Réaumur to Celsius

1 Réaumur equals 1.25 Celsius on this page.

Direct Answer

1 Réaumur equals 1.25 Celsius

This conversion uses a scale-and-offset equation (°C = °Ré * 1.25).

For 20 Réaumur, the converted value equals 25 Celsius.

Converter Calculator

1.25 Celsius (°C)

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Explanation

Use this page when you want a direct Réaumur to Celsius conversion. On this page, 1 Réaumur equals 1.25 Celsius.

Historical temperature scales can differ by degree size, zero reference, or both, so this route uses the exact direction-specific equation °C = °Ré x 1.25 instead of one shared factor.

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

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

This route is useful when translating legacy Réaumur references into celsius values, or when comparing older scientific and industrial records with modern scales.

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: °C = °Ré * 1.25
Consistency rule: forward and reverse pages use inverse equations to preserve scale reference points.

Reference note

This Réaumur to Celsius 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

Réaumur (°Ré)	Celsius (°C)
-40	-50
0	0
20	25
32	40
80	100
100	125

Frequently Asked Questions

What is 1 Réaumur in Celsius?

1 Réaumur equals 1.25 Celsius on this page.

What equation does this Réaumur to Celsius page use?

This page uses °C = °Ré x 1.25, and the same equation drives the direct answer, calculator, table, and FAQ.

Is there a reverse page for Celsius to Réaumur?

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