Standard Digital Rock Physics (DRP) is a newly developed method for characterizing physical parameters of rock. In this method, 3D micro-CT images from a small sample is used which does not cover macro structures of rock. Increasing sample size needs a huge amont of memory for both storage and numerical compuations. To overcome this isse, a multiscal approach is introdced in this paper. In the proposed method, a low-resolotion 3D image and several high-resolution 2D images are used. To determine elstic moduli of low-resolotion image those trends such as bound wighted average and differential effective medium models obtained from high-resolotion images are used. To evaluate this method, the Grosmont carbonate was applied. Results showed an accurate computation even with high differences between reolutions of scales.