Square Footage Calculator

Getting an accurate total area for the rooms in your home is the foundation of any renovation budget. The number drives how much material you order, how labor is estimated, and how much room you leave in your overall spending plan. With construction costs continuing to shift through 2026, knowing your true square footage before you commit to anything keeps a project on solid financial footing.

Each room you enter is measured on its own and then added to the running total. Rectangular spaces are handled by multiplying length by width, while irregular layouts are split into simpler shapes such as rectangles and triangles, with each piece calculated separately and summed. To estimate renovation cost, the tool multiplies your total square footage by whatever cost-per-square-foot figure you supply.

Measuring twice before you order anything is the surest way to avoid the expense of buying too much or too little material. Odd spaces like bay windows and alcoves are easy to overlook, yet they add up. Treat any cost-per-square-foot figure as an average, since real prices swing with material grade, labor rates, and how involved the work is. Setting aside a contingency of 10-20% gives you cushion when surprises appear, as they usually do.