Square Footage Calculator

1. Choose a shape. Use the diagram to identify the dimensions you need. A square uses the rectangle mode with equal sides. If you already know an area, select Enter area directly and choose its area unit.
2. Enter your measurements. Feet and inches have separate fields. For example, 12 feet 6 inches is 12.5 feet, rather than 12.6 feet. Metric measurements can be entered in meters, centimeters or millimeters.
3. Combine sections. Add another area for each part of your space. Give it a name so you can check the breakdown. Use Quantity for sections with the same dimensions. Choose Subtract from total for a section you want to exclude.
4. Calculate and review. Check the added area, subtracted area and net total. You can enter a price per square foot, square yard or square meter to estimate cost. Recalculate after changing any input before copying or downloading your CSV.

An Example with Multiple Areas

Suppose a room has a 12 × 10 ft section and a separate 6 × 5 ft section. Their areas are 120 ft² and 30 ft². A 3 × 2 ft recess that you want to exclude subtracts 6 ft², giving a net area of 144 ft², or approximately 13.378 m². At a user-entered rate of USD 2.50 per ft², the estimate is USD 360.00. This price is an illustration, not a material quote.

Measure Irregular Spaces in Sections

An L-shaped room can be divided into two rectangles. Curved spaces may be easier to describe with circles, rings or sectors. Keep sections separate so they do not overlap. The calculator adds and subtracts the areas you enter; it has no coordinates and cannot check whether a deduction sits inside a room or has already been counted.

For triangles, trapezoids and parallelograms, height means the perpendicular distance, not the sloping edge. A rectangle border uses outside length and width with one uniform border width. A ring uses outside and inside diameters. For a sector, enter a radius and its central angle, choosing degrees or radians explicitly.

Area, Unit Conversion and Purchasing

Areas are converted to square meters before they are combined. One international foot is exactly 0.3048 meters, so one square foot equals 0.09290304 square meters. One square foot also contains 144 square inches. Displayed values are rounded for reading; cost calculations use the unrounded net area. The final estimated cost is rounded to the currency's minor unit, with halfway amounts rounded up.

The net area is geometric coverage, not a finished order quantity. Cutting, overlaps, spare material, package sizes and installation layouts can change how much material you need. Check those separately against the selected product. Measurements here also do not establish a property's official recorded floor area.