Fahrenheit to Réaumur

1 Fahrenheit equals -13.777778 Réaumur on this page.

Direct Answer

1 Fahrenheit equals -13.777778 Réaumur

This conversion uses a scale-and-offset equation (°Ré = (°F - 32) / 2.25).

For 20 Fahrenheit, the converted value equals -5.333333 Réaumur.

Converter Calculator

-13.777778 Réaumur (°Ré)

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Explanation

Use this page when you want a direct Fahrenheit to Réaumur conversion. On this page, 1 Fahrenheit equals -13.777778 Réaumur.

Historical temperature scales can differ by degree size, zero reference, or both, so this route uses the exact direction-specific equation °Ré = (°F - 32) / 2.25 instead of one shared factor.

Fahrenheit (deg F): a temperature scale still used mainly in the United States for weather and household references.

Réaumur (deg Re): a historical temperature scale where water freezes at 0 deg Re and boils at 80 deg Re.

This route is useful when translating modern or absolute temperature references into historical Réaumur values for comparison with older scientific and industrial records.

This conversion uses an affine or exact linear historical-scale equation, so forward and reverse pages must keep their own dedicated formulas to stay numerically aligned.

Method & Reference

  • Method basis: exact affine formula (scale + offset) shown in Direct Answer.
  • Equation reference: °Ré = (°F - 32) / 2.25
  • Consistency rule: forward and reverse pages use inverse equations to preserve scale reference points.

Reference note

This Fahrenheit 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

Fahrenheit (°F)Réaumur (°Ré)
-40 -32
0 -14.222222
20 -5.333333
32 0
80 21.333333
100 30.222222

Frequently Asked Questions

What is 1 Fahrenheit in Réaumur?

1 Fahrenheit equals -13.777778 Réaumur on this page.

What equation does this Fahrenheit to Réaumur page use?

This page uses °Ré = (°F - 32) / 2.25, and the same equation drives the direct answer, calculator, table, and FAQ.

Is there a reverse page for Réaumur to Fahrenheit?

Yes. The reverse direction has its own page at /historical-temperature-scales/reaumur-to-fahrenheit/, where the inverse equation is used so the mirror route stays numerically aligned.