Convert Celsius to Rømer

Convert Celsius (°C) to Rømer (°Rø) instantly and accurately.

Conversion Formula

°Rø = °C × 21/40 + 7.5

About Celsius

Celsius (°C) is the most widely used temperature scale worldwide, named after Swedish astronomer Anders Celsius (1742). It's based on the freezing point of water at 0°C and boiling point at 100°C under standard atmospheric pressure (1 atmosphere). This makes it intuitive for daily use: room temperature is around 20-22°C, body temperature is 37°C, and a hot summer day might reach 35-40°C. It's the standard in science, medicine, and weather reporting in most countries.

About Rømer

Rømer (°Rø) was designed by Danish astronomer Ole Christensen Rømer in 1701, making it one of the earliest calibrated temperature scales using two fixed points. It sets water's freezing point at 7.5°Rø and boiling point at 60°Rø; the offset of 7.5 at freezing was chosen to avoid negative numbers during the coldest Danish winters. In 1708, Daniel Gabriel Fahrenheit visited Rømer and was directly inspired by his thermometer design to create the Fahrenheit scale. Body temperature on the Rømer scale is approximately 22.5°Rø. Though now obsolete, Rømer's scale holds an important place in thermometric history.

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