Standard scales
Pick a common scale, from 1:20 to 1:2500, matching the plan’s title block.
Measure PDF plans: scale, distances and areas.
3PDF puts measurement where the plan is read: calibrate the scale, then take distances and areas directly on the page — no export, no CAD software, no leaving the document. Built for architects, surveyors, contractors and quantity surveyors.
Calibrate the scale
Custom ratio
The plan was shrunk at print time or scanned at an unknown size? Define a free ratio from a known dimension.
Measure right on the page
Once the scale is set, take distances and areas on the document itself. The traditional detour — export the plan, open another application, measure again — disappears: you stay inside the PDF.
Worth knowing
- The scale is entered manually: measurement reliability depends on the calibration and the quality of the plan.
- Measurements are indicative — they do not replace a certified survey.
- Plan measurements are part of the Pro version, at €3.99 a month.
Check a measurement before using it
- Check a known dimension after choosing the scale.
- Verify the scale on each page if the file contains several plans.
- A resized, distorted or scanned plan may need a custom ratio.
- Keep units and measurement context when sharing the result.
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