Romer is a historical temperature scale.
Romers to Reaumurs Converter — Ro to Re
Convert Romer (Ro) to Reaumur (Re) using the exact temperature formula. See the formula, worked examples, and conversion table.
Romers to Reaumurs 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.
Reaumur is a historical 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 Reaumurs
Romer and Reaumur are both historical temperature scales no longer in everyday use — this conversion is mainly useful for historical reference or comparing older scientific texts against each other.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 = -11.42857143 °C
0 romers = -11.42857143 reaumurs.
Real-world example
(0 − 32) × 5/9 = -11.42857143 °C
0 romers = -11.42857143 reaumurs.
Conversion table
| Romer (Ro) | Reaumur (Re) |
|---|---|
| -40 Ro | -72.38095238 Re |
| -20 Ro | -41.9047619 Re |
| 0 Ro | -11.42857143 Re |
| 20 Ro | 19.04761905 Re |
| 37 Ro | 44.95238095 Re |
| 100 Ro | 140.952381 Re |
Reverse conversion: Reaumur to Romer
(-9.904761905 − 32) × 5/9 = 0.9999999998 °C
-9.904761905 reaumurs = 0.9999999998 romers.
Convert the source temperature to Kelvin, then convert Kelvin to the target scale.
For a page dedicated to this direction, see Reaumur to Romer.
Understanding the Romer (Ro)
Romer is a historical temperature scale.
Understanding the Reaumur (Re)
Reaumur is a historical temperature scale.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many reaumurs are in 1 romer?
1 romer equals -9.904761905 reaumurs, using the offset temperature formula rather than an estimate.
How do I convert romer to reaumur?
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 reaumur back to romer?
Use the reverse factor: 1 reaumur equals 8.15625 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 reaumur?
Reaumur (Re) is a unit of temperature.
Is the Romer to Reaumur 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.