Floor area calculator.

Add the rectangles that make up your floor.

Use one rectangle for a rectangular room. For an L-shaped space or several rooms, add separate rectangles that do not overlap. Include each floor area once.

How to use this square footage calculator.

1. Measure each rectangle. Check the length and width in the same unit system. For feet and inches, divide the inches by 12 and add the whole feet.
2. Keep sections separate. Split an L-shaped outline into non-overlapping rectangles. A closet or alcove can be another section if it is part of the floor you want to count.
3. Enter all dimensions. Every section needs a length and a width greater than zero. Remove a section you do not need.
4. Calculate and review. Check the section breakdown as well as the total. Changing measurements clears the previous result until you calculate again.

This tool calculates from numbers you enter; it does not measure a room through your camera. It handles rectangles and shapes that can be divided into rectangles. Curves, diagonal edges and other shapes need a different geometry calculation or a correctly captured room outline.

Worked example: an L-shaped room.

Divide this illustrative room into two rectangles: section A is 12 ft × 10 ft and section B is 6 ft × 4 ft. The sections meet at an edge; their areas do not overlap.

Trying the example replaces any measurements currently entered.

Convert square feet to square yards or square meters.

Square feet to square yards: divide the square-foot area by 9. A square yard measures 3 ft by 3 ft, so it contains 9 sq ft. For example, 144 ÷ 9 = 16 sq yd.

Square feet to square meters: multiply by 0.09290304. For example, 144 sq ft × 0.09290304 = 13.37803776 sq m, displayed here as 13.38 sq m.

Square meters to square feet: divide by 0.09290304. Keep the full value through your calculation, then round the final displayed result. A length conversion is different from an area conversion: do not divide square feet by 3 to obtain square yards.

Floor area is not the same as a flooring or carpet order.

This floor area calculator gives the horizontal area of the rectangles you enter. It does not add cutting waste, spare material, package rounding, a carpet seam plan or a product-specific allowance.

For carpet, roll width, room layout, pile direction, seams and cuts can make the required order larger than the net square footage. Converting that area to square yards does not solve the roll layout. Follow the carpet measurement guide and review the proposed layout with your supplier or installer.

For planks, tiles and other flooring, check the layout, manufacturer’s instructions, cuts and pack size separately. See how to measure a room for flooring. Coatings also require their own coverage and substrate checks; a floor-area result is not an automatic epoxy, paint or material quantity.