Convert Rømer to Celsius

Convert Rømer to Celsius Instantly

Use this free tool to convert Rømer (°Rø) to Celsius (°C) instantly. The Rømer scale is one of the oldest historical temperature scales, developed in 1701 by Danish astronomer Ole Christensen Rømer.

Although rarely used today, this converter is perfect for educators, historians, and students exploring the evolution of temperature measurement systems.

Rømer to Celsius Conversion Formula

To convert Rømer to Celsius, subtract 7.5 and multiply the result by 40/21:

°C = (°Rø − 7.5) × 40⁄21

• 0 °Rø ≈ −14.29 °C
• 7.5 °Rø = 0 °C
• 60 °Rø = 100 °C

Why Use This Rømer to Celsius Converter?

• 🧠 Great for historical science and academic research
• ⚡ Instant and accurate conversion
• 🔁 Supports reverse direction: Celsius to Rømer
• 📱 Fully responsive for all devices
• 🔓 No login, ads, or distractions

What Is the Rømer Scale?

The Rømer scale was created to measure the freezing and boiling points of brine and water. It predates both the Fahrenheit and Celsius scales and influenced later systems like Fahrenheit.

Rømer assigned 7.5 °Rø to freezing and 60 °Rø to boiling. Its historical importance lies in its influence on the development of modern temperature standards.

Convert Celsius to Rømer

To convert °C to °Rø, use:
°Rø = (°C × 21⁄40) + 7.5

Example: 100 °C = 60 °Rø

Use the “Swap” button in this converter to toggle between directions instantly.