Ad aspect ratio calculator

Calculate a ratio and proportional size

Whole pixels, 1–100,000. Local calculation. No files are changed.

Try a common shape

These are dimension examples, not current placement specifications. Check the requirements of your intended destination before exporting.

Reduce the ratio, then choose the size

Divide width and height by their greatest common divisor. For 1080 by 1920, that divisor is 120, giving 9:16. A ratio describes shape. It does not specify resolution, file size or placement eligibility.

To keep that shape at a new width, calculate new height = new width × original height ÷ original width. Whole-pixel exports sometimes need rounding. The calculator tells you when it rounds the result.

Worked production examples

A portrait review copy

A 1080 × 1920 master is 9:16. At a width of 720 pixels, the matching height is 1280. This changes dimensions while keeping the shape.

A product photograph

A 4032 × 3024 photograph is 4:3. At a width of 1080 pixels, it becomes 1080 × 810. The same proportions do not guarantee that small text on the product will stay readable.

A rounded export

A 1000 × 667 source at 720 pixels wide gives 480.24 pixels high. The whole-pixel output is 720 × 480, so its shape changes slightly through rounding.

Recognize 4:3, 4:5, 9:16 and 1920 × 1080

Divide width and height by the same number to reduce a ratio. The following are arithmetic examples for planning creative dimensions, not a platform placement specification or a promise that the file’s content will fit.

1. 1600 × 1200 reduces to 4:3. At 1080 pixels wide, the same shape is 1080 × 810. 1080 × 1350 reduces to 4:5. At 720 pixels wide, it becomes 720 × 900.
2. 1080 × 1920 reduces to 9:16. At 720 pixels wide, it becomes 720 × 1280. 1920 × 1080 reduces to 16:9. At 1280 pixels wide, it becomes 1280 × 720.
3. Changing dimensions proportionally keeps the shape. Changing 16:9 into 9:16 needs a separate crop or layout decision in your editing tool. This calculator does not accept or resize uploaded video.

Resizing and reframing answer different questions

Resizing keeps the same shape. Moving a 9:16 concept into a 4:5 frame requires a layout decision. You can leave space around the full creative, create a separate composition or crop your own footage after checking what the crop removes.

Give the editor the original size, the exports you need and anything that must stay in frame. Check the finished files before uploading them. The calculator gives you the dimensions, but you still need to check the product and text.

Keep the reference beside the brief

Use Barry to collect the ad references behind your production decisions. Save a selected set to a named board with Pro and share it alongside your brief on desktop. The calculator works locally and does not resize, upload or save a creative.