Rankine to Celsius Converter
Convert temperatures between Rankine and Celsius instantly. Enter a value in either field for live two-way conversion.
Use the Rankine to Celsius Converter
Temperature Conversion
Result
Enter a value in either field to see the result.
Rankine
—
R
Celsius
—
°C
Common Reference Values
| Description | Rankine (R) | Celsius (°C) |
|---|---|---|
| Absolute zero | 0 | −273.15 |
| Fahrenheit zero | 459.67 | −17.7778 |
| Water freezing point | 491.67 | 0 |
| Room temperature (68 °F) | 528.67 | 20 |
| Water boiling point | 671.67 | 100 |
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Summary
Rankine (R) is an absolute temperature scale used mainly in US engineering. Celsius (C) is the metric standard. This tool converts in both directions using the exact thermodynamic formula.
How it works
- Enter a Rankine value in the top field — Celsius updates instantly.
- Enter a Celsius value in the bottom field — Rankine updates instantly.
- The formula Rankine → Celsius is: C = R × 5/9 − 273.15.
- The reverse formula Celsius → Rankine is: R = (C + 273.15) × 9/5.
- Results are rounded to four decimal places for precision.
Use cases
- Convert thermodynamic data from US engineering specs to metric.
- Verify temperature readings when working with Rankine-based equations.
- Cross-check absolute zero and steam-point reference values.
- Convert legacy HVAC or aerospace data reported in Rankine.
Frequently Asked Questions
Last updated: 2026-06-19 · Reviewed by Nham Vu