Aspect Ratio Calculator for Images
Image ratio calculator for pixels: simplify width and height, resize proportionally, find target dimensions, and compare crop vs padding for 16:9, 4:5, 1:1, 3:2 and print ratios.
Ratio result
1920×1080px simplifies to 16:9 (16:9). Target 16:9. 1200px wide should be 675px high; 720px high should be 1280px wide. Crop fit 1920×1080; padding canvas 1920×1080.
- Crop fit removes pixels on the height axis.
- Padding fit preserves the full image and adds empty space on the height axis.
Common image ratios
Use this image ratio table before cropping artwork, product photos, thumbnails, printable files or social media exports. The same ratio can be scaled to any pixel size.
| Ratio | Example pixels | Common use |
|---|---|---|
| 1:1 | 1080 x 1080 | Square product photos, app icons, profile images and social posts. |
| 4:5 | 1080 x 1350 | Portrait social images and 8x10 print crops. |
| 3:2 | 3000 x 2000 | Camera photos, 4x6 prints and landscape artwork. |
| 2:3 | 2000 x 3000 | Portrait photos, 12x18 posters and printable wall art. |
| 16:9 | 1920 x 1080 | Video thumbnails, website hero images and widescreen canvases. |
| 9:16 | 1080 x 1920 | Short-form video covers, stories and vertical mobile images. |
How the aspect ratio math works
To simplify a pixel ratio, divide the image width and height by the largest number that divides both values. For example, 2400 x 3000 reduces to 4:5, and 3840 x 2160 reduces to 16:9.
For proportional resizing, keep the same ratio: new height = new width x ratio height / ratio width. If you know the target height instead, use new width = new height x ratio width / ratio height.
Use crop fit when the destination frame must be filled edge to edge. Use padding fit when the full image must stay visible, such as a product image, portrait, logo, printable artwork or cover design.
Check a YouTube thumbnail or convert print dimensions to pixels after choosing the ratio.
Image ratio calculator tasks
Use the calculator differently depending on whether you are identifying an existing image, resizing it, or deciding how it should fit a target frame.
| Task | Input to use | Result to copy |
|---|---|---|
| Find an image ratio from pixels | Enter the current width and height | Simplified ratio, decimal ratio and closest common ratio |
| Resize without distortion | Enter a target width or target height | Matching height or width that keeps the same proportion |
| Fit an image into a fixed frame | Choose 1:1, 4:5, 3:2, 2:3, 16:9 or 9:16 | Crop dimensions, padding canvas and percent of pixels affected |
| Prepare print or marketplace artwork | Compare the image ratio with the product, paper or social target | Whether to crop, pad or choose a different export size |
Aspect ratio formula examples
The simplified ratio is width divided by the greatest common divisor, followed by height divided by the same number. This keeps the proportion exact while making the ratio readable.
| Pixels | GCD | Ratio | Common use |
|---|---|---|---|
| 1920 x 1080 | 120 | 16:9 | Widescreen video, thumbnails and website media |
| 2400 x 3000 | 600 | 4:5 | 8x10 prints and portrait social crops |
| 3000 x 2000 | 1000 | 3:2 | Camera photos and 4x6 prints |
| 2000 x 3000 | 1000 | 2:3 | Portrait posters and printable wall art |
If a requested target ratio changes the image shape, do not stretch the file. Crop when edge loss is acceptable, or add padding when the full artwork, face, logo, product, or printable design must stay visible.
How to use this result
Start with the target surface: a printed size, a platform canvas, a marketplace image requirement, or a safe-zone overlay. Enter the real pixel dimensions or upload a local image when the tool supports it, then compare the result with the recommended size, ratio, file-size limit, and source note.
Use the copied output as a production checklist rather than as an approval guarantee. The calculator checks measurable dimensions and ratios, while final acceptance can still depend on compression, color, account settings, crop previews, platform policy, or printer-specific export instructions.
FAQ
How do I calculate aspect ratio from pixels?
Divide width and height by their greatest common divisor. A 1920 x 1080 image becomes 16:9.
Is image ratio the same as aspect ratio?
Yes. Image ratio usually means the same width-to-height proportion, such as 1:1, 4:5, 3:2, 2:3 or 16:9.
How do I resize an image without changing its ratio?
Enter either a target width or target height and use the matching dimension. Do not stretch both dimensions independently unless the image already matches the target ratio.
Should I crop or add padding?
Crop when losing edge pixels is acceptable. Add padding when the full image, product, face, logo or artwork must remain visible.
Can this resize my image?
No. It gives exact target dimensions and crop or padding guidance for your image editor.
Related tools
Sources and limits
Print formulas use standard inch, cm, mm and PPI conversions. Last checked 2026-05-24.
Platform dimensions are centralized in data files. Every platform spec must include sourceConfidence, sourceUrl and lastCheckedAt. Official platform documentation overrides this tool when specifications differ.