Three calculators for re-scaling STLs and miniatures: ratio-to-ratio, measurement-to-measurement, and a full source-to-target dimensions tool. Slicer-ready factor and percentage, with the formula shown so you can sanity-check the maths.
Convert an STL from one scale ratio to another. Enter source and target ratios; get the slicer-ready factor and percentage.
Convert a known measurement to a target measurement and get the scale factor and percentage change. Great for resizing minis to a specific height.
Convert a known measurement at a known scale into a measurement at a desired scale. Mix and match units (mm / cm / m / in / ft) on either side.