Guides · Floor Plan Measurement
Measuring a floor plan used to mean graph paper, a ruler, and a lot of manual math. Today you can upload any to-scale floor plan — from a CubiCasa export, a Matterport schematic, or a scanned appraiser sketch — and get accurate square footage in under two minutes. Here is exactly how.
Two things: a to-scale floor plan image and at least one known measurement from it. The image can be JPG, PNG, HEIC, or PDF. The measurement can be any labeled wall length, a standard door width (2'8" or 3'0"), or a room dimension from permit records. Without a scale reference the tool will still work, but you need at least one known real-world length to calibrate.
Go to MeasureFloorPlan.com and drag your floor plan onto the upload area, or click to browse. JPG, PNG, HEIC, and PDF all work. For PDF uploads the tool renders the first page at high resolution — if your plan spans multiple pages, extract just the floor plan page first. Higher resolution always gives cleaner traces. Use the original PDF rather than a screenshot of it when possible.
Once the image loads, click around the exterior walls of the area you want to measure. Each click places a point; the tool draws lines between them. Double-click to close the polygon. For GLA, trace only the above-grade, finished, heated living space — exclude the garage, unheated porches, and any below-grade area. For a two-story home, trace each floor as a separate polygon; the tool sums them. Zoom in before clicking corners for maximum precision.
This is the most important step. Click two points along any wall where you know the real-world length, then type that distance. The tool recalibrates all polygon areas instantly. Use the longest known dimension available — a 40-foot exterior wall is far better than a 3-foot door opening. A longer reference minimizes the impact of any click-placement imprecision. See floor plan scale explained for more detail.
After calibration, each polygon shows its area. For multi-floor homes all polygons sum to a running total. Add separate polygons for any additional areas you want measured (detached garage, finished basement). The total above-grade finished polygons give you GLA under ANSI Z765 methodology.
JPG and PNG are the most common. PDF works excellently for CubiCasa, Matterport, Apex Sketch, and architect drawings. HEIC (iPhone photos) is supported natively. Avoid very low-resolution scans under 72 DPI — lines become too blurry for accurate tracing. For more detail on PDF uploads see PDF floor plan measurement.
Including the garage: Not GLA. Trace it separately if you want the area, but exclude from your GLA total. Short scale reference: A 2-foot door calibration amplifies error; use the longest wall you can find. Tracing interior walls: GLA is measured exterior-to-exterior under ANSI Z765. Interior traces undercount by total exterior wall thickness. Screenshot vs original PDF: Screenshots compress the image. Upload the original PDF when possible.
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