What is the Rankine scale used for?

Rankine is an absolute temperature scale using Fahrenheit-sized degrees, historically used in US engineering and thermodynamics calculations where Fahrenheit is the working unit but a zero point at absolute zero is needed for the math.

Does it warn if I enter a temperature below absolute zero?

No, the converter performs the arithmetic conversion regardless of the value, so entering a Kelvin or Rankine figure below zero produces a mathematically consistent but physically impossible negative-absolute result without a warning.

How precise are the converted values?

Each converted value is rounded to two decimal places for readability, which is precise enough for weather, cooking or general engineering use but not for lab-grade calibration work that needs more significant figures.

What's the formula from Celsius to Fahrenheit?

Fahrenheit equals Celsius multiplied by nine-fifths, plus 32, which is the same formula this tool applies internally after first converting any input unit to Celsius as the common reference point.

Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine, locally.

Local, Runs entirely in your browser, your data never leaves your device.

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Convert one temperature into four units at once

Rather than a single-pair conversion, this tool takes one value and one source unit and lists it in all four temperature scales in use across everyday, scientific and engineering contexts: Celsius, Fahrenheit, Kelvin and the less common Rankine. It's handy for reading a sensor spec sheet in Kelvin, converting a US weather figure for a metric audience, or checking a thermodynamics formula that expects Rankine. The conversion is a few arithmetic operations, so it runs instantly and locally as you type.

How to use the Temperature Converter

Enter a numeric value into the Value field.
Choose the unit that value is currently in from the From dropdown: Celsius, Fahrenheit, Kelvin or Rankine.
Read the same temperature converted into all four units in the rows below, rounded to two decimals.
Copy any row's converted value with the copy button that appears on hover.

All conversions route through Celsius internally, so Fahrenheit-to-Kelvin, for instance, first converts to Celsius and then to Kelvin, rather than using a separate direct formula for every pair of units.

Rankine is Fahrenheit-scaled but zeroed at absolute zero, the way Kelvin is Celsius-scaled but zeroed at absolute zero, which is why it shows up mainly in older US engineering and thermodynamics references rather than everyday use.

Frequently asked questions

What is the Rankine scale used for?: Rankine is an absolute temperature scale using Fahrenheit-sized degrees, historically used in US engineering and thermodynamics calculations where Fahrenheit is the working unit but a zero point at absolute zero is needed for the math.
Does it warn if I enter a temperature below absolute zero?: No, the converter performs the arithmetic conversion regardless of the value, so entering a Kelvin or Rankine figure below zero produces a mathematically consistent but physically impossible negative-absolute result without a warning.
How precise are the converted values?: Each converted value is rounded to two decimal places for readability, which is precise enough for weather, cooking or general engineering use but not for lab-grade calibration work that needs more significant figures.
What's the formula from Celsius to Fahrenheit?: Fahrenheit equals Celsius multiplied by nine-fifths, plus 32, which is the same formula this tool applies internally after first converting any input unit to Celsius as the common reference point.