Fahrenheit to Reaumur Converter
Enter the value that you want to convert Fahrenheit (°F) to Reaumur (°r) or Reaumur to Fahrenheit.Also written as °F to °R conversion.
1 Fahrenheit = -13.7777778 Reaumur
Formula: °Ré = (°F − 32) × 4/9
°F to °R — Fahrenheit to Reaumur
10 Fahrenheit = -9.77778 Reaumur
Popular Temperature Converters:
Temperature Scale Comparison Chart
Fahrenheit vs Reaumur
What is Fahrenheit?
Daniel Gabriel Fahrenheit developed this scale in 1724, setting 0°F as the temperature of a brine solution and 96°F as human body temperature.
Fahrenheit (°F) remains the primary temperature scale in the United States, the Bahamas, and a few other countries. Water freezes at 32°F and boils at 212°F. Americans use it for weather reports, cooking (oven temperatures: 350°F, 400°F, 450°F), thermostat settings, and body temperature (98.6°F normal). The scale offers finer resolution for weather — the 0-100°F range covers most human-habitable temperatures.
Understanding the Reaumur
The Réaumur scale sets water's freezing point at 0° and boiling point at 80°, created by French scientist René Antoine Ferchault de Réaumur in 1730.
Once widely used in Europe (particularly France, Germany, and Russia), the Réaumur scale (°Ré) has been almost entirely replaced by Celsius. However, it persists in some traditional industries: Italian and Swiss cheese-making (specifying milk temperatures during production), some French cooking traditions, and historical weather records. The scale is notable for having only 80 divisions between freezing and boiling, making each Réaumur degree 1.25 Celsius degrees.
Temperature Scales in Context
Temperature conversion is one of the few non-linear unit conversions people encounter daily. Celsius dominates scientific work and most countries, Fahrenheit remains standard in the US for weather and cooking, Kelvin is required in thermodynamics and gas law calculations, and Rankine appears in some US engineering applications. Converting between these scales requires formulas rather than simple multiplication.
Fahrenheit to Reaumur metric conversion table
| 0.01 °F | = | -14.21778 °r |
| 0.1 °F | = | -14.17778 °r |
| 1 °F | = | -13.77778 °r |
| 2 °F | = | -13.33333 °r |
| 3 °F | = | -12.88889 °r |
| 4 °F | = | -12.44444 °r |
| 5 °F | = | -12.00000 °r |
| 6 °F | = | -11.55556 °r |
| 7 °F | = | -11.11111 °r |
| 8 °F | = | -10.66667 °r |
| 9 °F | = | -10.22222 °r |
| 10 °F | = | -9.77778 °r |
| 11 °F | = | -9.33333 °r |
| 12 °F | = | -8.88889 °r |
| 13 °F | = | -8.44444 °r |
| 14 °F | = | -8.00000 °r |
| 15 °F | = | -7.55556 °r |
| 16 °F | = | -7.11111 °r |
| 17 °F | = | -6.66667 °r |
| 18 °F | = | -6.22222 °r |
| 19 °F | = | -5.77778 °r |
| 20 °F | = | -5.33333 °r |
| 30 °F | = | -0.88889 °r |
| 40 °F | = | 3.55556 °r |
| 50 °F | = | 8.00000 °r |
| 60 °F | = | 12.44444 °r |
| 70 °F | = | 16.88889 °r |
| 80 °F | = | 21.33333 °r |
| 90 °F | = | 25.77778 °r |
| 100 °F | = | 30.22222 °r |
| 200 °F | = | 74.66667 °r |
| 300 °F | = | 119.11111 °r |
| 400 °F | = | 163.55556 °r |
| 500 °F | = | 208.00000 °r |
| 600 °F | = | 252.44444 °r |
| 700 °F | = | 296.88889 °r |
| 800 °F | = | 341.33333 °r |
| 900 °F | = | 385.77778 °r |
| 1000 °F | = | 430.22222 °r |
How to Convert °F to °R (Fahrenheit to Reaumur)?
We can convert Fahrenheit to Reaumur by using an example.
Example:
Convert 20 Fahrenheit to Reaumur?
We know 1 Fahrenheit = -13.7777778 Reaumur; 1 Reaumur = 34.2500000 Fahrenheit.
20 Fahrenheit = ___°r
20 × -13.7777778 = -5.33333 °r (we know 1 Fahrenheit = -13.7777778 Reaumur)
Answer:
20 Fahrenheit = -5.33333 Reaumur
How to Convert Fahrenheit to Réaumur
This requires first converting to Celsius, then to Réaumur: °Ré = (°F - 32) × 4/9:
- Subtract 32 from the Fahrenheit value.
- Multiply by 4/9 (≈ 0.4444).
- The result is Réaumur.
Solved Examples
Question 1: Convert 212°F (boiling) to Réaumur.
Solution:
°Ré = (212 - 32) × 4/9
= 180 × 4/9
= 80
Answer: 212°F = 80°Ré
Question 2: Convert 98.6°F (body temp) to Réaumur.
Solution:
°Ré = (98.6 - 32) × 4/9
= 66.6 × 4/9
= 29.6
Answer: 98.6°F = 29.6°Ré
Practice Questions
Try solving these on your own to test your understanding:
- Convert 68°F to Réaumur. (Answer: 16°Ré)
- What is 50°F in Réaumur? (Answer: 8°Ré)
- Convert 140°F to Réaumur. (Answer: 48°Ré)
Key Takeaways
- °Ré = (°F - 32) × 4/9.
- 32°F = 0°Ré (freezing), 212°F = 80°Ré (boiling).
- Rarely needed today except for historical recipe interpretation.
Fahrenheit to Reaumur Conversion Formula
°Ré = (°F − 32) × 4/9
1 Fahrenheit = -13.7777778 Reaumur
1 Reaumur = 34.2500000 Fahrenheit
Frequently Asked Questions
How many Reaumur are in 1 Fahrenheit?
1 Fahrenheit equals -13.77778 Reaumur. Note: Temperature conversion uses a formula, not simple multiplication.
How do I convert Fahrenheit to Reaumur?
Use the conversion formula shown above. For example, -12.00 Reaumur equals 5 Fahrenheit. Temperature scales have different zero points, so a formula (not simple multiplication) is required.
How do I convert Reaumur to Fahrenheit?
Use the reverse formula. 1 Reaumur equals 34.25000 Fahrenheit. See the formula section above for the exact equation.
What is 10 Fahrenheit in Reaumur?
10 Fahrenheit is equal to -9.77778 Reaumur.
What is 100 Fahrenheit in Reaumur?
100 Fahrenheit is equal to 30.22222 Reaumur.