Rectangle Calculator

Rectangle Area Calculator
Enter length and width to calculate rectangle area and perimeter in seconds. View results and the Area = Length × Width formula to size projects.
Rectangle Diagonal Calculator
Enter a rectangle's length and width to instantly compute the diagonal using the Pythagorean theorem—handy for geometry, DIY, and construction.
Rectangle Perimeter Calculator
Enter length and width to instantly calculate a rectangle’s perimeter using P = 2(l + w). See the result and your inputs displayed for quick reference.
Rectangle Width Calculator
Rectangle Width Calculator
Rectangle Angle Calculator
Calculate rectangle angles easily with length and width input. Determine interior angles of rectangles for precise geometry calculations and design projects.
Rectangle Length Calculator
Rectangle Length Calculator