For source width W, source height H, and target ratio R:
- source ratio = W ÷ H;
- if the source is wider than R, keep full height and estimate width as H × R;
- if the source is taller than R, keep full width and estimate height as W ÷ R;
- retained area = (crop width × crop height) ÷ (W × H);
- scaled height = desired width ÷ R, or scaled width = desired height × R.
Calculations keep full precision. Displayed pixel dimensions are rounded to the nearest whole pixel, so their displayed ratio can differ slightly from the mathematical target.
| Source image | Target ratio | Estimated centered crop | What is removed | Area removed |
|---|
| 3000 × 2250 | 4:3 | 3000 × 2250 | Nothing | 0% |
| 3000 × 2000 | 4:3 | about 2667 × 2000 | about 333 px total width | about 11.1% |
| 2400 × 3000 | 4:3 | 2400 × 1800 | about 1200 px total height | 40% |
| 2000 × 2000 | 3:4 | 1500 × 2000 | about 500 px total width | 25% |
Examples assume a centered crop and do not predict which pixels Etsy will show.