CAD Drawing Fit Calculator
Check whether a real drawing width and height will fit the selected paper and margins at a specific CAD scale before creating or changing a viewport.
Enter your values, then select Calculate.
Runs in your browser. No calculation data is sent to an external service.
What this calculator does
The calculator converts the real extents to plotted size at 1:N, compares them with the available paper rectangle, and reports the exact minimum ratio required if the requested scale is too large.
Example
A 50 m × 30 m drawing at 1:100 needs 500 × 300 mm of paper. That fits inside an A1 landscape printable area of 821 × 574 mm with 10 mm margins.
How to use the result
- Enter the extents of the content that actually needs to appear, not the infinite model workspace.
- Leave extra room for dimensions, notes, legends and title-block information.
- If a scale barely fits geometrically, the Best Scale Calculator can suggest the next safer standard scale.
Frequently asked questions
What does minimum exact ratio mean?
It is the smallest denominator that would make the drawing extents fit the available rectangle exactly.
Should I use that exact odd ratio in a production viewport?
Usually not. Choose the next appropriate standard scale unless the project explicitly uses custom scales.
Does the calculator include annotation space?
No. It checks geometry extents. Leave additional room for dimensions, labels, legends and other sheet content.
Explore more in CAD Plotting Tools & Calculators.