Celsius to Réaumur

1 Celsius equals 0.8 Réaumur on this page.

Direct Answer

1 Celsius equals 0.8 Réaumur

This conversion uses a scale-and-offset equation (°Ré = °C * 0.8).

For 20 Celsius, the converted value equals 16 Réaumur.

Converter Calculator

0.8 Réaumur (°Ré)

Switch

Explanation

Use this page when you want a direct Celsius to Réaumur conversion. On this page, 1 Celsius equals 0.8 Réaumur.

Historical temperature scales can differ by degree size, zero reference, or both, so this route uses the exact direction-specific equation °Ré = °C x 0.8 instead of one shared factor.

Celsius (deg C): a modern relative temperature scale widely used in science, weather, and everyday measurement.

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 = °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

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 /historical-temperature-scales/reaumur-to-celsius/, where the inverse equation is used so the mirror route stays numerically aligned.