Planck temperature: an extreme thermal scale

planckTemperature is the natural temperature built from fundamental constants. It represents an extraordinarily high scale where thermal energy approaches Planck-scale physics.

Context

It is useful for nondimensional early-universe and quantum-gravity estimates. Compare boltzmann, which converts temperature to energy, and planckMass.

Caveats

This is not a practical thermometry value and does not describe an ordinary material temperature. Keep kelvin and energy units distinct; use multiply only with the appropriate Boltzmann conversion.

Use Planck Temperature in a calculation

Enter planckTemperature 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.