How to Measure PDF Area with Cutouts and Depth

Set the scale for the exact page before tracing. Use a scale printed in the title block only when you know the PDF still has that plotted relationship; otherwise calibrate by drawing over a long, known dimension and verify a second span. PolyPDF stores the calibration per page, and an uncalibrated page reports square PDF points rather than pretending it knows real-world square feet or square metres.

Next decide the boundary convention. Gross floor area, finish area, slab area, roof membrane, paving, and paint coverage can use different faces and exclusions even on the same plan. Put that meaning in the Subject and project notes. Software can calculate the geometry you trace, but it cannot decide which side of a wall belongs in your scope.

• Use a long calibration reference and snapped endpoints where the PDF contains vector linework.
• Check a second known dimension before tracing a large or commercially significant area.
• Create a Scale Region when a detail on the page uses a different scale from the main view.
• State whether the boundary is gross, net, centerline, inside face, outside face, or another project convention.

1. Choose the Area measurement tool.
2. Click each meaningful turn around the outer boundary. Zoom in for short offsets and crowded corners.
3. Close the figure at the starting point after at least three vertices.
4. Select the completed area and inspect its handles against the intended boundary.
5. Set the Subject and Status so the Takeoff Worksheet explains what the quantity represents.
6. If the real boundary is intentionally curved, choose the Curved path option and verify the displayed curve follows it.

For a straight path, the area follows the polygon formed by the vertices. When the area path is set to Curved, PolyPDF 1.4.0 uses the displayed smoothed boundary in its area calculation rather than measuring only the straight chords between control points. Use the mode that matches the actual edge, not the one that merely looks cleaner.

Avoid self-intersecting boundaries and unnecessary points. A clean outline is easier to audit and less likely to hide a misplaced segment.

With the area selected, find Area Cutouts in the style controls and choose Add Cutout. Trace the first opening as a closed polygon. PolyPDF checks each cutout vertex against the stored straight outer control polygon and warns when a vertex falls outside it. That check does not prove that every connecting edge stays inside a concave outline, and a curved visible boundary can differ from the stored control polygon, so inspect the entire cutout at high zoom. Repeat Add Cutout for additional voids. The selected annotation shows the number of stored cutouts, and Remove Last removes the most recently added one.

• Use cutouts for actual exclusions such as shafts, courtyards, large penetrations, or openings required by your scope.
• Keep cutouts wholly inside the outer boundary and inspect them at high zoom before accepting the total.
• Do not overlap cutouts. PolyPDF subtracts each stored polygon; overlapping rings can subtract the shared portion more than once.
• Do not use a cutout as a visual mask for an uncertain scope item. Record the decision and its basis.

The example above uses one curved outer boundary and two closed cutouts. The Records panel shows a net result of 28,793.49 sq ft, with both openings already subtracted. Your own totals depend on the drawing you start from, the scale you set for that page, and the boundary you decide to trace.

Review the annotated page as well as the total. A correct formula cannot detect that an opening was traced twice, that the wrong stair was excluded, or that the outer boundary followed the wrong face of wall.

A selected area measurement exposes a Depth field. Enter a positive real-world length in the current measurement format—for example, 4 inches, 0.1 metres, or 1 foot 6 inches. PolyPDF multiplies the net area by that depth and changes the worksheet quantity kind from Area to Volume. Clear the field to return to an area quantity.

Depth is a typed uniform value, not a third dimension detected from the drawing. Do not use one depth where the assembly varies without a documented averaging method. If multiple zones have different thicknesses, create separate area measurements so each volume has an explicit boundary, Subject, and depth.

PolyPDF requires a real-world page or region scale before accepting depth. That prevents an entered depth from being combined with an uncalibrated area to produce a misleading volume.

The Hatch controls set the pattern, colour, opacity, and scale used to draw the annotation. Increasing hatch scale changes the spacing or size of the pattern; it does not change the outer geometry, the cutouts, the net area, or the depth. The example above uses a diagonal crosshatch at 110 percent so the two cutouts stay easy to see.

Use a hatch that makes the included region and excluded openings easy to inspect at the zoom and print size reviewers will use. A decorative pattern should never obscure the very boundary it is meant to explain.

• Calibration converts PDF geometry; it cannot repair nonuniform scan distortion, perspective, or a warped original.
• A net-area total is only as defensible as its source revision, boundary convention, scale verification, and cutout review.
• CSV or PDF export preserves the calculated records, not the reasoning behind an undocumented scope decision.
• The free edition allows up to three hand-created measurements per document. Symbol Search is a separate PolyPDF Pro workflow in the current release.

A measurement is only as accurate as the drawing it is traced on, the calibration set for that page, and the boundary you chose. PolyPDF calculates the geometry you give it; deciding what belongs inside the boundary stays with you.