Rectangle and Square Calculator
Calculate area, perimeter, diagonal, and dimensions of rectangles and squares
About this calculator
The Rectangle and Square Calculator is a versatile tool that instantly computes area, perimeter, diagonal length, and missing dimensions for rectangles and squares. Whether you're working on construction projects, home renovations, crafts, or homework assignments, this calculator eliminates manual calculations and reduces errors. Simply input known measurements like length, width, area, or perimeter, and the calculator automatically determines all other properties. It's essential for students, professionals, DIY enthusiasts, and anyone needing quick geometric calculations.
How to use
Enter any two known values such as length and width, or area and one dimension. The calculator will automatically compute all remaining properties including area, perimeter, diagonal, and missing dimensions. For squares, you only need one measurement since all sides are equal. Results are displayed instantly with precise calculations.
Frequently asked questions
What's the difference between calculating rectangles and squares?
Squares have all equal sides, so you only need one measurement. Rectangles have different length and width values, requiring two dimensions for complete calculations.
Can I find dimensions if I only know the area?
For rectangles, you need area plus one dimension to find the other. For squares, area alone is sufficient to calculate all properties.
How is the diagonal calculated?
The diagonal is calculated using the Pythagorean theorem: diagonal = √(length² + width²). For squares, it's side length × √2.