Conversions

Verified calculator with a transparent formula

Conversions

Réaumur to Kelvin Calculator.

Converts a temperature from the Réaumur scale to Kelvin, the SI base unit of temperature.

Results update live as you type.
ƒ

Your inputs

How it works

  1. 1

    Enter the temperature in degrees Réaumur.

  2. 2

    Multiply the Réaumur value by 1.25 to convert to Celsius.

  3. 3

    Add 273.15 to the Celsius result to get Kelvin.

  4. 4

    The result is displayed in Kelvin.

reaumur * 1.25 + 273.15

Frequently asked questions

What is the Réaumur scale?

The Réaumur scale sets the freezing point of water at 0°Ré and the boiling point at 80°Ré. It was used in Europe in the 18th and 19th centuries.

How do I convert Kelvin to Réaumur?

Use the inverse formula: °Ré = (K - 273.15) / 1.25.

Why is the conversion factor 1.25?

Because 80°Ré equals 100°C, so 1°Ré = 100/80 = 1.25°C.

Explore this calculator category

ConversionsBrowse all

Results

Formula checked

Temperature in Kelvin

0K

Ask Anything

Estimate for general guidance only — verify important decisions with an appropriate professional.

How it works

Converts a temperature from the Réaumur scale to Kelvin, the SI base unit of temperature.

  1. Enter the temperature in degrees Réaumur.
  2. Multiply the Réaumur value by 1.25 to convert to Celsius.
  3. Add 273.15 to the Celsius result to get Kelvin.
  4. The result is displayed in Kelvin.

Formulas

The math behind this calculator, written out so you can verify the result.

Réaumur to Kelvin

K = °Ré × 1.25 + 273.15

First convert Réaumur to Celsius by multiplying by 1.25, then add 273.15 to get Kelvin.

Example:

Input: °Ré = 20

Calculation: 20 × 1.25 + 273.15 = 25 + 273.15

Result: 298.15 K

Real-world use cases

Where this calculation shows up in everyday life.

Historical temperature records

Convert old scientific data recorded in Réaumur to modern Kelvin units.

Example: A 19th-century lab notebook lists 30°Ré.

Education and science

Help students understand temperature scales and conversions.

Example: Teaching the relationship between Celsius and Réaumur.

Culinary heritage

Some traditional European recipes use Réaumur for oven temperatures.

Example: A recipe calls for 40°Ré.

Tips and common mistakes

Tips

  • Remember that 0°Ré is the freezing point of water, so 0°Ré = 273.15 K.
  • For quick mental estimates, multiply °Ré by 1.25 and add 273.
  • Use the calculator for negative values too; absolute zero is -218.52°Ré.

Common Mistakes to Avoid

  • Forgetting to add 273.15 after converting to Celsius.
  • Using 1.8 instead of 1.25 as the conversion factor (that's for Fahrenheit).
  • Confusing Réaumur with Rankine or other scales.

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.