Square Footage Calculator

Square Footage Calculator is a free browser tool for DIY room measurement and flooring purchase planning. Enter feet and inches or metric dimensions. Calculate rectangles, L-shaped rooms, circles and triangles; add or subtract rectangular sections and combine up to 20 rooms. The flooring calculator separates net area, waste allowance, whole-box rounding, spare boxes and optional costs. Copy or print results without an account. Measurements stay in the current browser tab and are lost on refresh. Use the result as a planning estimate, recheck actual dimensions, and follow the flooring manufacturer's product instructions before ordering. It does not provide certified property measurements or optimize carpet roll cuts.