Draw the boundary first. In this example the main rectangle measures 12 ft by 10 ft, a triangular nook extends past one edge, and a 2 ft by 3 ft fixed cabinet sits inside the main rectangle. We are estimating only the area that will get flooring.
| Part | Calculation | Area |
|---|---|---|
| Main rectangle | 12 × 10 | 120 sq ft |
| Cabinet footprint to leave out | 2 × 3 | −6 sq ft |
| Triangular nook | 4 × 5 ÷ 2 | +10 sq ft |
| Total to cover | 120 − 6 + 10 | 124 sq ft |
The 5 ft measurement is the perpendicular distance from the triangle’s 4 ft base to the opposite point. Measuring the sloping side instead will usually overstate the height. Also make sure the nook is outside the rectangle in your sketch, or you will count part of the floor twice.
I work on the square footage calculator. To reproduce this example there, enter the main rectangle, add a 2 ft by 3 ft subtract section, and enter the nook as a second triangle. The measured total does not include any allowance for cuts or rounding to whole flooring boxes.
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