Architecture of one or more algorithms for autofitting objects with non-trivial geometries in documents. The algorithms autofit rectangular objects (such as floaters), when the objects contain both left and right aligned objects, autofit tables, determine correct sizes of a parent object and its child object when the width of the parent object is unknown (referred to as an auto-width), and the width of the parent's child object is expressed in percentages of the parent object width. A two-pass algorithm determines the best (or optimal) sizes of margins, borders, and paddings of objects where any combination thereof can have fixed width, auto width, and/or percentage-expressed width. Additionally, the algorithms can recursively calculate the optimal widths of objects inside other objects, where the outer object width is undefined. The algorithms can process an unlimited number of nesting levels.