Quick reference
- −273.15 °C = 0 °R (absolute zero)
- 0 °C = 491.67 °R
- 25 °C = 536.67 °R
- 100 °C = 671.67 °R
Type a temperature in Celsius and the calculator returns Rankine using °R = (°C + 273.15) × 9/5. Rankine is the absolute counterpart to Fahrenheit, used in some US engineering fields.