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Calculator for the Planck Mass

Conversion of different units of mass to the Planck mass.

The Planck mass m_P is 2.176434*10^-8 kilograms. That is about one fifty-thousandth of a gram and, in contrast to the Planck length and Planck time, is within the range that is accessible and measurable to us. But it is anything but easy to explain.
The Planck mass is the mass of the hypothetical Planck particle. This is a tiny black hole whose Compton wavelength is equal to the Schwarzschild radius. The surface of this particle is the Planck area, which is the Planck length squared. The Planck mass is the largest mass that a particle with a Planck surface can have.
Please enter a value and select a unit of mass. It will be calculated how many Planck masses correspond to this input. ^ means to the power of.

atomic mass unit, unanograms, ngmicrograms, μgmilligrams, mggrams, gkilograms, kgtons, tkilotons, ktpounds, lb



This mass corresponds to ... * 10^... Planck lengths.

Example: 10 micrograms, a good value for particulate matter per cubic meter of air, is a little less than half a Planck mass.

The Planck mass marks a boundary beyond which quantum effects and gravity become equally important. An object with this mass would exert such a strong gravitational pull on the Planck length scale that it would collapse into a tiny black hole. At the same time, it would be so small that its quantum properties, such as the wavelength associated with its mass, could no longer be ignored. This duality makes the Planck mass a crucial research topic: it connects the world of quantum physics with general relativity and could provide clues to a theory of quantum gravity.
Although the Planck mass appears rather small, it is enormous for particle physics: it is about 10¹⁹ times heavier than a proton. This means that even the most powerful particle accelerators, such as the LHC at CERN, cannot come close to reaching the energies required to create a Planck particle.

Last updated on 01/09/2026. Author: Jürgen Kummer

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