# Planck Time

Written by Jerry Ratzlaff on . Posted in Relativity

## Planck Time Formula

 $$\large{ t_p = \sqrt{ \frac{ h\;G } { c^5 } } }$$

### Where:

 Units English SI $$\large{ t_p }$$ = Planck time $$\large{sec}$$ $$\large{s}$$ $$\large{ G }$$ = gravitational constant $$\large{\frac{lbf-ft^2}{lbm^2}}$$ $$\large{\frac{N - m^2}{kg^2}}$$ $$\large{ h }$$ = Planck constant (reduced) $$\large{\frac{lbf-ft}{sec}}$$ $$\large{J-s}$$ $$\large{ c }$$ = speed of light in vacuum $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$