Rectangle Area Calculator

Calculate the area, perimeter, and diagonal of a rectangle using length and width.

Length *

units

Width *

units

Output Unit

⚠️

Rectangle

—

📐

Rectangle Visualization

Graphical representation of your rectangle

—

📋

Calculation Breakdown

Step-by-step solution

📐

Area

—

L × W

📏

Perimeter

—

2(L + W)

📐

Diagonal

—

√(L² + W²)

✅

Valid Rectangle

✅ Yes

L > 0, W > 0

📖

Formula Reference

Rectangle formulas used

💡

Rectangle Tips

Understanding rectangles

📐 Mathematical Disclaimer: This calculator uses standard geometric formulas for rectangles. Ensure all inputs are positive numbers. A rectangle is a quadrilateral with four right angles.