Paper size is not model-space size
An A3 PDF may show a component at 1:1, a floor plan at 1:100 or a site plan at 1:500. PDF coordinates describe the printed page. Without a scale note or known measurement, the intended real size cannot be known reliably.
Calculate the scale factor
If a wall should be 6,000 mm but measures 60 units, the scale factor is 100. Scale the complete drawing by 100.
Verify more than one dimension
Check a second horizontal and vertical distance. If only one direction is correct, the image may be stretched. Uniform scaling cannot repair different X and Y distortion.
Common scale problems
- The PDF was printed using “fit to page”.
- A scan was resized after scanning.
- Different viewports use different scales.
- Millimetres and inches were confused.
- No readable dimension is available.
What to provide
Select the known scale during upload. If it is unknown, provide one real measurement. For multi-sheet files, mention whether every page uses the same scale.
Final check
Confirm insertion units and important dimensions before using converted geometry for engineering, quantities or fabrication.
Convert with a known scale
Enter the scale under Advanced settings when it is shown in the title block.
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