Square Footage Calculator

Area from length and width in square feet or square meters.

Square Footage Calculator helps you area from length and width in square feet or square meters. Enter length and width, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Square Footage calculator does Square Footage Calculator is built for materials, areas, volumes, and jobsite estimates. Area from length and width in square feet or square meters. You enter length and width, then Simple Calculators computes the result instantly. Formulas match common contractor and DIY references for rectangular and simple shapes. How the math works Pick Units, then enter the Length and Width in feet or meters. Area = length × width, so a 12 × 10 ft room is 120 square feet. The calculator also gives the perimeter (distance around the edge), the diagonal, and the area in square meters, square yards and acres. It assumes a rectangle. The formula: Area = length × width. Measure both sides in feet (answer in ft²) or both in meters (answer in m²).