560.18°C
1600°R	615.74°C
1700°R	671.29°C
1800°R	726.85°C
1900°R	782.41°C
2000°R	837.96°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.