Historical Temperature ScalesKelvin to Reaumur

Kelvin to Réaumur

Methodology·How We Verify

Snapshot

1 Kelvin equals -217.72 Réaumur.

Reference basis: This conversion uses a scale-and-offset equation (°Ré = (K - 273.15) / 1.25).
Example: For 20 Kelvin, the converted value equals -202.52 Réaumur.

Interactive conversion

Converter Calculator

Decimals: 1.5 or 1,5. Fractions: 1/2. Scientific notation: 1e3. Write 1000 without grouping separators.

-217.72 Réaumur (°Ré)

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API and AI agent access

Kelvin to Réaumur.

Machine-readable identifiers

Conversion family: historical-temperature-scales
Source unit: kelvin
Target unit: reaumur

Use these identifiers in the API request. Sources and model limits also apply to software clients.

Example API request and response

POST /api/v1/convert

Request

{
  "family": "historical-temperature-scales",
  "value": 1,
  "from": "kelvin",
  "to": "reaumur"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "historical-temperature-scales",
    "value": 1,
    "from": "kelvin",
    "to": "reaumur",
    "result": {
      "raw": -217.71999999999997,
      "display": "-217.72"
    },
    "canonicalPath": "/historical-temperature-scales/kelvin-to-reaumur/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Use the exact affine transform: subtract 273.15 from Kelvin, then divide by 1.25.

Method & Reference

Method basis: exact affine formula (scale + offset) shown in Snapshot.
Equation reference: °Ré = (K - 273.15) / 1.25
Consistency rule: forward and reverse pages use inverse equations to preserve scale reference points.

Reference note

This Kelvin to Réaumur page uses explicit historical scale equations (scale + offset), not a simple multiplier.

Historical temperature scales are reconstructed from standard reference definitions.
Forward and reverse directions use inverse formulas, so each direction has its own dedicated page.

Common Conversion Values

Kelvin (K)	Réaumur (°Ré)
-40	—
0	-218.52
20	-202.52
32	-192.92
80	-154.52
100	-138.52

Questions & answers

Frequently Asked Questions

What is 1 Kelvin in Réaumur?

1 Kelvin equals -217.72 Réaumur on this page.

What equation does this Kelvin to Réaumur page use?

This page uses °Ré = (K - 273.15) / 1.25, and the same equation drives the direct answer, calculator, table, and FAQ.

Is there a reverse page for Réaumur to Kelvin?

Yes. The reverse direction has its own page at °Ré to K, where the inverse equation is used so the mirror route stays numerically aligned.