What is preserved
The calculator keeps width, height, and depth in the same proportion.
Free · No signup · Browser-local
STL Scale Calculator
Calculate the exact uniform percentage before scaling a model in a slicer or editor.
Uniform scale · Browser-local
Calculate uniform scale
50.00%50.00 × 25.00 × 12.50 mm
What can be lost or unsupported
- No file is modified or downloaded
- Units must be consistent
- The result does not validate printer tolerances
Common uses
- Find slicer scale percentage
- Fit within a printer build volume
- Preserve aspect ratio across dimensions
Frequently asked questions
Are my files uploaded?
No. Model parsing, preview, and export run in your browser.
Is the conversion lossless?
No format conversion is described as lossless. Review the format-specific warnings above before using the output.
What is the file-size limit?
100 MB is a safety ceiling, not a guarantee. Mobile devices may need substantially smaller files.