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In this work, the design of a multi-planetary weight measurement device comprising of a hardware and software system, capable of measuring and displaying the weight of objects in different planets of our solar system is presented. It is a microcontroller-based device indigenously designed for computational astronomy needs in multi-planetary weight measurement. It is also a fascinating basic space science tool for space science enthusiasts. The methodology of the hardware design involved the programming and interconnection of modular electronic chips and sensors such as load cell sensor-TAS606, load cell amplifier-HX711, liquid crystal display-LCD, Joy-Stick switch and microcontroller which can measure weight of objects not exceeding five kilograms. The software system was designed into executable program using python programing language and can measure any range of object’s weight in the solar system. Surface gravity values for each planet were calculated and the respective values mapped for each select planet. Weight computational codes for respective planets were also developed in C-programming language for determining the weight of different objects on each planet. The device was calibrated using a known weight of one Kilogram (1Kg). Accurate weights of two different objects were measured for different planets on the system; the weights (data) measured were recorded and analyzed to show the key importance of gravity in astronomical weight computation in different planets.