Aspect Ratio Calculator

Change one dimension and let the other follow by the same factor. Halve the width and the height must halve too; multiply the width by 0.7 and the height goes the same way. That is the sum being done for you here — enter the size you have under Original, then the one figure you know under New, and its partner appears. The distortion people complain about comes from typing both new numbers by hand, or from dragging a corner handle without holding whatever key your editor uses to constrain proportions. Faces and circles betray it first; straight edges hide it well enough that a stretched image can ship.

Resizing changes pixel dimensions while keeping the shape. Changing the ratio changes the frame itself. Use Contain to keep the whole image and add padding, or Cover to fill the frame and crop the excess. The calculator reports the exact scaled dimensions and the padding or crop on each side; it does not alter the image file.

Rounding to whole pixels is unavoidable, since there is no such thing as two-thirds of a pixel, and the result sometimes lands odd. For a still image that is harmless. For video it often is not: most delivery codecs store colour at half resolution horizontally and vertically, so they want both dimensions divisible by two, and an encoder tends to refuse an odd one rather than fix it. Some workflows prefer multiples of eight or sixteen, to suit the blocks compression works in. Adjust by a pixel yourself before exporting — one pixel of shape error is invisible.

16:9 is standard landscape video and 9:16 is its vertical counterpart. Square posts use 1:1, portrait feeds commonly use 4:5, cameras often use 3:2 or 4:3, and cinema may use 2.39:1. All are available as source presets, but platform requirements still specify pixel dimensions as well as a ratio.

Cinema ratios are usually written as one decimal against one, and 1.85:1 and 2.39:1 are the two common projection formats. A decimal typed into the original boxes will not survive, because the pair is rounded to whole numbers before the ratio is reduced. Scale both sides up instead: for 2.39:1 enter 239 as the original width and 100 as the original height, and for 1.85:1 use 185 and 100. The proportion is identical and the arithmetic behaves. Put your intended width under New and the matching height appears.

Anamorphic footage stores a horizontally squeezed image and displays it wider. Choose Anamorphic and the lens factor used at capture. A 1920×1080 frame shot at 1.33× displays at about 2554×1080; a 2× squeeze displays at 3840×1080. The calculator changes dimensions only, not the video metadata or pixels.

Because 6×4 inches is 3:2 and most phones shoot 4:3, so something has to give — and a print lab crops rather than leave white edges, usually taking a slice off the long sides. The same collision runs through the standard sizes: 5×7 is 7:5, 8×10 is 4:5, and A-series paper is a proportion no camera shoots. Check what will be lost before ordering, because a head near the top edge is the usual casualty. Enter your image's pixel dimensions as the original pair and read the ratio line to see which print size it sits closest to.

No. Enter the width and height manually if you know them. The optional file picker reads an image's dimensions inside your browser and never uploads it. Calculated results have Copy buttons, and a reload clears the selected name and dimensions.