What is the Rankine scale?

Rankine is an absolute temperature scale where 0 R is absolute zero. It uses Fahrenheit-sized degrees, so 1 R = 1 °F in increment. It is used in some US engineering fields such as thermodynamics and aerospace.

What is the Reaumur scale?

Reaumur (Re) is a historical temperature scale proposed by Rene Antoine Ferchault de Reaumur in 1730. Water freezes at 0 Re and boils at 80 Re. It was widely used in Europe before Celsius became the standard.

What is the formula to convert Rankine to Reaumur?

Re = (R − 491.67) × 4/9. Subtract 491.67 (the Rankine equivalent of the water freezing point) then multiply by 4/9 to scale to the 80-degree Reaumur boiling range.

What is 0 Rankine in Reaumur?

0 R = −218.52 Re, which corresponds to absolute zero — the lowest possible temperature.

What is 491.67 Rankine in Reaumur?

491.67 R = 0 Re, the freezing point of water on both the Reaumur and Rankine reference anchors.

What is 671.67 Rankine in Reaumur?

671.67 R = 80 Re, the boiling point of water at sea level — the upper fixed point of the Reaumur scale.

Rankine to Reaumur Converter

Name: Rankine to Reaumur Converter
Availability: InStock
Author: Nham Vu

Convert temperatures between Rankine and Reaumur instantly. Enter a value in either field for live two-way conversion.

Temperature Conversion

Rankine (R)

Reaumur (°Re)

Result

Enter a value in either field to see the result.

Common Reference Values

Description	Rankine (R)	Reaumur (°Re)
Absolute zero	0	−218.52
Fahrenheit zero	459.67	−14.2222
Water freezing point	491.67	0
Room temperature (68 °F)	527.67	16
Water boiling point	671.67	80

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Summary

Convert temperatures between Rankine and Reaumur instantly. Enter a value in either field for live two-way conversion.

How it works

Enter a Rankine value in the top field — Reaumur updates instantly.
Enter a Reaumur value in the bottom field — Rankine updates instantly.
The formula Rankine → Reaumur is: Re = (R − 491.67) × 4/9.
The reverse formula Reaumur → Rankine is: R = Re × 9/4 + 491.67.
Results are rounded to four decimal places for precision.

Use cases

Convert thermodynamic data between Rankine-based US engineering specs and historical Reaumur records.
Verify temperature readings when working with older European scientific literature.
Cross-check absolute zero and steam-point reference values across scales.
Convert legacy temperature data reported in either Rankine or Reaumur.

Frequently Asked Questions

Last updated: 2026-07-24 · Reviewed by Nham Vu