Area of Rectangle Calculator

Find the area and perimeter of a rectangle.

Fill in the fields below to calculate

Length (l)

Width (w)

Enter your values above and tap Calculate to see the result.

Your Results

Area

Perimeter

Diagonal

Rectangle Formulas

Area: A = l × w

Perimeter: P = 2(l + w)

Diagonal: d = √(l² + w²)

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Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the area of rectangle figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.