Rankine to Fahrenheit (°R to °F)
Result
-458.67 Fahrenheit
Formula
°F = °R × 1 − 459.67
The kelvin is the SI base unit, defined through the Boltzmann constant. A Celsius temperature is the kelvin temperature minus 273.15, and a Fahrenheit degree is 5/9 of a Celsius degree with water freezing at 32 °F. Rankine uses Fahrenheit-sized degrees from absolute zero.
Worked examples
- 1 °R × 1 − 459.67 = -458.67 °F
- 10 °R × 1 − 459.67 = -449.67 °F
- 100 °R × 1 − 459.67 = -359.67 °F
Common mistakes
- Temperature readings and temperature differences convert differently: a reading uses °F = °C × 9/5 + 32, but a change of 10 °C is a change of 18 °F (no +32).
- −40 is the same reading in °C and °F; the popular "double it and add 30" shortcut drifts several degrees away from about 10 °C.
- Kelvin is written without a degree sign (300 K) and cannot be negative.
Rankine to Fahrenheit table
| Rankine (°R) | Fahrenheit (°F) |
|---|---|
| 1 | -458.67 |
| 2 | -457.67 |
| 5 | -454.67 |
| 10 | -449.67 |
| 20 | -439.67 |
| 50 | -409.67 |
| 100 | -359.67 |
| 1,000 | 540.33 |
The units
- Rankine (°R)
- A unit of temperature.
- Fahrenheit (°F)
- Fahrenheit: degrees 5/9 the size of Celsius degrees, with water freezing at 32 °F and boiling at 212 °F at sea level.
Sources for these factors
- The International System of Units (SI Brochure), 9th edition — BIPM
- Guide for the Use of the International System of Units (SP 811), Appendix B: conversion factors — NIST
- Handbook 44 (2024), Appendix C: General Tables of Units of Measurement — NIST
Last reviewed against these sources. An automated check recomputes every factor from its definition on each build. How we check accuracy