Romer is a historical temperature scale.
Romers to Rankines Converter — Ro to R
Convert Romer (Ro) to Rankine (R) using the exact temperature formula. See the formula, worked examples, and conversion table.
Romers to Rankines converter
Converter
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Reaumur, and Romer.
Context values
Some unit families need one extra value for a physically accurate result.
Rankine is an absolute Fahrenheit-based temperature scale.
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
Temperature conversion uses Kelvin as the intermediate absolute scale.
Reserved above the conversion cards and below the converter.
About Converting Romers to Rankines
Romer and Rankine are both historical temperature scales no longer in everyday use — this conversion is mainly useful for historical reference or comparing older scientific texts against each other.
Formula
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
Both scales are converted through Kelvin as a common absolute reference point.
Simple example
(0 − 32) × 5/9 = 465.9557143 °C
0 romers = 465.9557143 rankines.
Real-world example
(0 − 32) × 5/9 = 465.9557143 °C
0 romers = 465.9557143 rankines.
Conversion table
| Romer (Ro) | Rankine (R) |
|---|---|
| -40 Ro | 328.8128571 R |
| -20 Ro | 397.3842857 R |
| 0 Ro | 465.9557143 R |
| 20 Ro | 534.5271429 R |
| 37 Ro | 592.8128571 R |
| 100 Ro | 808.8128571 R |
Reverse conversion: Rankine to Romer
(469.3842857 − 32) × 5/9 = 0.9999999958 °C
469.3842857 rankines = 0.9999999958 romers.
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
For a page dedicated to this direction, see Rankine to Romer.
Understanding the Romer (Ro)
Romer is a historical temperature scale.
Understanding the Rankine (R)
Rankine is an absolute Fahrenheit-based temperature scale.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rankines are in 1 romer?
1 romer equals 469.3842857 rankines, using the offset temperature formula rather than an estimate.
How do I convert romer to rankine?
Use the formula shown above: it involves both a multiplication and an addition/subtraction because the two scales don't share a common zero point.
How do I convert rankine back to romer?
Use the reverse factor: 1 rankine equals -135.6120833 romers. You can also use the swap control in the converter above to flip the direction instantly.
What is a romer?
Romer (Ro) is a unit of temperature.
What is a rankine?
Rankine (R) is a unit of temperature.
Is the Romer to Rankine conversion exact?
Yes. Both scales are formally defined relative to the Kelvin scale, so the conversion formula is exact — the only rounding involved is in how many decimal places you choose to display.