Today, IOT (Internet of Things or Internet of Objects) is popular upcoming topic in Wireless network and in Wireless Network. Localization has become a crucial factor for various monitoring applications such as search, rescue, disaster relief, target tracking etc. Various WSN localization technologies are designed for calculating location of the unknown node. IOT is a latest approach where it combines many technologies, such as network technology, communication technology, database technology (Internet, Bluetooth, infrared, Wi-Fi, GPRS, 3G, SQL, etc) to provide location based service which enables different ways to obtain the location information of various objects. In this paper, we focus on to achieve higher localization accuracy based on services in which we deploy sensing devices to calculate the information of sensor nodes and its surrounding nodes where it requires less hardware and less implementation, To improve the localization accuracy, we propose a Weighted Centroid based on IOT mechanism capable to give accurate calculation between Anchor node and Unknown node.