Total Square Footage Calculator
Sum multiple area measurements into a single total. Add as many segments as needed - rooms, floors, separate buildings, or different shapes.
Total Area Calculator
When you need a total
Material orders for a whole home (carpet for every room, paint for every wall) need a single total. Property valuations need the sum of all heated finished space. Real estate listings need the total under-roof living area.
Always keep the individual numbers - if there's a measurement question later, you can recheck the specific room without re-measuring everything.
Combining different shapes
The multi-segment calculator handles different shapes per segment. You can have 5 rectangular rooms + 1 circular gazebo + 1 triangular bay - the total adds them all together correctly.
For mixed projects (like flooring + paint together), keep separate totals for each project type. Floor area and wall area aren't interchangeable, even though they're both "square footage".
Three definitions of 'total square footage'
Living area total (residential, ANSI Z765): sum of heated, finished, above-grade rooms. Closets and hallways count. Garages and unfinished basements don't.
Building area total (architectural): sum of all enclosed spaces of all stories, including walls, columns, mechanical rooms.
Project area total (renovation): sum of the rooms you're actually working on. May or may not include the whole house.
Always clarify which 'total' before quoting numbers. A 'total square footage' that includes a 600 sq ft finished basement and a 400 sq ft garage can be 1,000 sq ft higher than the same total measured by ANSI Z765 (above-grade living area only).
Worked example: 4-bedroom house. Above-grade living: 1,800 sq ft. Finished basement: 600 sq ft. Garage: 400 sq ft. Total can be 1,800, 2,400, or 2,800 depending on which definition.
Summing multiple rooms for a project
For projects spanning multiple rooms, the math depends on whether rooms get the same treatment.
Same flooring throughout: sum all room square footages, apply one waste factor, order from one dye lot.
Different flooring per room: calculate each separately, apply each room's own waste factor.
Paint with consistent color: sum all wall square footages, calculate total gallons.
Mixed projects (some rooms tile, some carpet, some hardwood): make a table — one row per room, one column per material.
Worked example, whole-home flooring: living (300) + dining (150) + hallway (80) = 530 sq ft hardwood. Master bedroom (240) + bedroom 2 (140) = 380 sq ft carpet. Master bath (80) + powder (30) = 110 sq ft tile. Order each material group separately with its own waste factor.
Multi-floor totals
For multi-story buildings, calculate each floor separately and sum. A two-story house with matching 1,000 sq ft footprint = 2,000 sq ft total above-grade living area.
Many houses have varying floor plates — bigger ground floor with smaller upper floor, or vice versa. Measure each floor independently.
Stair openings: count toward the floor below (the open space is part of the lower floor's ceiling, not the upper floor).
Mezzanines and partial floors: count actual floor area, not full floor.
Basement: include if heated/finished (some definitions); always report separately for real estate.
Pro tips
Save your sketches
A photo of your hand-drawn floor plan with measurements is invaluable for future projects. Don't throw it away after one job.
Sum types, not totals
Don't add floor area to wall area into a single "total". They're different surfaces and different material types. Keep separate totals.
Print the result
Use the Print button on the multi-shape calculator to print your full segment list and totals. Useful for bid comparisons and material orders.
Round at the end
Don't round each segment to whole sq ft - you accumulate error. Carry one decimal place per segment, then round the final total.