Lease Sukuk, as one of the modern Islamic financial instruments, play a key role in financing large and small projects in Islamic countries. This paper presents four practical formulas for pricing lease Sukuk by combining leasing models, conventional mortgage system and cost of capital in the framework of interest-free economy. The final formula is introduced as a hybrid model and is the result of combining three basic models and can be considered as the most comprehensive method for calculating lease Sukuk pricing. Using a statistical population including data related to lease bonds issued in Iran during the last Five years and key variables such as initial asset price, risk-free rate of return, asset growth rate, asset volatility and transaction costs and simulation in MATLAB. the results are presented in the form of tables and graphs. The findings show that the pricing of lease Sukuk, taking into account transaction costs such as intermediary fees, Sharia and operational costs, is very similar to the pricing of conventional Sukuk. This research, referring to all previous studies, also uses stochastic mathematics and Monte Carlo simulation, as well as pricing simulation in the form of two different scenarios, to present a proposed valuation model by considering changes in the price of the underlying asset and the interest rate proportional to the income and simulates it using a repurchase scenario with certainty (fixed price) and a repurchase scenario with the option to purchase (Brownian motion), and finally compares it with market prices.