This book gives an insight into design of VLSI architectures for floating point arthimetic units using reversible logic for low power applications. Chapter 1 briefs the significance of reversible logic. Chapter 2 discusses various approaches in design of reversible arithmetic circuits. Chapter 3 describes the realization of basic gates in reversible logic. ASIC design of reversible floating point adder is discussed in chapter 4. In Chapter 5 ASIC design of reversible floating point multiplier is deliberated. Finally, chapter 6 concludes the work.