Quantum Dot Cellular Automata (QCA) is an emerging nanotechnology in the field of Quantum electronics for the low power consumption and high speed of operational phenomenon. Such type of circuit can be used in many digital applications where CMOS circuits cannot be used due to high leakage and low switching speed. The code converters are the basic units for conversion of data to perform arithmetic operations. A new effective binary to BCD converter design using QuantumDot Cellular Automata is presented in this paper. Compared to the available code converters in VLSI technology, this method of using Quantum dots reduces area and increases switching speed. 3-input Majority gate is the basic and universal gate in QCA design. In accordance with the code converter design using 3-input majority gate logic, a 5-input majority gate logic structure is also used here to design the binary to gray code converter. This replacement improves the speed of the system by reducing number of clock cycles required to produce the output. The simulations are done using Xilinx ISE Design suite to get power and timing analysis.