An Ex-post rate of return analysis for estimating the returns of BR11 variety of rice in T. Aman season has been conducted using Akino and Hayami model (1975) and Masters model (1996). Using the Akino and Hayami model it was found that the IRR to the total investment in BR11 rice variety research and extension was calculated at 85%. The increased production from BR11 saved foreign exchange of Tk. 109.83 billion, which is 86% of the total foreign exchange savings from HYV T. Aman rice. Under various assumptions of shift multiplier and expenditure, the magnitude of the IRR varies from 64 to 122%. Following the Masters model the magnitude of IRR was 102%. Under various assumptions of the proportional shift multiplier and expenditure, the magnitude of IRR varies between 79% to 126%. Therefore, the variety BR11 has proved to be as an outstanding contributing variety for increasing rice production in Bangladesh.