The constant volume method (CVM) is used to get the laminar burning velocity (LBV) at different pressures and temperatures from a single experiment. However, the LBV obtained using this method is not stretch-free. In the current numerical study, an effort is made to get the stretch-free LBV for hydrogen-air flames using CVM. CFD simulations of constant volume combustion in a spherical chamber was carried out for a H₂ + O₂ − diluent mixture using ANSYS Fluent^®, and the pressure-time and flame radius-time data obtained from the simulation have been used in the present work to determine LBV. A stretch-correction methodology is proposed, which requires the values of LBV with different stretch rates at a given target state (T, p) of the mixture, for extrapolating the LBV to zero stretch. This requires performing the simulations with different combinations of initial pressures and temperatures along the isentrope passing through the target state at which unstretched LBV is desired. From the computationally obtained