What is the formula to convert Kelvin to Rankine?

°Ra = K × 1.8. Since both scales share absolute zero, the conversion is a simple multiplication by exactly 9/5 (1.8).

What is the formula to convert Rankine to Kelvin?

K = °Ra ÷ 1.8. Divide the Rankine value by 1.8 to get Kelvin.

Why is 1 Rankine degree equal to 1 Fahrenheit degree?

The Rankine scale uses the same degree size as Fahrenheit but is anchored at absolute zero (0 °Ra = −459.67°F). So a change of 1°F equals a change of 1 °Ra.

What is absolute zero in Rankine?

Absolute zero is 0 K = 0 °Ra. Both scales share the same zero point — the coldest theoretically possible temperature.

What is room temperature in Rankine?

Standard room temperature (~293.15 K / 20°C) equals approximately 527.67 °Ra.

Where is the Rankine scale used?

The Rankine scale is used mainly in engineering thermodynamics in the United States, particularly in mechanical and aerospace engineering where US customary units are standard.

Kelvin to Rankine Converter

Name: Kelvin to Rankine Converter
Availability: InStock
Author: Nham Vu

Enter a Kelvin value and instantly get the Rankine equivalent using the exact formula Ra = K × 1.8, with a scientific reference table.

Temperature Converter

Kelvin (K)

Rankine (°Ra)

°Ra

Scientific Reference Temperatures

Click a row to load it

Description	K	°Ra

Summary

Enter a Kelvin value and instantly get the Rankine equivalent using the exact formula Ra = K × 1.8, with a scientific reference table.

How it works

Enter a temperature in the Kelvin field to get the Rankine equivalent instantly.
Type in the Rankine field to convert in the opposite direction.
The formula box shows the exact calculation used.
Browse the reference table for common scientific temperatures in both scales.
Click any row in the table to load that value into the converter.
Click "Clear" to reset both fields.

Use cases

Convert thermodynamic calculations between SI (Kelvin) and US customary (Rankine) units.
Cross-check engineering textbook values that mix Kelvin and Rankine.
Understand Rankine scale references in older US thermodynamics literature.
Convert cryogenic temperatures for aerospace or industrial refrigeration work.
Verify Rankine values for steam tables used in mechanical engineering.
Quickly find the Rankine equivalent of any absolute temperature for thermodynamic equations.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu