Documentation

Measure Toolbar

Calibrate drawing scale and run linear, area, radius, diameter, angle, polylength, and count measurements on PDFs.

Measure Toolbar

Measurement tools for quantifying distances, areas, and counts on scaled drawings. Enable via View → Toolbars → Measure. Once the page scale is calibrated, every measurement is labelled in real-world units — Figure 1 shows several linear dimensions on a calibrated sheet.

A calibrated drawing sheet with several linear measurements drawn on it — each a dimension line with end ticks and a white-backed label showing the distance in feet — beside the Measure toolbar docked at the top of the workspace.
Figure 1. Linear measurements on a calibrated sheet: each dimension line carries its real-world length. The Measure toolbar also covers area, count, radius, diameter, angle, and polylength.

Calibrate

Before measuring, calibrate the drawing scale:

  1. Click Calibrate.
  2. Drag a line over a known dimension on the drawing (e.g., a wall labelled "10 m").
  3. A dialog asks for the real-world length and unit (m, ft, mm, etc.).
  4. The px-per-unit ratio is stored and used by all measurement tools.
Tip: Calibrate separately for each PDF if drawings use different scales. The calibration is stored per-session.

Linear Measure

Drag between two points. A line with a distance label appears. If calibrated, the label shows the real-world measurement (e.g., "4.75 m"). If not calibrated, it shows pixels.

Area Measure

Click to add polygon vertices; double-click or press Enter to close. The enclosed area is calculated using the Shoelace formula and displayed as a label in the centroid of the polygon. Unit is m² or ft² depending on calibration.

Count

Each click places a numbered circle marker. All markers are auto-numbered sequentially. The total count is shown in the toolbar. Useful for counting fixtures, columns, or equipment items.

Radius

Click centre point, then click edge point of a circle. Displays the radius measurement with an R prefix. Works with calibrated scale.

Diameter

Click two opposite points on a circle. Displays the diameter measurement with a Ø prefix. More accurate than measuring radius × 2 for existing circles.

Angle

Click vertex point, then click first arm point, then click second arm point. Displays the interior angle in degrees. Useful for checking wall angles or roof pitches.

Polylength

Click to add multiple vertices along a path; double-click or press Enter to finish. Calculates the total length of all segments combined. Ideal for measuring continuous runs like cable trays or piping.

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