Considering scarcity and high wage of labor, higher shattering loss, mechanized harvesting is crying need to be introduced as alternative of manual harvesting for rice and wheat in Bangladesh. This paper was carried out to compare the performance of manual reaper against manual harvesting method for rice and wheat. The selected field operations were done in several times to calculate the average performance. The operation time was recorded by stop watch. The actual field capacity and break-even point were calculated by using empirical equation. The average field capacity of manual reaper was 0.3482 ha/day for rice and 0.3236 ha/day for wheat with fuel consumption of 0.755 L petrol/h and 0.625 L petrol/h respectively. In manual harvesting, the average field capacity was 0.0312 ha/man-day and 0.0452 ha/man-day for rice and wheat respectively. It was revealed that using manual reaper, harvesting cost could be saved 58% for rice and 53% for wheat, consequently harvesting of selected crops by reaper was efficient than manual harvesting. It was also observed that if manual reaper works below break-even point 0.32 ha and 0.52 ha for rice and wheat respectively, it would not be economically feasible to farmers. Finally, manual reaper could be suggested as better mechanization for harvesting of rice and wheat, cultivated on fragmented lands.