Find the total square footage of one or many areas. Add each room or area, choose its shape, and the calculator totals the square feet. Add an optional price per square foot for a quick material cost.
| Area | Shape | Len/Base ft | Wid/Hgt ft | Dia ft | Sq Ft |
|---|
Square footage is area. For a rectangular room, multiply length by width. For a triangle, take one half of the base times the height. For a circle, use pi times the radius squared, where the radius is half the diameter. Add up every area to get the project total.
For irregular spaces, break the floor plan into simple rectangles, triangles and circles, calculate each, and sum them—exactly what the table above does when you add rows. To convert the total, divide by 9 for square yards or by 43,560 for acres. Multiply by a price per square foot to estimate flooring, paint or tile cost.
Use the square footage calculator to total rooms, work zones and irregular areas before estimating flooring, paint, tile, landscaping or other materials. It supports rectangles, triangles and circles in one table.
Start with the calculator that matches how your material is sold: area, length, volume, count, weight or electrical load. Enter one work area at a time, use the unit selector beside each measurement, then review the order quantity and cost fields before comparing supplier quotes.
Most calculators can save the current estimate in your browser, reload named estimates, print a copy, switch to dark mode or create a shareable link. Those tools are intended for planning and communication; always confirm final quantities, coverage rates, density, code requirements and pricing with the supplier or contractor responsible for the work.