Rankine to Réaumur Converter
Convert Rankine (°R) to Réaumur (°Ré) instantly. Formula: °Ré = (°R - 491.67) × 4/9.
Temperature Converter
5 units available
1 °R = -218.075556 °Ré
Formula:
°Ré = (°R - 491.67) × 4/9With your value: 1 °R = -218.07555556 °Ré
Other Rankine to Réaumur conversions
Rankine to Réaumur Conversion Table
| Rankine (°R) | Réaumur (°Ré) |
|---|---|
| 0.5 | -218.297778 |
| 1 | -218.075556 |
| 2 | -217.631111 |
| 5 | -216.297778 |
| 10 | -214.075556 |
| 15 | -211.853333 |
| 20 | -209.631111 |
| 25 | -207.408889 |
| 50 | -196.297778 |
| 100 | -174.075556 |
| 250 | -107.408889 |
| 500 | 3.702222 |
| 1000 | 225.924444 |
Réaumur to Rankine Conversion Table
| Réaumur (°Ré) | Rankine (°R) |
|---|---|
| 0.5 | 492.795 |
| 1 | 493.92 |
| 2 | 496.17 |
| 5 | 502.92 |
| 10 | 514.17 |
| 15 | 525.42 |
| 20 | 536.67 |
| 25 | 547.92 |
| 50 | 604.17 |
| 100 | 716.67 |
| 250 | 1,054.17 |
| 500 | 1,616.67 |
| 1000 | 2,741.67 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Rankine (°R)
Temperature
Traceable to the kelvin, defined by fixing the Boltzmann constant at 1.380 649 × 10⁻²³ J/K. Celsius and Fahrenheit are exact affine transforms of the kelvin scale.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Réaumur (°Ré)
Temperature
Traceable to the kelvin, defined by fixing the Boltzmann constant at 1.380 649 × 10⁻²³ J/K. Celsius and Fahrenheit are exact affine transforms of the kelvin scale.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Rankine to Réaumur
This conversion uses an offset formula, so it cannot be described by a single multiplication factor.
Formula: °Ré = (°R - 491.67) × 4/9
Reverse: °R = ((°Ré × 5/4) + 273.15) × 9/5
Step-by-Step Example
- Start with your value in Rankine. For example: 5 °R
- Apply °Ré = (°R - 491.67) × 4/9
- The result is: -216.297778 °Ré
About Rankine
The Rankine scale is an absolute temperature scale using Fahrenheit-sized degrees: 0 °R is absolute zero and water freezes at 491.67 °R.
Common uses: US thermodynamics, combustion engineering.
About Réaumur
The Réaumur scale sets water's freezing point at 0 °Ré and its boiling point at 80 °Ré. It survives in a few European cheese and syrup recipes.
Common uses: historic recipes, history of science.
Frequently Asked Questions
How many Réaumur are in 1 Rankine?
There are exactly -218.0755555556 Réaumur in 1 Rankine.
What is the formula to convert Rankine to Réaumur?
The formula to convert Rankine to Réaumur is: °Ré = (°R - 491.67) × 4/9. For example, to convert 10 Rankine to Réaumur, you would apply the formula to 10.
What is a Rankine?
The Rankine scale is an absolute temperature scale using Fahrenheit-sized degrees: 0 °R is absolute zero and water freezes at 491.67 °R.
What is a Réaumur?
The Réaumur scale sets water's freezing point at 0 °Ré and its boiling point at 80 °Ré. It survives in a few European cheese and syrup recipes.
What are the common uses of Rankine?
The Rankine is commonly used in US thermodynamics, combustion engineering.
Related Temperature Conversions
Cite this page
UnitConvertLab. (2026). Rankine to Réaumur converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/rankine-to-reaumur