How do I calculate the area of a rectangle?

Enter the length and width in meters, then click Calculate. The tool computes area = length × width, perimeter = 2 × (length + width), and diagonal = √(length² + width²).

Is this calculator free?

Yes, completely free. No registration or download needed. All calculations run locally in your browser.

Rectangle Area Calculator

Enter length and width to accurately calculate area, perimeter, and diagonal length. Perfect for room measurement, furniture planning, land area estimation, and everyday geometry tasks with instant results.

Length (m)

Width (m)

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📊 Result Chart

About Rectangle Area Calculator

Free online rectangle area calculator. Enter length and width to accurately calculate area, perimeter, and diagonal length. Perfect for room measurement, furniture planning, land area estimation, and everyday geometry tasks with instant results.

Rectangle Area Calculator in 3 steps

Enter the length in meters (e.g. 5)
Enter the width in meters (e.g. 3)
Click Calculate to see area, perimeter, and diagonal

What is Rectangle Area Calculator?

Rectangle Area Calculator is a free online tool that runs entirely in your browser. No download or signup needed — enter Length and Width to get results instantly. All data is processed locally.

Use Cases

Calculate floor area for room measurement
Plan furniture layout in a space
Estimate land area for gardening or construction
Quick geometry calculations for homework

Key Features

Completely Free: No registration, no limits
Privacy Safe: Data never leaves your browser
Cross-Platform: Any modern browser
Zero Dependencies: Open and use