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Calculator for the Planck Temperature
Conversion of different units of temperature to the Planck temperature.
The Planck temperature TP is 1.416764*1032 Kelvin. This is the highest theoretically possible temperature that prevailed at the moment of the Big Bang and that can be reached during the formation of a black hole.
Please enter a temperature in degrees Celsius, degrees Fahrenheit or Kelvin. The other temperatures will be calculated. The Planck temperature is calculated as a ratio to the temperature in Kelvin, because such a calculation is not possible with Celsius and Fahrenheit. ^ means to the power of.
Example: the temperature inside the sun is about 15600000 Kelvin (15.6 million). This is for the factor 10-25 lower than the Planck temperature, one tenth of a septillionth.
At the Planck temperature, the energy of particles would be so extremely high that even the structure of space and time would be dominated by quantum effects of gravity. Beyond this temperature, our current physical models lose their validity, as the four fundamental forces of nature, gravity, the strong nuclear force, the weak nuclear force, and electromagnetism, presumably merge into a single, unified force. The Planck temperature thus marks the absolute limit beyond which we can no longer make reliable predictions. It also suggests that at such energies, matter no longer consists of known particles like quarks or electrons, but possibly of fundamental strings or other exotic objects, as discussed in string theory or loop quantum gravity. This temperature cannot be reached anywhere in the universe today. Even the temperatures inside the hottest stars or during collisions in particle accelerators remain many orders of magnitude lower.
Last updated on 01/09/2026. Author: Jürgen Kummer
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