Converters
Temperature Converter
Enter a temperature once, pick its scale, and see it in every other scale — Celsius, Fahrenheit, Kelvin, and Rankine — instantly.
Converted to all temperature scales
Tip: click any row to make that unit the input.
How It Works
Temperature scales have different zero points, so conversion uses formulas rather than simple factors: °F = °C × 9/5 + 32, K = °C + 273.15, °R = °F + 459.67. Everything is computed through kelvin, the SI unit.
Example
25 °C = 77 °F = 298.15 K = 536.67 °R
Frequently Asked Questions
How do I convert between two specific units?
Enter your value, select the unit it's in from the "From unit" dropdown, and read the result off the row for the unit you want. Clicking a row makes that unit the new input, so you can chain conversions.
What is the formula for Celsius to Fahrenheit?
°F = °C × 9/5 + 32. So 0 °C = 32 °F, 25 °C = 77 °F, and 100 °C = 212 °F. The two scales cross at −40°.
What are Kelvin and Rankine used for?
Kelvin is the SI absolute scale (0 K = absolute zero = −273.15 °C), used throughout science. Rankine is the absolute version of Fahrenheit (0 °R = absolute zero), used mainly in some US engineering fields.
Are the conversion factors exact?
Yes. The formulas are exact by definition: K = °C + 273.15 and °F = °C × 9/5 + 32. Displayed results are rounded for readability.