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The area of a logic circuit is the summation of individual areas of each gate of the circuit. Suppose a reversible circuit consists of n reversible gates. Area of those n gates are . Then by using above definition area, denoted by A, of that circuit is

The above definition for the area of a circuit can be calculated easily by obtaining area of each individual gate using CMOS 45 nm Open Cell Library and Synopsis Design Compiler.

Area of a gate can also be defined by the feature size. This size varies according to the number of quantum gates. As the basic quantum gates are fabricated with quantum dots with the size ranges from several to tens of nanometers ( m) in diameter, the size of the basic quantum gates ranges from 50–300 Å. Quantum circuits can be implemented with the basic quantum gates and the number of quantum gates depends on the number of basic quantum gates needed to implement it. So, the area of a gate can be defined as follows: Area = Number of quantum gates Size of basic quantum gates.