Rankine to Celsius Converter
Rankine (°R) → Celsius (°C)
Also: 77 °F Fahrenheit · 298.15 K Kelvin
Show Your Work
- 1. C = 536.67 × 5/9 − 273.15
- 2. C = 298.15 − 273.15
- 3. C = 25°C
About this conversion
Rankine is rarely the working scale outside U.S. thermodynamic engineering, so converting back to Celsius is the typical flow when sharing results with a metric audience. The formula C = R × 5/9 − 273.15 first scales Rankine-sized degrees down to Celsius size, then offsets by 273.15 to land on the Celsius zero.
Rankine to Celsius Reference Table
| Rankine (°R) | Celsius (°C) |
|---|---|
| 0 | -273.15 |
| 100 | -217.59444 |
| 200 | -162.03889 |
| 300 | -106.48333 |
| 400 | -50.927778 |
| 491.67 | 0 |
| 500 | 4.6277778 |
| 527.67 | 20 |
| 600 | 60.183333 |
| 671.67 | 100 |
| 700 | 115.73889 |
| 800 | 171.29444 |
| 900 | 226.85 |
| 1000 | 282.40556 |
| 1200 | 393.51667 |
| 1500 | 560.18333 |
| 2000 | 837.96111 |
| 2500 | 1115.7389 |
| 3000 | 1393.5167 |
When to use Rankine → Celsius
- Translating a U.S. thermodynamics result into Celsius for an international report
- Cross-checking a Rankine-based steam-table value against a metric reference
- Education contexts comparing the four temperature scales side by side
Worked Example
A steam-cycle calculation gives 536.67°R. What is that in Celsius?
- Start with the Rankine value: R = 536.67.
- Multiply by 5/9: 536.67 × 5/9 = 298.15 K.
- Subtract 273.15: 298.15 − 273.15 = 25.
- So 536.67°R = 25°C.
Frequently Asked Questions
What is the formula to convert Rankine to Celsius?
C = R × 5/9 − 273.15. First scale down to Kelvin-sized degrees (R × 5/9), then subtract 273.15 to land on the Celsius zero.
What is 491.67°R in Celsius?
491.67°R = 0°C. The freezing point of water expressed on both scales.
What is 0°R in Celsius?
0°R = -273.15°C. Absolute zero — the same temperature as 0 K.
More Temperature Conversions
- Celsius to Rankine — the reverse direction
- Rankine to Fahrenheit — same starting scale, different target
- Rankine to Kelvin — same starting scale, different target
- Fahrenheit to Celsius — different starting scale, same target
- Kelvin to Celsius — different starting scale, same target
- All-scale Temperature Converter — see Celsius, Fahrenheit, Kelvin, and Rankine at once
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