Present disclosure relates to a system for calculating ECG. The system at least includes a first obtaining device, a second obtaining device, a third obtaining device and a mobile device. Each of the obtaining devices includes a first electrode, a second electrode and a processor. The three obtaining devices are placed on three limbs of a user respectively. The three obtaining devices are configured to obtain three sets of voltage variations between each two of the three limbs and record three time stamps corresponding to the obtainment. The three sets of voltage variations and three time stamps are sent to the mobile device. The mobile device is configured to calculate a substantially synchronized three leads ECG according to the three sets of voltage variations and the three time stamps.本案係一種心電圖計算系統,至少包含行動裝置以及第一至第三擷取裝置,第一至第三擷取裝置各自具有第一及第二電極元件和處理器。第一至第三擷取裝置三者相互耦接並設置於使用者肢體的第一至第三部份,第一至第三擷取裝置用以獲取使用者肢體兩兩之間的第一至第三電位差,並同時記錄對應獲取第一至第三電位差時間的第一至第三時間戳。第一至第三擷取裝置將第一至第三電位差及第一至第三時間戳傳輸至行動裝置,由行動裝置根據第一至第三電位差及第一至第三時間戳產生趨近同步的三導程心電圖資訊。301‧‧‧第一擷取裝置302‧‧‧第二擷取裝置303‧‧‧第三擷取裝置304‧‧‧第四擷取裝置305‧‧‧第五擷取裝置306‧‧‧第六擷取裝置307‧‧‧第七擷取裝置308‧‧‧第八擷取裝置309‧‧‧第九擷取裝置400‧‧‧整合貼片組
