The smart LPG scale is specially designed for households in Hong Kong. It can monitor the remaining capacity of LPG, prevent gas shortage, and determine whether there is any abnormal situation in the LPG tank. LPG contractors, can also track LPG tanks and notify customers that they need to be replaced with new LPG due to low remaining capacity and whether there is any abnormality. They can also avoid the occurrence of abandoned gas tanks. Especially for the elderly living alone, it can reduce the pressure of safety and run out of LPG without warning.