What is the formula to convert Reaumur to Celsius?

°C = °Ré × 1.25. Multiply the Reaumur value by five-fourths (1.25) to get the Celsius equivalent.

What is the Reaumur scale?

The Reaumur scale was proposed by René Antoine Ferchault de Réaumur in 1730. It sets the freezing point of water at 0 °Ré and the boiling point at 80 °Ré.

Is the Reaumur scale still used today?

Rarely. It was historically common in continental Europe, particularly in France, Germany, and Russia. It has been almost entirely replaced by Celsius and Fahrenheit.

What is 80 °Ré in Celsius?

80 °Ré equals 100 °C — the boiling point of water.

What is 0 °Ré in Celsius?

0 °Ré equals 0 °C — the freezing point of water is the same on both scales.

What is body temperature in Reaumur?

Normal body temperature is about 37 °C, which equals 29.6 °Ré. Enter 29.6 in the converter to verify.

Reaumur to Celsius Converter

Name: Reaumur to Celsius Converter
Availability: InStock
Author: Nham Vu

Enter a Reaumur value to get the Celsius equivalent instantly, with the formula and a common temperature reference table.

Temperature Converter

Reaumur (°Ré)

Celsius (°C)

Common Temperatures

Description	°Ré	°C

Summary

Enter a Reaumur value to get the Celsius equivalent instantly, with the formula and a common temperature reference table.

How it works

Type a Reaumur temperature into the input field.
The Celsius equivalent appears instantly below.
The formula panel shows the exact calculation.
Browse the reference table for common temperature benchmarks.
Click any row in the table to load that value into the converter.

Use cases

Interpret historical scientific documents that used the Reaumur scale.
Convert temperatures found in older European recipes or dairy texts.
Study the relationship between the 80-degree Reaumur scale and Celsius.
Compare multiple temperature scales side by side for education.
Cross-check cheese-making or fermentation temperatures from old manuals.

Frequently Asked Questions

Last updated: 2026-07-24 · Reviewed by Nham Vu