Celsius to Rankine (°C to °R)
Result
493.47 Rankine
Formula
°R = °C × 1.8 + 491.67
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 °C × 1.8 + 491.67 = 493.47 °R
- 10 °C × 1.8 + 491.67 = 509.67 °R
- 100 °C × 1.8 + 491.67 = 671.67 °R
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.
Celsius to Rankine table
| Celsius (°C) | Rankine (°R) |
|---|---|
| 1 | 493.47 |
| 2 | 495.27 |
| 5 | 500.67 |
| 10 | 509.67 |
| 20 | 527.67 |
| 50 | 581.67 |
| 100 | 671.67 |
| 1,000 | 2,291.67 |
The units
- Celsius (°C)
- Celsius: the kelvin temperature minus 273.15. Water freezes at about 0 °C and boils at about 100 °C at sea level.
- Rankine (°R)
- A unit of temperature.
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