The Mantel Haenszel Method is a widely used method to calculate stratified summary effects. In this tutorial, a spreadsheet calculator is provided to calculate the summary effect from a group of studies. Ideal for a variety of study designs including RCTs. However, calculation of summary effect using the Mantel Haenszel Method needs a data matrix that can be entered into a 2*2 matrix. Besides, it cannot control for the effects of confounding factors.