This calculator is currently shown in English while its translation is being prepared.

Conversions

Verified calculator with a transparent formula

Conversions

Fahrenheit to Rømer Converter.

Converts a temperature from degrees Fahrenheit to degrees Rømer, a historical temperature scale.

Results update live as you type.
ƒ

Your inputs

How it works

  1. 1

    Subtract 32 from the Fahrenheit value.

  2. 2

    Multiply the result by 7.

  3. 3

    Divide by 24.

  4. 4

    Add 7.5 to get the temperature in Rømer.

(fahrenheit - 32) * 7 / 24 + 7.5

Frequently asked questions

What is the Rømer scale?

The Rømer scale is an obsolete temperature scale proposed by Danish astronomer Ole Rømer in 1701. It sets the freezing point of brine at 0°Rø and the boiling point of water at 60°Rø.

How do I convert Rømer back to Fahrenheit?

Use the inverse formula: °F = (24/7) × (°Rø − 7.5) + 32.

Why is the conversion formula so complex?

The Rømer scale uses a different interval and zero point than Fahrenheit, so the conversion involves both scaling and shifting.

Explore this calculator category

ConversionsBrowse all

Results

Formula checked

Temperature in Rømer

18°Rø

Ask Anything

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

How it works

Converts a temperature from degrees Fahrenheit to degrees Rømer, a historical temperature scale.

  1. Subtract 32 from the Fahrenheit value.
  2. Multiply the result by 7.
  3. Divide by 24.
  4. Add 7.5 to get the temperature in Rømer.

Formulas

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

Fahrenheit to Rømer

°Rø = (°F − 32) × 7/24 + 7.5

This formula adjusts for the different zero points and scale intervals between the two temperature scales.

Example:

Input: °F = 68

Calculation: (68 − 32) × 7/24 + 7.5 = 36 × 7/24 + 7.5 = 10.5 + 7.5

Result: 18°Rø

Real-world use cases

Where this calculation shows up in everyday life.

Historical temperature records

Convert old temperature readings recorded in Rømer to modern Fahrenheit for comparison.

Example: A 1700s weather log lists 20°Rø; convert to Fahrenheit.

Educational demonstrations

Show how different temperature scales relate and practice unit conversions.

Example: Classroom exercise converting common temperatures.

Curiosity and trivia

Understand the scale used by early scientists and its relation to Celsius and Fahrenheit.

Example: Find the Rømer equivalent of body temperature (98.6°F).

Tips and common mistakes

Tips

  • Remember that 0°Rø is about 7.5°F, so the offset is 7.5.
  • The scale interval is 24/7 ≈ 3.4286 times larger than Fahrenheit's.
  • For quick mental estimates, multiply the Fahrenheit difference from 32 by 0.2917 and add 7.5.
  • Use a calculator for precise conversions, especially for extreme temperatures.

Common Mistakes to Avoid

  • Forgetting to subtract 32 before scaling.
  • Using the wrong factor (e.g., 7/24 vs 24/7).
  • Confusing the Rømer zero point with Celsius or Fahrenheit zero.

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.