Temperature Converter
Convert a temperature between Celsius, Fahrenheit, Kelvin, and Rankine simultaneously.
Celsius
100.00 °C
Fahrenheit
212.00 °F
Kelvin
373.15 K
Rankine
671.67 °R
Recommended Settings
Pro Tips
- •Kelvin and Rankine are absolute temperature scales starting at absolute zero, so they're always positive for any physically possible temperature
- •Celsius and Kelvin share the same scale size (1 degree Celsius equals 1 kelvin) - they differ only by the 273.15 offset
- •Fahrenheit and Rankine likewise share the same scale size, both used primarily in the United States alongside Celsius and Kelvin used almost everywhere else
- •A result below -273.15°C is flagged as physically impossible, since nothing can be colder than absolute zero
Most Popular
Most people convert between Celsius and Fahrenheit for everyday temperatures like weather or cooking
When to Use This Tool
Convert an oven temperature between Celsius and Fahrenheit for a recipe from another country.
Convert a Kelvin measurement from a scientific instrument into a more familiar scale.
Convert a weather forecast's temperature to the unit you're used to.
See how Kelvin and Rankine relate to the everyday Celsius and Fahrenheit scales.
How It Works
Convert your entered value and unit into Celsius as a common intermediate representation
Convert that Celsius value into each of the four supported temperature scales
Flag any result below absolute zero as physically impossible
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Client-side temperature scale conversion for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
Why does Kelvin never go negative?
Kelvin is an absolute scale where zero represents absolute zero, the coldest physically possible temperature - so a valid Kelvin value can never be negative.
What's the formula for Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32: °F = °C × 9/5 + 32. This tool calculates it (and the reverse) automatically.
What is Rankine used for?
Rankine is an absolute temperature scale using Fahrenheit-sized degrees, occasionally used in some engineering and thermodynamics contexts in the United States.
Is my data sent anywhere?
No. All conversion happens locally in your browser.