Historical Temperature ScalesCelsius to Reaumur

Celsius to Réaumur

Methodology·How We Verify

Snapshot

1 Celsius equals 0.8 Réaumur.

Reference basis: This conversion uses a scale-and-offset equation (°Ré = °C * 0.8).
Example: For 20 Celsius, the converted value equals 16 Réaumur.

Interactive conversion

Converter Calculator

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

0.8 Réaumur (°Ré)

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API and AI agent access

Celsius to Réaumur.

Machine-readable identifiers

Conversion family: historical-temperature-scales
Source unit: celsius
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": "celsius",
  "to": "reaumur"
}

Essential response

{
  "ok": true,
  "conversion": {
    "family": "historical-temperature-scales",
    "value": 1,
    "from": "celsius",
    "to": "reaumur",
    "result": {
      "raw": 0.8,
      "display": "0.8"
    },
    "canonicalPath": "/historical-temperature-scales/celsius-to-reaumur/"
  }
}

API, OpenAPI and WebMCP documentation

Explanation

Use the exact affine transform for Celsius to Réaumur: multiply Celsius by 0.8.

Method & Reference

Method basis: exact affine formula (scale + offset) shown in Snapshot.
Equation reference: °Ré = °C * 0.8
Consistency rule: forward and reverse pages use inverse equations to preserve scale reference points.

Reference note

This Celsius 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

Celsius (°C)	Réaumur (°Ré)
-40	-32
0	0
20	16
32	25.6
80	64
100	80

Questions & answers

Frequently Asked Questions

What is 1 Celsius in Réaumur?

1 Celsius equals 0.8 Réaumur on this page.

What equation does this Celsius to Réaumur page use?

This page uses °Ré = °C x 0.8, and the same equation drives the direct answer, calculator, table, and FAQ.

Is there a reverse page for Réaumur to Celsius?

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