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Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin.

How to Use

Enter a temperature value and select your source unit from the available options: Celsius (°C), Fahrenheit (°F), Kelvin (K), or Rankine (°R). The tool accepts decimal values and negative numbers for units that support them (Celsius and Fahrenheit can be negative; Kelvin and Rankine cannot go below zero).
The converter instantly displays the equivalent temperature in all other units simultaneously. For example, entering 100°C shows 212°F, 373.15 K, and 671.67 °R — no need to convert one direction at a time. The precision updates as you type.
Copy any of the converted values individually or use the batch result for your calculations. Handy for cooking recipe conversions, science lab reports, weather comparisons between regions, or engineering thermal calculations.

What temperature scales does this converter support?: It supports Celsius (°C) — the metric standard used worldwide, Fahrenheit (°F) — used primarily in the US and a few territories, Kelvin (K) — the SI scientific absolute scale starting at absolute zero (−273.15°C), and Rankine (°R) — the Fahrenheit-based absolute scale used in some engineering thermodynamics fields.
What is absolute zero and how is it handled?: Absolute zero is the lowest theoretically possible temperature: −273.15°C, −459.67°F, 0 K, and 0 °R. At this point, molecular motion stops completely. The converter correctly handles values down to absolute zero and will flag any attempt to enter a Kelvin or Rankine value below zero.
Why does Kelvin not use a degree symbol?: Kelvin is an absolute thermodynamic temperature scale — its unit is simply 'kelvin' (lowercase k in full form, symbol K). It's the SI base unit for temperature. Most scientific style guides specify: 25°C, 77°F, but 298 K (never °K). The Rankine scale follows the same convention: 500 °R (not 500°R).