Aspect ratio & print size calculator
For digital downloads and print-on-demand: simplify your file's ratio, scale it without distortion, and see how big it actually prints.
Your file
| Aspect ratio | – |
|---|---|
| Orientation | – |
Scale without distortion
| Resulting height | – |
|---|
Print size
| Prints at (inches) | – |
|---|---|
| Prints at (cm) | – |
300 DPI is the usual print-shop standard; 150 DPI still looks fine on a wall from normal viewing distance.
Notes
- Cropping to a standard frame size changes the ratio — check what gets cut before you export.
- "Prints sharp" here means at least the required pixel count at the chosen DPI; the printer's own quality still applies.
How to use — step by step
For digital downloads and print-on-demand: know your file's ratio, scale it without distortion, and see how big it actually prints.
- Enter the pixel dimensions of your file — width and height.
- Read the simplified aspect ratio (3000×2400 is 5:4) and the orientation.
- To resize proportionally, enter a target width — the matching height appears instantly.
- Set your print DPI (300 is the print-shop standard; 150 is acceptable for wall pieces viewed from a distance) and read the physical size in inches and centimeters.
- Check the paper table: it lists common sizes (5×7, 8×10, A4, Letter, A3) and whether your file covers each sharply — or exactly how many pixels each needs.
How it works
Ratios simplify by dividing both dimensions by their greatest common divisor, so 3000×2400 collapses to 5:4 rather than the meaningless 625:500. Scaling keeps that ratio: height = target width × original height ÷ original width — the arithmetic that prevents the squashed-print listing photo.
Print size is pixels ÷ DPI: 3000 px at 300 DPI is a 10-inch print. The paper table inverts the question — for each standard size it computes the required pixels (8×10 inches at 300 DPI needs 2400×3000) and compares against your file, so 'prints sharp' is a pixel count, not a vibe. The 150-DPI guidance exists because wall art is judged at arm's length plus; fine detail matters less than composition at that distance.
One trap the numbers expose: cropping to a standard frame size changes the ratio. A 4:5 file cropped to 8×10 inches (4:5, fine) but cropped to A4 (~1:1.41) loses inches of artwork — check before you export.
Screen and feed ratios are worth memorizing: 1:1 for grid posts, 4:5 for feed images that want maximum vertical space, 16:9 for video thumbnails, 2:3 and ISO paper (1:1.414) for print. When a platform asks for 2700×2025, that's 4:3-ish — check what your file simplifies to before assuming it fits. And note DPI is a print concept only: a digital file has no DPI until it's printed; the same 3000-px file is both a 10-inch print at 300 DPI and a screen image of whatever physical size the screen has.
Frequently asked questions
Is 150 DPI really acceptable?
For wall art viewed from a meter or more, yes — the eye can't resolve the difference at that distance. For hand-held items (cards, zines), stay at 300.
What ratio are Etsy listing photos?
Etsy recommends around 5:4 (2700×2025 px typical) for listing images. Digital files themselves can be any ratio — this is about the photos.
Why doesn't my ratio show as small numbers?
Very wide ratios (banners, panoramic prints) simplify to unwieldy pairs, so the tool shows the decimal ratio like 2.353 : 1 instead — same meaning.
Can I upscale a small file to print big?
The tool shows what's needed; upscaling adds pixels but not detail. For prints beyond your file's coverage, re-export from the original design at higher resolution.
What are the most common ratios I should keep in mind?
1:1 square, 4:5 portrait feed, 16:9 widescreen, 2:3 photo print, 3:2 classic photo, and 1:1.414 for A-series paper. Enter any of these as pixel pairs and the tool confirms your file matches.
Does DPI matter for digital-only downloads?
No — DPI prints nothing. A 3000-px file is 3000 px on any screen. DPI only becomes real the moment ink meets paper.
How exact must the paper fit be?
Within a few percent is visually fine for wall art; the table's 'needs X×Y px' line tells you the shortfall so you can re-export rather than guess.