# Planck Temperature Constant

Use Planck Temperature in Calcul.io. See what this built-in constant represents, enter it in an editable calculation, and review related values and units.

## planckTemperature

Planck temperature

Try it yourself:

```calculio
planckTemperature
```

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## 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](https://calcul.io/constants/boltzmann/index.md), which converts temperature to energy, and [planckMass](https://calcul.io/constants/planckMass/index.md).

## Caveats

This is not a practical thermometry value and does not describe an ordinary material temperature. Keep kelvin and energy units distinct; use [multiply](https://calcul.io/function/multiply/index.md) only with the appropriate Boltzmann conversion.

[All constants](https://calcul.io/constants/index.md)