# Fahrenheit to Rømer (°F to °Rø)

Source: https://www.unitconvertercalculator.com/temperature/fahrenheit-to-romer/

To convert Fahrenheit to Romer, use the formula: Ro = (F - 32) x 7/24 + 7.5. The Fahrenheit scale is the American everyday temperature standard, while the Romer scale is the early Danish scale that influenced Fahrenheit. Water freezes at 32 degrees F (7.5 Ro) and boils at 212 degrees F (60 Ro).

## Formula

°F via Kelvin to °Rø

## Conversion Table

| Fahrenheit (°F) | Rømer (°Rø) |
|---|---|
| -40 °F | -13.5 °Rø |
| 0 °F | -1.8333333333345 °Rø |
| 10 °F | 1.0833333333345 °Rø |
| 20 °F | 3.9999999999983 °Rø |
| 32 °F | 7.5 °Rø |
| 40 °F | 9.833333333331 °Rø |
| 50 °F | 12.75 °Rø |
| 60 °F | 15.666666666669 °Rø |
| 68 °F | 18 °Rø |
| 72 °F | 19.166666666666 °Rø |
| 75 °F | 20.041666666667 °Rø |
| 80 °F | 21.500000000002 °Rø |
| 90 °F | 24.416666666666 °Rø |
| 98.6 °F | 26.925 °Rø |
| 100 °F | 27.333333333335 °Rø |
| 120 °F | 33.166666666667 °Rø |
| 150 °F | 41.916666666669 °Rø |
| 200 °F | 56.499999999998 °Rø |
| 212 °F | 60 °Rø |
| 250 °F | 71.083333333333 °Rø |
| 300 °F | 85.666666666667 °Rø |
| 350 °F | 100.25 °Rø |
| 400 °F | 114.83333333333 °Rø |
| 450 °F | 129.41666666667 °Rø |
| 500 °F | 144 °Rø |

## Units

### Fahrenheit (°F)

A temperature scale where 32°F is the freezing point and 212°F is the boiling point of water. Primarily used in the United States.

### Rømer (°Rø)

A temperature scale proposed by Ole Christensen Rømer in 1701. Water freezes at 7.5 °Rø and boils at 60 °Rø. It influenced Fahrenheit's scale development.

## Background

The Fahrenheit scale was created by Daniel Gabriel Fahrenheit, 1724, dominant in the US. 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.

## Good to Know

The history of temperature measurement is the history of scientific collaboration and competition across borders. The Fahrenheit scale (dominant in the US) and the Romer scale (influenced Fahrenheit) represent different national contributions to solving the same fundamental problem: how to assign numbers to the sensation of hot and cold.

## FAQ

### How do you convert Fahrenheit to Romer?

Use the formula Ro = (F - 32) x 7/24 + 7.5. At the freezing point of water: 32 F = 7.5 Ro. At the boiling point: 212 F = 60 Ro.

### When would you need to convert Fahrenheit 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 32 F = 7.5 Ro. Water boils at 212 F = 60 Ro. These two fixed points anchor both scales and provide easy verification of any conversion calculation.

## Non-Frequently Asked Questions

### Did Fahrenheit steal from Romer?

Not exactly, but Fahrenheit definitely borrowed heavily. After visiting Romer in 1708, Fahrenheit adopted Romer's brine-zero concept and modified the scale. Fahrenheit expanded the degree size and added his own calibration points. It was more 'inspired by' than 'stolen from,' but Romer's contribution is rarely acknowledged in American thermometry history.

### Why did Fahrenheit succeed where Romer failed?

Fahrenheit made better thermometers. His use of mercury instead of alcohol produced more consistent, reproducible readings. Romer's scientific contribution was the concept; Fahrenheit's was the engineering. In measurement, a brilliant idea in a mediocre instrument loses to a good idea in a brilliant instrument every time.

### If Romer had marketed his scale better, would America use it today?

Unlikely. Romer's scale has water freezing at 7.5 degrees - a number that resists intuitive use. Fahrenheit's 32 is also odd, but the overall 0-to-212 range gives weather temperatures comfortable two-digit numbers (20s to 100s). Romer's 0-to-60 range would compress weather into single digits for cold and teens for hot. Scale range matters for daily usability.

## Related Articles

- [Why We Measure: The Deepest Urge in Human Civilisation](https://www.unitconvertercalculator.com/blog/why-we-measure)
- [The Map Is Not the Territory: Why Every Measurement Is Wrong](https://www.unitconvertercalculator.com/blog/the-map-is-not-the-territory)
- [Zero: The Most Dangerous Number in Measurement](https://www.unitconvertercalculator.com/blog/zero-the-most-dangerous-number-in-measurement)
- [The Speed of Everything: How We Measure From Glaciers to Light](https://www.unitconvertercalculator.com/blog/the-speed-of-everything)
- [Why Your Recipe Is Lying to You: The Chaos of Cooking Measurements](https://www.unitconvertercalculator.com/blog/why-recipe-measurements-are-unreliable)
- [When Measurements Go Wrong - Disasters, Blunders and Happy Accidents](https://www.unitconvertercalculator.com/blog/when-measurements-go-wrong)
- [The Surprising Stories Behind Everyday Units of Measurement](https://www.unitconvertercalculator.com/blog/stories-behind-measurement-units)
- [Metric vs. Imperial - The Complete Guide to the World's Two Measurement Systems](https://www.unitconvertercalculator.com/blog/metric-vs-imperial-complete-guide)
- [Temperature Conversion Guide for Travel, Cooking & Weather](https://www.unitconvertercalculator.com/blog/temperature-conversion-guide)

## See Also

- [Rømer to Fahrenheit](https://www.unitconvertercalculator.com/temperature/romer-to-fahrenheit/)