Measurements
Setting Drawing Scale
Scale calibration is required before distance, area, perimeter, and volume tools will measure — they stay locked on an uncalibrated page. Scale is stored per page, so each sheet can carry its own calibration.
Updated 2026-07-03 · 5 min read
12.40 m
Use a known dimension on the page, then enter the real value and unit.
Calibrate with a known length
- 1
Open the drawing
Choose the PDF page that contains a reliable labelled dimension or scale bar.
- 2
Select Set Scale
Choose Set Scale from the toolbar or press S.
- 3
Pick endpoints
Click the two endpoints of the known distance as accurately as possible — zoom in first for long dimensions.
- 4
Enter the real length
Enter the printed real-world value and unit (m, mm, ft, in, or any unit you work in), then save the calibration.
Check the result
- 1
Measure a second known dimension
Use Measure Distance (M) on another labelled item to confirm the calibration.
- 2
Recalibrate if needed
If the check value is wrong, repeat calibration using a longer, clearer known dimension.
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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