Work out scale factor instantly with clear inputs, formula shown and shareable results.
The scale factor is the ratio of a new length to the corresponding original length. Areas scale by k² and volumes by k³, because area involves two length dimensions and volume three.
Scale factor
k = new length / original length, area × k², volume × k³
The scale factor is 2.5, so areas grow 6.25× and volumes 15.625×.
A reduction. A factor of 0.5 halves every length and quarters every area.