From Rankine
Rankine to Celsius
C = (R − 491.67) × 5/9
Convert °R to °C — U.S. thermo absolute to metric weather/lab scale.
°R → °C →Rankine to Fahrenheit
F = R − 459.67
Convert °R to °F — drop the absolute offset, keep the same degree size.
°R → °F →Rankine to Kelvin
K = R × 5/9
Convert °R to K — both absolute; only degree size differs by factor of 5/9.
°R → K →Three focused converters for translating Rankine to each of the other three standard scales. Rankine is the absolute scale used in some U.S. engineering disciplines (HVAC, thermodynamics, combustion engineering) where Fahrenheit-sized degrees are convenient and an absolute reference is required.
Most everyday temperature work doesn't use Rankine; these converters are for U.S. engineering homework, textbook problems, or industry references that express absolute temperatures in °R.
When to use these converters
Use these when a problem statement, textbook, or technical spec expresses an absolute temperature in Rankine and you need to translate to a more familiar scale. The most common direction is °R to °F (drop the absolute offset) for U.S. consumer-facing reporting; °R to °C and °R to K for international or scientific audiences.
Frequently Asked Questions
- What's the formula for Rankine to Fahrenheit?
- F = R − 459.67. Same-sized degree, different zero. Rankine's zero is at absolute zero; Fahrenheit's zero is 459.67 degrees warmer.
- What's the formula for Rankine to Celsius?
- C = (R − 491.67) × 5/9. Convert to Fahrenheit first (subtract 459.67), then to Celsius (subtract 32, scale by 5/9). Combined: subtract 491.67, multiply by 5/9.
- What's the formula for Rankine to Kelvin?
- K = R × 5/9. Both absolute; differ only in degree size. Scaling by 5/9 converts Fahrenheit-sized to Celsius-sized degrees.