Measure a rectangle and see all core dimensions from two side lengths.
Area-
Perimeter-
Diagonal-
Aspect ratio-
Method
Geometry formulas
Each result is calculated from the dimensions entered using standard Euclidean geometry formulas. The tool checks required constraints such as the triangle inequality and positive lengths.
Unless a unit is explicitly selected, lengths use any consistent unit, areas use its square, and volumes use its cube.
Questions
Rectangle Calculator FAQ
How do you find rectangle area?
Multiply length by width. The result uses square units matching the entered side unit.
How do you calculate the diagonal?
Use the Pythagorean theorem: diagonal equals the square root of length squared plus width squared.
