This calculator will compute all the resolutions that something can be scaled down in correctly. Put in the width and height of the original piece and its aspect ratio. Note this uses square pixels.
Back to homepage or the tutorial.
Working out resolutions up to 1280x720 with aspect ratio: 16:9
| Width | Height | % of original |
|---|---|---|
| 16 | 9 | 1.25 |
| 32 | 18 | 2.5 |
| 48 | 27 | 3.75 |
| 64 | 36 | 5 |
| 80 | 45 | 6.25 |
| 96 | 54 | 7.5 |
| 112 | 63 | 8.75 |
| 128 | 72 | 10 |
| 144 | 81 | 11.25 |
| 160 | 90 | 12.5 |
| 176 | 99 | 13.75 |
| 192 | 108 | 15 |
| 208 | 117 | 16.25 |
| 224 | 126 | 17.5 |
| 240 | 135 | 18.75 |
| 256 | 144 | 20 |
| 272 | 153 | 21.25 |
| 288 | 162 | 22.5 |
| 304 | 171 | 23.75 |
| 320 | 180 | 25 |
| 336 | 189 | 26.25 |
| 352 | 198 | 27.5 |
| 368 | 207 | 28.75 |
| 384 | 216 | 30 |
| 400 | 225 | 31.25 |
| 416 | 234 | 32.5 |
| 432 | 243 | 33.75 |
| 448 | 252 | 35 |
| 464 | 261 | 36.25 |
| 480 | 270 | 37.5 |
| 496 | 279 | 38.75 |
| 512 | 288 | 40 |
| 528 | 297 | 41.25 |
| 544 | 306 | 42.5 |
| 560 | 315 | 43.75 |
| 576 | 324 | 45 |
| 592 | 333 | 46.25 |
| 608 | 342 | 47.5 |
| 624 | 351 | 48.75 |
| 640 | 360 | 50 |
| 656 | 369 | 51.25 |
| 672 | 378 | 52.5 |
| 688 | 387 | 53.75 |
| 704 | 396 | 55 |
| 720 | 405 | 56.25 |
| 736 | 414 | 57.5 |
| 752 | 423 | 58.75 |
| 768 | 432 | 60 |
| 784 | 441 | 61.25 |
| 800 | 450 | 62.5 |
| 816 | 459 | 63.75 |
| 832 | 468 | 65 |
| 848 | 477 | 66.25 |
| 864 | 486 | 67.5 |
| 880 | 495 | 68.75 |
| 896 | 504 | 70 |
| 912 | 513 | 71.25 |
| 928 | 522 | 72.5 |
| 944 | 531 | 73.75 |
| 960 | 540 | 75 |
| 976 | 549 | 76.25 |
| 992 | 558 | 77.5 |
| 1008 | 567 | 78.75 |
| 1024 | 576 | 80 |
| 1040 | 585 | 81.25 |
| 1056 | 594 | 82.5 |
| 1072 | 603 | 83.75 |
| 1088 | 612 | 85 |
| 1104 | 621 | 86.25 |
| 1120 | 630 | 87.5 |
| 1136 | 639 | 88.75 |
| 1152 | 648 | 90 |
| 1168 | 657 | 91.25 |
| 1184 | 666 | 92.5 |
| 1200 | 675 | 93.75 |
| 1216 | 684 | 95 |
| 1232 | 693 | 96.25 |
| 1248 | 702 | 97.5 |
| 1264 | 711 | 98.75 |
| 1280 | 720 | 100 |