An integrated circuit including a standard cell includes: a plurality of first wells extending in a first horizontal direction with a first width and of a first conductivity type; and a plurality of second wells extending in the first horizontal direction with a second width and having a second conductivity type, wherein the plurality of first wells and the plurality of second wells are alternately arranged in a second horizontal direction that is orthogonal to the first horizontal direction, and when m and n are integers greater than or equal to 3, the standard cell has a length in the second horizontal direction, the length being equal to a sum of m times a half of the first width and n times a half of the second width.