Temperature Converter
Instantly convert between Celsius, Fahrenheit, and Kelvin. Enter any value and get all three units at once — no button needed.
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Quick Converters
How Temperature Conversion Works
The three most common temperature scales are Celsius (°C), Fahrenheit (°F), and Kelvin (K). Each scale has a different zero point and degree size, so converting between them requires a simple formula rather than a fixed ratio.
- °F = (°C × 9/5) + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
Frequently Asked Questions
How do I use this temperature converter?
Select your source unit (Celsius, Fahrenheit, or Kelvin) from the dropdown, type your value into the input field, and all three converted results appear instantly below.
What is the formula to convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 (1.8) and then add 32. For example, 100 °C × 1.8 + 32 = 212 °F — the boiling point of water.
What is absolute zero in Celsius and Fahrenheit?
Absolute zero is 0 K, which equals −273.15 °C or −459.67 °F. It is the theoretical lowest possible temperature where all molecular motion stops.
Why does the US use Fahrenheit while most countries use Celsius?
The United States adopted the Fahrenheit scale in the early 18th century and never switched to the metric system. Most other countries transitioned to Celsius as part of metrication during the 20th century.