How to Use the Square Footage Calculator
Enter a room's length and width for a simple rectangular room, or enter multiple sections for an irregular shape (as covered in the irregular-room guide) — the calculator totals the area, giving a figure ready to use for flooring, paint, or other material estimates, with a buffer added separately for cutting waste as needed.
The Square Footage Calculator handles both simple and irregular room shapes — here's how to use it correctly.
Entering dimensions for a simple room
For a straightforward rectangular room, entering length and width directly gives the total area — the most common and simplest use case for the calculator.
Splitting an irregular room into sections
For an irregularly shaped room, entering each rectangular section separately (as covered in the irregular-room guide) and letting the calculator sum them gives an accurate total, avoiding the overstatement that a single overall-dimension calculation would produce.