This converter changes degrees Celsius into degrees Rankine. Temperature is the one conversion people most often get wrong, because the two scales differ in both the size of a degree and where zero sits, so a single multiplication is not enough.
The everyday scale in most of the world, fixed at 0 °C for the freezing point of water and 100 °C for its boiling point at sea level. An absolute scale with Fahrenheit-sized degrees, used in some US thermodynamics and aerospace work.
The correct relationship is °R = °C × 1.8 + 491.67. Enter any value — including negative ones — and the result updates immediately, with the reverse conversion shown underneath as a check.
The formula
°C- Your temperature in degrees Celsius
0- The zero-point offset of the degrees Celsius scale
1.8- The ratio of degree sizes between the two scales
°R- The converted temperature in degrees Rankine
How it works, step by step
- Enter the temperature in degrees Celsius.
- The scale offset of 0 is removed first.
- The result is scaled by 1.8 to match the size of a degree Rankine.
- The degrees Rankine offset of 491.67 is added to land on the final value.
Worked examples
Room temperature (20 °C)
Applying °R = °C × 1.8 + 491.67 to 20 °C gives 527.67 °R. This is the value most thermostats sit near.
Body temperature (37 °C)
37 °C converts to 558.27 °R. Normal human body temperature is often quoted as this figure.
How to read your score
Frequently asked questions
What is the formula to convert degrees Celsius to degrees Rankine?
°R = °C × 1.8 + 491.67. Unlike most unit conversions this one is not a single multiplication, because the two scales have different zero points as well as different degree sizes.
What is 0 °C in degrees Rankine?
0 °C equals 491.67 °R.
What is 100 °C in degrees Rankine?
100 °C equals 671.67 °R.
Why can I not just multiply by a single factor?
Because both scales are offset from each other. A factor alone works only when both scales share a zero point, which is true for kelvin and Rankine but not for Celsius and Fahrenheit. Skipping the offset is the most common source of wrong answers.
Is there a temperature where degrees Celsius and degrees Rankine read the same?
Yes — the two scales cross at 614.59 °C.
What is a degree Celsius?
The everyday scale in most of the world, fixed at 0 °C for the freezing point of water and 100 °C for its boiling point at sea level.
What is a degree Rankine?
An absolute scale with Fahrenheit-sized degrees, used in some US thermodynamics and aerospace work.
Degrees Celsius to degrees Rankine reference table
| Degrees Celsius | Degrees Rankine |
|---|---|
| -40 °C | 419.67 °R |
| -20 °C | 455.67 °R |
| -10 °C | 473.67 °R |
| 0 °C | 491.67 °R |
| 10 °C | 509.67 °R |
| 20 °C | 527.67 °R |
| 25 °C | 536.67 °R |
| 30 °C | 545.67 °R |
| 37 °C | 558.27 °R |
| 50 °C | 581.67 °R |
| 75 °C | 626.67 °R |
| 100 °C | 671.67 °R |
| 200 °C | 851.67 °R |
Includes the reference points that matter: water freezing and boiling, body temperature, and room temperature.