Recently it receives a great attention to reduce road accident and controlling traffic by limiting the speed of vehicles. Moving vehicle speed is usually determined by using Radar, Photo Radar, Drone Radar, LIDAR Speedometer Clocks, Average Speed Computers, Aircraft or Video frame methods, etc. Most of these methods are very expensive and also their accuracy is not quite satisfactory. In this paper, a video based vehicle speed calculation method is presented, which has the capability of calculating the speed with higher accuracy but at relatively low cost. The method consists of three stages: object recognition, noise removal and speed calculation. The method shows satisfactory performance on standard data sets.