Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Free online temperature converter, no signup required.

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Frequently asked questions

What is the formula for Celsius to Fahrenheit?
°F = (°C × 9/5) + 32. So 100°C = 212°F (boiling point of water) and 0°C = 32°F (freezing point).
What is Kelvin used for?
Kelvin is the SI unit for absolute temperature. 0 K is absolute zero (-273.15°C), the theoretical lowest temperature possible.
What is Rankine?
Rankine is an absolute temperature scale used in some US engineering contexts. 0 °R = absolute zero, and the degree size matches Fahrenheit.
How accurate is the conversion?
Conversions use exact IEEE 754 floating-point math, rounded to 2 decimal places for display.