In this work, we calculate the clumping factors of HII,HeII and HeIII in the IGM at various redshifts using a suite of Epoch of Reionization simulations. The Epoch of Reionization simulations were produced using Gadget and the ionizing radiative transfer performed using CRASH with the parameters calibrated to various observations at z~6. We also discuss the effect of environment on clumping factor calculations.