In 1 celsius there are 493.47 rankine. Meanwhile in 1 rankine there are -272.594444 celsius. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Rankine to Celsius calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert Celsius to Rankine, use a simple two-step rule: shift Celsius to an absolute scale, then match Rankine’s degree size.
Key concepts
Quick example
Use this conversion any time you need a clear Celsius to Rankine temperature conversion for science or engineering work.
To convert Celsius to Rankine, use this formula:
°R = (°C + 273.15) × 9/5
Add 273.15 to Celsius to get Kelvin, then scale by 9/5 to convert to Rankine.
This gives the temperature in °R.
Celsius (°C) is a metric scale where water freezes at 0°C and boils at 100°C (at standard pressure).
Rankine (°R) is an absolute temperature scale used in some engineering fields. It starts at absolute zero, like Kelvin, but uses Fahrenheit-sized degrees.
The 273.15 shift moves Celsius to an absolute scale.
Absolute temperature starts at absolute zero, where thermal motion is at its lowest point. Celsius sets 0°C at water’s freezing point, so it needs an offset to line up with absolute zero.
Using °R = (°C + 273.15) × 9/5:
0°C = (0 + 273.15) × 1.8 = 491.67°R
Rankine starts at absolute zero, so it never goes below 0°R.
In normal physics, no. Rankine is an absolute scale, so 0°R is the lowest value. Negative Rankine would imply temperatures below absolute zero, which isn’t used in standard temperature work.
Rankine and Kelvin are both absolute temperature scales. The difference is the size of the degree:
The link is:
°R = K × 9/5
K = °R × 5/9
Rankine uses the same degree size as Fahrenheit, but it starts at absolute zero.
°R = °F + 459.67
°F = °R - 459.67
This makes it easy to switch between Fahrenheit and Rankine.
100°C = (100 + 273.15) × 1.8 = 373.15 × 1.8 = 671.67°R
-40°C = (-40 + 273.15) × 1.8 = 233.15 × 1.8 = 419.67°R
25°C = (25 + 273.15) × 1.8 = 298.15 × 1.8 = 536.67°R
For a fast estimate:
This stays close for most everyday values. For exact work, use 273.15 and 9/5.
Rankine shows up most in thermal engineering and thermodynamics, mainly in work that also uses Fahrenheit units. It helps when you need an absolute temperature but want Fahrenheit-sized degrees.
No. For temperature differences, you don’t add 273.15. You only scale the size of the degree:
Δ°R = Δ°C × 9/5
Offsets matter only when converting an actual temperature value, not a change in temperature.
Common errors include:
The Calculate Box tool to convert celsius to rankine uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a celsius value in the box and have it instantly converted to rankine.