Dimensional & Scale Calculator
Turn a target dimension, model scale or percentage into a precise resize factor. Resize X, Y and Z proportionally and convert common length units locally.
ONE FACTOR, EVERY AXIS
Preserve the proportions.
Dimension factor = target length ÷ original length after both are converted to the same unit. Resize percentage = factor × 100. Each output axis = original axis × factor, converted to the output unit.
Example: 100 mm → 125 mm gives a factor of 1.25, or 125%. A 100 × 40 × 20 mm model becomes 125 × 50 × 25 mm.
Unit conversion uses exact international definitions: 1 inch = 25.4 mm, 1 foot = 304.8 mm, and 1 yard = 914.4 mm. Metric units use powers of ten.
MODEL SCALE
From one scale to another.
For an original scale A:B and target scale C:D, factor = (C ÷ D) ÷ (A ÷ B). Moving from 1:64 to 1:43 enlarges the model: 64 ÷ 43 ≈ 1.48837209, or 148.837209%.
The percentage is a length multiplier. Area and volume change by the square and cube of that factor; this calculator resizes lengths only. Check printer limits and clearances before printing a scaled part.