Rankine to Rømer (°R to °Rø) Converter

Rankine to Rømer: What You Need to Know

The Rankine scale was created by William Rankine, 1859, used in American aerospace and chemical engineering. The Romer scale was created by Ole Romer, Danish astronomer, around 1701, influenced Fahrenheit. Converting between them bridges different eras and different measurement philosophies in the history of thermometry.

Going the other way? Use our Rømer to Rankine converter.

Rankine to Rømer FAQ

• How do you convert Rankine to Romer?

  Use the formula Ro = (R - 491.67) x 7/24 + 7.5. At the freezing point of water: 491.67 R = 7.5 Ro. At the boiling point: 671.67 R = 60 Ro.

• When would you need to convert Rankine to Romer?

  This conversion is needed when interpreting historical scientific records, comparing temperature data across different measurement traditions, or completing engineering calculations that mix temperature scales from different national standards.

• What are the key reference points for both scales?

  Water freezes at 491.67 R = 7.5 Ro. Water boils at 671.67 R = 60 Ro. These two fixed points anchor both scales and provide easy verification of any conversion calculation.

Non-Frequently Asked Questions About Rankine to Rømer

Questions nobody should ask - but someone did.

• Is Rankine-to-Romer the most obscure temperature conversion possible?

  It is arguably the most obscure conversion between named temperature scales. Rankine is used by a small group of American engineers. Romer is used by essentially nobody. The intersection of people who need to convert between them is so small it might actually be empty. This conversion exists because conversion tables aim for completeness, not for anticipated demand.

• Would William Rankine have known about Romer's scale?

  Possibly. Rankine was a well-read Scottish engineer and physicist who would have encountered Romer's name in the history of thermometry. But he created the Rankine scale (1859) for American engineering purposes, not for historical comparison with a defunct Danish scale. Rankine wanted practical absolute temperatures; Romer was a historical footnote by then.

• If all seven temperature scales in this converter held an election, which would win?

  Celsius would win by landslide - used by roughly 95 percent of the world's population. Fahrenheit would come second with 330 million American voters. Kelvin would win the scientific community's endorsement. Rankine would carry a few engineering departments. Newton, Delisle, Reaumur, and Romer would each receive approximately zero votes, splitting the obsolescence demographic evenly.

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