Convert Celsius to Rankine - Temperature Converter
This converter transforms a temperature value given in degrees Celsius (°C) to degrees Rankine (°R), an absolute scale used primarily in some engineering fields. Rankine uses the same degree size as Fahrenheit but has its zero at absolute zero, so conversions require both an offset and a scale factor.
Use this tool for quick conversions, checks during calculations, and to prepare values for systems or documentation that specify Rankine. For compliance, safety limits, or measurements used in certification, pair conversions with calibrated instrumentation and report measurement uncertainty per referenced standards.
Governance
Record 0973631efaae • Reviewed by Fidamen Standards Committee
Interactive Converter
Convert between celsius and rankine with precision rounding.
Quick reference table
| Celsius | Rankine |
|---|---|
| 1 °C | 493.47 °R |
| 5 °C | 500.67 °R |
| 10 °C | 509.67 °R |
| 25 °C | 536.67 °R |
| 50 °C | 581.67 °R |
| 100 °C | 671.67 °R |
Methodology
Rankine is an absolute temperature scale related to Kelvin by a constant scale factor: 1 K = 1.8 °R. To convert from Celsius, first shift by the Kelvin offset (add 273.15) then convert the Kelvin value to Rankine by multiplying by 9/5.
This converter applies the fixed mathematical relationship between Celsius and Rankine. It does not attempt to correct for sensor error, calibration offsets, or measurement uncertainty; those must be handled at the instrument or procedural level following recognized standards.
For regulatory or safety applications, follow the measurement, calibration, and reporting guidance from standards bodies such as NIST, ISO and IEEE, and apply occupational guidelines (for example those from OSHA) when translating temperatures to action thresholds.
Key takeaways
Use °R = (°C + 273.15) × 9/5 for direct, exact mathematical conversion.
Round results to an appropriate number of significant digits for your application and document instrument calibration and uncertainty when values are used for compliance, safety decisions, or certification.
Worked examples
0 °C → (0 + 273.15) × 9/5 = 491.67 °R
25 °C → (25 + 273.15) × 9/5 = 536.67 °R
100 °C → (100 + 273.15) × 9/5 = 671.67 °R
-273.15 °C → (−273.15 + 273.15) × 9/5 = 0.00 °R (absolute zero)
F.A.Q.
What is Rankine and when is it used?
Rankine is an absolute temperature scale where zero equals absolute zero and one Rankine degree equals one Fahrenheit degree. It is commonly used in some engineering and thermodynamic contexts in the United States and legacy engineering documents.
Can I get negative Rankine values?
No. Because Rankine is an absolute scale anchored at absolute zero, valid physical temperatures expressed in Rankine are zero or positive. A Celsius input of −273.15 °C converts to 0 °R.
How many decimals should I report?
Report decimals according to the precision of the original measurement and the requirements of your application. For many engineering tasks two decimal places are sufficient, but regulated measurements should include an uncertainty statement following NIST/ISO guidance.
Does this conversion account for sensor calibration or uncertainty?
No. This tool performs a pure mathematical unit conversion. For traceable measurements, use calibrated instruments and follow calibration and uncertainty procedures defined by NIST, ISO, and relevant IEEE standards; record calibration certificates and uncertainty budgets as required.
Is Rankine the same as Kelvin?
No. Kelvin and Rankine are both absolute temperature scales, but they use different degree sizes. 1 K equals 1.8 °R. Convert between them by using the scale factor 9/5 (or 1.8).
Sources & citations
- NIST — Thermodynamic temperature and ITS-90 references — https://www.nist.gov/pml/weights-and-measures/temperature
- ISO — Quantities and units in the field of thermodynamics (reference standards catalog) — https://www.iso.org
- IEEE — Standards and recommended practices relevant to temperature measurement and sensors — https://standards.ieee.org
- OSHA — Heat exposure and workplace temperature guidance — https://www.osha.gov/heat-exposure
- ISO 80000-5:2019 — Thermodynamics — https://www.iso.org/standard/64976.html
- 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
Versioning & Change Control
Audit record (versions, QA runs, reviewer sign-off, and evidence).
Record ID: 0973631efaaeWhat changed (latest)
v1.0.0 • 2025-11-27 • 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 • 2025-11-27 • 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 27, 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 • 2025-11-27 • 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: 953a8d179ed6