The blood glucose monitoring (BGM) techniques were invasive, require a blood sample of the diabetic patient that creates the risk of infection. It was very essential to avoid complications arising due to abnormal blood glucose levels in diabetic patients. This paved the proposed system developed a non -invasive monitoring technique. In this paper, the blood glucose level is noninvasively measured by passing the suitable wavelength of red laser light through human finger. The 650nm wavelength of red laser was passed to the human finger, analyze the transmitted and absorbed blood samples to determine the glucose level (mg/lit). In this proposed method, the mathematical equation was used to calculate the glucose level from the obtained voltage level. The corresponding values were investigated to determine the glucose level in blood. The hardware implementation of this blood glucose monitoring device was designed and the glucose level was calculated by the mathematical equations. The blood glucose level for both invasive and the noninvasive method had been recorded and glucose level was calculated using the formula.Error % = IV (mg/dL) – NIV (mg/dL) X 100/IV (mg/dL)