# Planck Energy

Written by Jerry Ratzlaff on . Posted in Relativity

## Planck Energy Formula

 $$\large{ E_p = m_p\;c^2 }$$

### Where:

 Units English SI $$\large{ E_p }$$ = Planck energy $$\large{lbf-ft}$$ $$\large{J}$$ $$\large{ m_p }$$ = Planck mass $$\large{lbm}$$ $$\large{kg}$$ $$\large{ c }$$ = speed of light in vacuum $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$