Planck mass in natural-unit physics

planckMass is the mass scale formed from the reduced Planck constant, speed of light, and gravitational constant. Although tiny by everyday standards, it is enormous compared with particle masses.

Why it matters

Planck mass sets a characteristic scale in quantum-gravity discussions. It is related to planckLength and planckTime, which complete the natural scale family.

Caveats

It is not the mass of a known particle. Be careful whether a formula uses mass or energy; convert through speedOfLight and use pow for the squared c factor.

Use Planck Mass in a calculation

Enter planckMass on a calculator line to see its built-in value, or place the name inside a longer expression. Keep any displayed unit attached when converting or combining physical quantities, and check that every other value uses a compatible dimension.

The example above is editable, so you can replace surrounding values and test the constant in your own formula. Browse all constants to compare related values and notation.