3D Scale & Fit Calculator
Scale models to a target size, convert percentages and model scales, calculate new X/Y/Z dimensions and find the largest uniform size that fits your build volume.
Original size → target size
Ideal when a part, helmet or figure must reach a specific dimension.
Scale by percentage or factor
Calculate the new bounding box. Optionally scale X, Y and Z independently.
Convert model scale 1:x
For figures, miniatures, dioramas and scale models, e.g. 1:6 to 1:10 or 1:12 to 1:8.
Fit model to build volume
Calculates the maximum uniform scale and automatically checks all six X/Y/Z orientations of the bounding box.
Model
Build volume
What the calculator also considers
Uniform scaling changes X, Y and Z by the same factor. Geometric volume scales with the cube of that factor: 150% means 3.375× theoretical volume. Real FDM filament use does not follow this exactly because walls, infill, top/bottom layers and supports do not scale in a purely volumetric way.
Build-volume fit is a bounding-box check
The fit mode tests orthogonal X/Y/Z axis permutations. It does not replace a slicer check for diagonally tilted models, toolhead clearance, exclusion zones, purge towers, brims or toolchanger clearance.
Use non-uniform scaling carefully
Different X/Y/Z percentages can be useful for costumes, molds or targeted tolerance corrections, but they also change proportions, hole geometry, wall thicknesses and mechanical fits.