Measurements

Calibrating Scale and Measuring Drawings

Calibration tells ContractorCounter how drawing pixels map to real project dimensions. Once calibrated, measurement markups calculate lengths, areas, perimeters, and volumes from the drawing geometry.

Updated 2026-06-12 · 6 min read

Calibrated measurement workflow
Drawing A-101.pdf
100%FitExport

12.40 m

Pick a known dimension, enter its real size, then measure directly on the drawing with calibrated tools.

Calibrate the page

  1. 1

    Find a known dimension

    Use a labelled wall, grid line, door width, scale bar, or other dimension printed on the drawing.

  2. 2

    Open calibration

    Choose Set Scale from the drawing toolbar, then click the two endpoints of the known distance.

  3. 3

    Enter the real length

    Type the real-world length and unit shown on the drawing. ContractorCounter applies the scale to measurements on that page.

Measure length, area, or volume

  1. 1

    Choose a measurement tool

    Select distance, area, perimeter, or volume measurement from the toolbar.

  2. 2

    Trace the object

    Click the endpoints or boundary points on the drawing. Complete polygon-style measurements by closing the shape.

  3. 3

    Review the value

    The measured value appears on the markup and in measurement-aware panels. Editing the geometry recalculates the quantity.

When to recalibrate

Recalibrate if the page scale changes, the drawing was scanned at the wrong size, or one PDF contains pages with different sheet sizes or drawing scales.

Related topics

Related product guides

These broader guides explain how this support workflow fits ContractorCounter's markup, measurement, takeoff, and export toolset.

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