Rectangle Calculator

Calculate area, perimeter, and diagonal of a rectangle.

Unit of Measurement

Length

Width

Preview

Coursera Holi Offer

Build your AI fluency and get more done, faster. Get the AI skills employers are looking for and create 20+ solutions you can use at work, right away.

Start Learning

Area

0 cm²

A = l × w = 8 × 5 = 0

Perimeter

0 cm

2(l + w)

Diagonal

0 cm

√(l² + w²)

Documentation

Understanding Rectangles

A rectangle is a 4-sided polygon with opposite sides equal and all angles 90°. Area = l×w, Perimeter = 2(l+w).

Area

Perimeter

Diagonal

Frequently Asked Questions