How to convert Celsius to Rankine
°R = (°C + 273.15) × 9/5
Apply the operations in the order shown. This formula converts a Celsius temperature reading to Rankine, not a temperature difference. The source reading must be at least -273.15 °C, the absolute-zero limit.
Worked examples
0 °C ≈ 491.67 °R
(0 + 273.15) × 9/5 ≈ 491.67
Water’s familiar freezing reference near standard atmospheric pressure.
100 °C ≈ 671.67 °R
(100 + 273.15) × 9/5 ≈ 671.67
Water’s familiar boiling reference near standard atmospheric pressure; actual boiling temperature changes with pressure.
Frequently asked questions
Can I use °C to °R for a temperature difference?
For an interval, use only the degree-size ratio and omit any offset. This calculator converts scale readings. Kelvin and Rankine start at absolute zero; Celsius and Fahrenheit have different zero points.