Rectangle Calculator
Calculate rectangle area, perimeter, diagonal, and missing dimensions
About this calculator
The Rectangle Calculator is a comprehensive tool that helps you calculate all essential rectangle measurements including area, perimeter, diagonal length, and missing dimensions. Whether you're working on home improvement projects, academic assignments, or professional design work, this calculator eliminates manual computation errors and saves valuable time. Simply input any two known values, and the calculator instantly determines all remaining rectangle properties using standard geometric formulas.
How to use
Enter any two known rectangle measurements such as length, width, area, perimeter, or diagonal into the input fields. The calculator will automatically compute all remaining values using geometric relationships. For missing dimensions, input the known measurements and the calculator will solve for the unknown sides instantly.
Frequently asked questions
What measurements can I calculate with this rectangle calculator?
You can calculate area, perimeter, diagonal length, length, and width. Input any two known values to find all remaining measurements automatically.
Can I find missing rectangle dimensions if I only know the area?
You need at least two known values to calculate missing dimensions. Area alone isn't sufficient - you'll also need length, width, perimeter, or diagonal.
What's the difference between area and perimeter of a rectangle?
Area measures the space inside the rectangle (length × width), while perimeter measures the distance around the outside edges (2 × length + 2 × width).