The screening current induced in rare-earth barium copper oxide (REBCO) tape generates an unwanted irregular magnetic field. The screening current-induced field (SCIF) is a challenging issue for MRI, NMR, and accelerators magnet composed of REBCO coils. A few FEM-based simulation methods have been proposed to estimate the SCIF; however, they require a long computation time.Recently, we have proposed a simple SCIF computation method based on the self and mutual inductances of REBCO pancake coil and screening current radial paths on the top and bottom of pancake coils. Accuracy of the proposed method is not excellent; however, computation time is quite short. In this paper, we report an equivalent circuit model that includes the self and mutual inductances of a REBCO pancake coil and screening current radial path. Moreover, with this proposed method, we can compute SCIF of no-insulation (NI) REBCO pancake coils, while it is not the case with the previously proposed FEM-based simulation method. The proposed method has been validated by experiment. The proposed method is available online.