Kelvin to Fahrenheit Converter

Use F = (K - 273.15) * 9/5 + 32. Subtract 273.15 to get Celsius, then multiply by 9/5 and add 32. Going back the other way, K = (F - 32) * 5/9 + 273.15. The calculator runs both directions in one step and shows Celsius and Rankine alongside.

0 K equals -459.67 F exactly. That is absolute zero, the lowest temperature physically possible. Anything below it (in any scale) is rejected by the calculator as unphysical.

300 K equals 80.33 F (26.85 C). Room temperature is usually given as 293.15 K (20 C / 68 F) or 298.15 K (25 C / 77 F), so 300 K is on the warm end of comfortable indoor air.

Rankine is the Fahrenheit twin of Kelvin: an absolute scale that uses the Fahrenheit degree size, so 0 R equals absolute zero and R = K * 9/5. US engineers in thermodynamics and gas-dynamics work (and most US-tradition heat-transfer textbooks) still use Rankine for the same reason scientists use Kelvin in Celsius countries. Showing both lets you cross-check engineering calculations without a second conversion.

The 13th General Conference on Weights and Measures dropped the degree symbol from the kelvin in 1967, so 273.15 K is correct and 273.15 deg K is not. Kelvin and Rankine are absolute temperature scales. Celsius and Fahrenheit use conventional zero points and retain the degree symbol.