Model Scale Percentage Calculator
Get the exact percentage to resize a model to the size you need — or apply a percentage to see the finished dimension. It also shows how much the material use changes, which grows faster than you'd think.
Measure the same feature on both — height, width, or length. Any unit works as long as both match.
Enter the percentage you plan to type into your slicer to see the resulting size.
Formula & how it works
Scale percentage is target ÷ current × 100, and the scale factor is that divided by 100. Applying a percentage reverses it: current × percentage ÷ 100.
Because scaling is uniform in three dimensions, volume — and therefore material — changes by the factor cubed.
Worked example
A figure is 50 mm tall and you want it 75 mm. That is 75 ÷ 50 × 100 = 150%, a factor of 1.5. Every dimension grows by half, but the material use grows by 1.5³ = 3.375 — more than triple. Scaling down to 80% instead gives a factor of 0.8 and about half the material, at 0.512.
Scaling with your eyes open
Percentage is per-axis, material is per-volume
The number your slicer wants is the linear percentage — how much longer, wider, and taller. It is easy to forget that filling that larger shape takes far more plastic or resin, because volume rises with the cube. A model at 200% is not twice the print, it is roughly eight times, with matching print time.
Watch the details when you shrink
Scaling down shrinks wall thickness, small pins, and text at the same rate. Below a certain size those features drop under your nozzle width or your resin's resolution and simply vanish or fail. If a downscaled part has thin walls, thicken them in your slicer or model rather than trusting the raw percentage.
Fit and clearances move too
Holes, pegs, and tolerances all scale with the model, so a scaled part may no longer mate with hardware or other prints sized for the original. When a specific dimension has to stay fixed — a bolt hole, a snap fit — scale the model, then correct that feature back to its target rather than accepting the scaled value.