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Calculator for the Planck Energy
Conversion of different units of mass to the Planck energy.
The Planck energy EP is 1.956*109 or almost 2 billion joules. This is about half a megawatt hour and thus in the range of larger electricity storage. An elementary particle with the Planck energy could only be described by a theory of quantum gravity, which does not yet exist. Planck energy is calculated as Planck mass times the square of the speed of light.
Please enter a value and select a unit of mass. It will be calculated how many Planck energies correspond to this input. ^ means to the power of.
Example: the Higgs boson with the rest energy of 125.25 GeV corresponds to about 10^-17 times the Planck energy.
The Planck energy corresponds to the energy a particle with Planck mass would have if it were completely converted into energy. This energy for a single particle is so extremely high that it exceeds the limits of our current physics. The world's largest particle accelerators, such as the LHC at CERN, achieve collision energies of about 10^13 electron volts. This is still 10^15 times less than the Planck energy. Even the most energetic cosmic rays we observe don't come close to this scale. The Planck energy thus marks the limit beyond which spacetime itself would be so distorted by quantum effects that our current models of general relativity and quantum field theory would break down. Here, effects such as the formation of tiny black holes or the unification of all fundamental forces would be expected. These are phenomena for which we still have no experimentally confirmed theory (as of 2026). The Planck energy is therefore not only a theoretical quantity but also an indication of how incomplete our understanding of the universe still is at the smallest scales. It shows that the laws of nature may look completely different with such energies than in the usual world.
Last updated on 01/09/2026. Author: Jürgen Kummer
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