Convert Reaumur to Rankine - Temperature Converter
This converter translates a single temperature value from degrees Réaumur (°Ré) to degrees Rankine (°R) using the mathematically exact relationships between the scales. It is intended for quick engineering, laboratory, educational, and documentation use.
If you require traceable measurements for calibration, compliance, or thermodynamic research, use this numeric conversion as a unit transformation only and follow calibration, uncertainty assessment, and reporting guidance from standards bodies such as NIST and ISO.
Governance
Record 311ad9778f97 • Reviewed by Fidamen Standards Committee
Interactive Converter
Convert between reaumur and rankine with precision rounding.
Quick reference table
| Reaumur | Rankine |
|---|---|
| 1 °Ré | 493.92 °R |
| 5 °Ré | 502.92 °R |
| 10 °Ré | 514.17 °R |
| 25 °Ré | 547.92 °R |
| 50 °Ré | 604.17 °R |
| 100 °Ré | 716.67 °R |
Methodology
The conversion is performed by chaining two exact relationships: Réaumur to Celsius, then Celsius to Rankine. Constants used are the defined offsets and scale factors for the International Temperature Scale (for practical conversions we use 0 °C = 273.15 K and the 9/5 ratio between Kelvin and Rankine).
Displayed results are computed with straightforward arithmetic rather than empirical approximations. For high-precision or regulatory work, include instrument uncertainty and calibration traceability to a recognized laboratory as described by NIST and ISO guidance.
Worked examples
Example 1: 0 °Ré → °R = 0 × 2.25 + 491.67 = 491.67 °R (freezing point of water).
Example 2: 80 °Ré → °R = 80 × 2.25 + 491.67 = 671.67 °R.
F.A.Q.
What is the exact formula to convert degrees Réaumur to degrees Rankine?
Use °R = (°Ré × 1.25 + 273.15) × 9/5, which simplifies to °R = °Ré × 2.25 + 491.67.
How many decimal places should I keep?
Choose precision based on use case: 2 decimal places are usually enough for general documentation, 3–6 significant figures for engineering calculations, and follow your lab's uncertainty and reporting rules for metrology. Always propagate instrument uncertainty when required.
Is this conversion suitable for thermodynamic calculations?
The numeric conversion is exact algebraically, but thermodynamic analysis often requires values tied to an international temperature scale and calibrated instruments. For high-precision work follow ITS-90 recommendations and calibration procedures from NIST/ISO.
Is the Réaumur scale still used?
The Réaumur scale is now rarely used and mainly of historical interest, though you may encounter it in older literature, recipes, or legacy engineering documents. Convert values to modern scales for calculation and reporting.
What should I consider when using sensor output?
Sensor readings have measurement uncertainty, drift, and calibration intervals. For compliance or safety-related use, ensure sensors are calibrated to a traceable standard, document uncertainty, and follow applicable safety guidance such as OSHA heat-exposure recommendations.
Sources & citations
- NIST — The International Temperature Scale of 1990 (ITS-90) and practical temperature measurement guidance — https://www.nist.gov/pml/weights-and-measures/thermodynamic-temperature-its-90
- ISO — Quantities and units; guidance for thermodynamic quantities and unit usage (ISO 80000 series) — https://www.iso.org/standard/35653.html
- IEEE Standards Association — standards and best practices for engineering measurements and units — https://standards.ieee.org/
- OSHA — workplace heat exposure guidance and safety recommendations — https://www.osha.gov/heat-exposure
- NIST SP 330 — The International System of Units (SI) — https://www.nist.gov/pml/special-publication-330
- BIPM SI Brochure (9th edition, 2019) — https://www.bipm.org/en/publications/si-brochure
Further resources
Related tools
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: 311ad9778f97What changed (latest)
v1.0.0 • 2025-11-21 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
What changed (latest)
v1.0.0 • 2025-11-21 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Public QA status
PASS — golden 25 + edge 120
Last run: 2026-01-23 • Run: golden-edge-2026-01-23
Engine
v1.0.0
Data
Baseline (no external datasets)
Content
v1.0.0
UI
v1.0.0
Governance
Last updated: Nov 21, 2025
Reviewed by: Fidamen Standards Committee (Review board)
Credentials: Internal QA
Risk level: low
Reviewer profile (entity)
Fidamen Standards Committee
Review board
Internal QA
Entity ID: https://fidamen.com/reviewers/fidamen-standards-committee#person
Semantic versioning
- MAJOR: Calculation outputs can change for the same inputs (formula, rounding policy, assumptions).
- MINOR: New features or fields that do not change existing outputs for the same inputs.
- PATCH: Bug fixes, copy edits, or accessibility changes that do not change intended outputs except for previously incorrect cases.
Review protocol
- Verify formulas and unit definitions against primary standards or datasets.
- Run golden-case regression suite and edge-case suite.
- Record reviewer sign-off with credentials and scope.
- Document assumptions, limitations, and jurisdiction applicability.
Assumptions & limitations
- Uses exact unit definitions from the Fidamen conversion library.
- Internal calculations use double precision; display rounding follows the unit's configured decimal places.
- Not a substitute for calibrated instruments in regulated contexts.
- Jurisdiction-specific rules may require official guidance.
Change log
v1.0.0 • 2025-11-21 • MINOR
Initial publication and governance baseline.
Why: Published with reviewed formulas, unit definitions, and UX controls.
Areas: engine, content, ui • Reviewer: Fidamen Standards Committee • Entry ID: 03949b0a6b15