Rankine to Fahrenheit Converter
Quick Conversion: F = R − 459.67
Rankine to Fahrenheit Converter
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How to Convert Rankine to Fahrenheit
The formula is:
F = R − 459.67
exact This conversion factor is exact by international definition.
Temperature conversion chart
| To Fahrenheit | To Celsius | To Kelvin | |
| From Fahrenheit (F) | F | (F - 32) × 5/9 | (F - 32) × 5/9 + 273.15 |
| From Celsius (C or o) | (C × 9/5) + 32 | C | C + 273.15 |
| From Kelvin (K) | (K - 273.15) × 9/5 + 32 | K - 273.15 | K |
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About the Rankine
Facts & Uses
- Absolute temperature scale using Fahrenheit-sized degrees: 0 °R = absolute zero, 491.67 °R = water freezing, 671.67 °R = water boiling.
- Used in US engineering disciplines — particularly thermodynamics, propulsion, HVAC, and aerospace — where absolute temperature is needed but Fahrenheit-sized increments are preferred.
- Conversion is simple: °R = °F + 459.67 exactly. The relationship to Kelvin is K = °R × 5/9.
- Found in steam tables, combustion analysis, and NIST reference data for the United States engineering community.
Curiosities
- Proposed by William John Macquorn Rankine (1820-1872), Scottish engineer and physicist, in 1859 — eleven years after Kelvin proposed his absolute scale.
- Rankine is the only widely-used absolute scale based on the Fahrenheit increment; its existence persists because US engineering standards predate metrication.
- One Rankine degree equals one Fahrenheit degree in size (5/9 of a Kelvin), so temperature differences in Rankine = temperature differences in Fahrenheit.
- Most modern textbooks and ISO standards have moved to Kelvin even in the US, but Rankine still appears in mechanical engineering reference tables and FAA aviation publications.
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About the Fahrenheit
Facts & Uses
- Primary scale in the United States for weather, body temperature, cooking, and HVAC. Devised by Daniel Gabriel Fahrenheit in 1724.
- Body temperature: 98.6 °F normal (Wunderlich, 1868), 100.4 °F = 38 °C low fever, 104 °F+ = 40 °C high fever.
- US oven standards: 350 °F baking, 375 °F roasting, 400-425 °F high-heat roasting, 450-500 °F broiling/pizza.
- Weather references: 32 °F = freezing, 70 °F = comfortable room temp, 90 °F+ = hot summer day, 0 °F = bitter cold (≈ −18 °C).
Curiosities
- Fahrenheit's original scale used three reference points: 0 °F = freezing brine (saltwater + ammonium chloride), 32 °F = pure water freezing, 96 °F = average human body temp (later refined to 98.6 °F).
- The 180-degree gap between freezing (32) and boiling (212) of water is no accident — Fahrenheit chose it because 180 has many divisors, useful for scale subdivision.
- Ray Bradbury's novel Fahrenheit 451 takes its title from the temperature at which book paper supposedly auto-ignites — though the actual flash point of paper is closer to 450-475 °F depending on type.
- Approximate equivalents: 32 °F = 0 °C; 100 °F ≈ 37.8 °C (warm fever); 212 °F = 100 °C (boiling); −40 °F = −40 °C.
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Looking for the reverse? Convert Fahrenheit to Rankine
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All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.
Related in other categories:
- BTU to Joules — 1 BTU raises 1 lb of water by 1 °F
Conversion factors verified against NIST, BIPM, ITS-90 (International Temperature Scale)
Defined by the absolute thermodynamic scale (Kelvin).
Last reviewed: March 2026
