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Model scale & fit calculator

Scale a model uniformly by target size, percent or scale ratio and check its rectangular printer-volume fit. Review the method, a worked example and the limits before using your result.

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Model Scale & Fit Calculator

Set a target size, convert a scale ratio, or check your build volume.

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Calculator inputs and result

Editable example values. Replace them with your own measurements.

For a 1:72 model, enter 72.

Your result

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Enter your values to calculate.

Calculation details
Detailed calculation
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Bounding-box estimate for a rectangular usable build volume. Checks fixed orientation or 90° axis turns only. Supports, brim, clips, toolhead clearance and arbitrary rotations are not calculated.

Build volume & orientation

Applied to both ends of X, Y and Z, including below and above the bounding box.

Settings & draft

Edits can be saved in this tab. Device saving is optional.

How to use

  1. Enter the model’s current X, Y and Z bounding dimensions. Choose a target X, scale percentage, scale-ratio change or maximum-fit calculation.
  2. If checking fit, enter the printer’s usable rectangular X, Y and Z dimensions and the chosen clearance.
  3. Choose fixed XYZ orientation or allow the six axis permutations produced by 90-degree rotations.
  4. Review all scaled dimensions and the selected orientation. The plan diagram shows X/Y, while Z is checked numerically.

Calculation method

Uniform scaling multiplies all model dimensions by one factor. Target-X mode divides target X by original X. A move from scale 1:N to 1:M uses factor N/M. For a fixed orientation, maximum fit is the smallest available printer-axis size divided by its corresponding model dimension, after subtracting clearance from both ends of each axis. Permutation mode compares the six axis assignments and selects the best supported rectangular fit.

Worked example

A 100 × 60 × 40 mm model scaled to X = 150 mm uses a factor of 1.5, giving 150 × 90 × 60 mm. Changing a 1:72 model to 1:48 also gives 72/48 = 1.5. In a 220 × 220 × 250 mm volume with 5 mm clearance at both ends of each axis, fixed orientation fits at 210%; allowed axis permutations can reach 240%.

Assumptions and limits

The tool handles uniform bounding-box scaling, not STL analysis, arbitrary-angle orientation, nesting, support placement or dimensional compensation. Clearance also applies below and above Z in this explicit model. Circular beds, clips, forbidden regions, head collisions, brim, supports and actual printable geometry need a slicer check. A box that fits is not necessarily a printable part.

Continue your plan

Re-slice the scaled model before using its new inputs in the printing cost calculator, filament check or flow calculation.

Copy, download or print a valid result to keep the inputs with the estimate. Currency selections label your prices; they do not apply an exchange rate. Product-dependent examples should be replaced with data for the material or equipment you actually use.

For the measurement and planning details, read scaling a model and checking rectangular build-volume fit.