Celsius to Rankine Converter
Celsius (°C) → Rankine (°R)
Also: 77 °F Fahrenheit · 298.15 K Kelvin
Show Your Work
- 1. R = (25 + 273.15) × 9/5
- 2. R = 298.15 × 9/5
- 3. R = 536.67°R
About this conversion
Rankine is the absolute-temperature partner of Fahrenheit, used primarily in U.S. thermodynamic engineering (steam cycles, refrigeration, combustion analysis). Converting Celsius to Rankine is a two-step operation: shift to absolute (add 273.15) then scale Celsius-sized degrees up to Fahrenheit/Rankine size (× 9/5).
Celsius to Rankine Reference Table
| Celsius (°C) | Rankine (°R) |
|---|---|
| -273.15 | 0 |
| -200 | 131.67 |
| -100 | 311.67 |
| -50 | 401.67 |
| 0 | 491.67 |
| 20 | 527.67 |
| 25 | 536.67 |
| 50 | 581.67 |
| 100 | 671.67 |
| 150 | 761.67 |
| 200 | 851.67 |
| 250 | 941.67 |
| 300 | 1031.67 |
| 400 | 1211.67 |
| 500 | 1391.67 |
| 750 | 1841.67 |
| 1000 | 2291.67 |
When to use Celsius → Rankine
- U.S. thermodynamic textbooks where the engineering convention uses Rankine despite the source data being in Celsius
- Steam-cycle, gas-turbine, or refrigeration analysis where pressures are in psi and temperatures need to match the unit system
- Cross-checking values when a U.S. engineering reference and a metric textbook describe the same process
Worked Example
A thermodynamic process runs at 25°C. Convert to Rankine.
- Start with the Celsius value: C = 25.
- Add 273.15 to get Kelvin: 25 + 273.15 = 298.15 K.
- Multiply by 9/5 to convert to Rankine: 298.15 × 9/5 = 536.67.
- So 25°C = 536.67°R.
Rankine is mostly an engineering convenience — the absolute scale on Fahrenheit-sized degrees. The two-step path makes the relationship to both Celsius and Fahrenheit clear.
Frequently Asked Questions
What is the formula to convert Celsius to Rankine?
R = (C + 273.15) × 9/5. First add 273.15 to convert to Kelvin, then multiply by 9/5 to scale up to Rankine-sized degrees.
What is 0°C in Rankine?
0°C = 491.67°R. The freezing point of water expressed on the absolute Fahrenheit scale.
What is 100°C in Rankine?
100°C = 671.67°R. The boiling point of water expressed in Rankine.
When is Rankine actually used?
Almost exclusively in U.S. thermodynamic engineering — steam cycles, refrigeration, and combustion analysis where the rest of the unit system (psi, BTU, ft) is U.S. customary and absolute temperatures are required for ideal-gas and entropy calculations.
More Temperature Conversions
- Rankine to Celsius — the reverse direction
- Celsius to Fahrenheit — same starting scale, different target
- Celsius to Kelvin — same starting scale, different target
- Fahrenheit to Rankine — different starting scale, same target
- Kelvin to Rankine — different starting scale, same target
- All-scale Temperature Converter — see Celsius, Fahrenheit, Kelvin, and Rankine at once
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