How do I calculate DPI?

Divide the image's pixel width by the print width in inches, and do the same for the height. The calculator works out both and shows the lower of the two, because the weaker side limits how sharp the print will be. For example, a 2,400 px wide image printed 8 inches wide is 300 DPI.

What DPI do I need for printing?

This calculator uses four tiers: 300 DPI and above is excellent (photo-print quality, sharp up close), 200–299 is good (sharp at normal viewing distance), 150–199 is fair (fine for posters and canvas viewed from a distance), and under 150 is poor (visibly soft up close).

How many pixels is 8×10 at 300 DPI?

2,400 × 3,000 pixels. That is 8 inches × 300 and 10 inches × 300. At 150 DPI the same print needs 1,200 × 1,500 pixels.

Does changing the DPI setting in my image file improve print quality?

No. For a given print size, only the number of pixels matters. Changing the DPI value in an image editor or in the file's metadata does not add detail. A 1,024 × 1,024 px image is about 102 DPI at 8×10 inches however the file is labelled. To get a higher DPI at that size you need more pixels, for example by upscaling.

What is the difference between DPI and PPI?

Strictly, PPI (pixels per inch) describes the pixels in your image file, while DPI (dots per inch) describes the ink dots a printer lays down. In print preparation, "300 DPI" almost always means 300 pixels per inch of the printed image, and that is what this calculator measures.

What is 150 DPI good for?

Large posters or canvas that people view from a distance. Many print-on-demand products, such as mugs, tote bags and t-shirts, accept images at around 150 DPI, though requirements vary by supplier. It will look soft if you hold a small print up close.

Can I use centimetres instead of inches?

Yes. Use the inches/cm toggle above the size table. It switches the wall-art table, the merch table and the custom size box. Note that if you switch units, re-enter your custom width and height in the new unit.

PDF, Images & Files

DPI / Print Size Calculator

Enter your image's pixel dimensions and see the DPI and print quality at every common print size, in inches or centimetres. Built with AI-generated art in mind, with one-tap presets for popular generators and sizes for mugs, shirts and other merch.

1. Your image's pixel dimensions

Quick-pick a common AI generator output size, or type your own.

Width (px)

Height (px)

2. What sizes can this print at?

Every common print/frame size, computed live from your pixel dimensions above.

Print size	Effective DPI	Quality

300+ — excellent, true photo-print quality 200–299 — good, sharp at normal viewing distance 150–199 — fair, fine for posters/canvas from a distance under 150 — soft/blurry up close, upscale first

3. What about merch — mugs, shirts, and other products?

Same idea, but sized to what print-on-demand sellers actually print on. Uses the same unit toggle above.

Product	Print area	Effective DPI	Quality

Read these badges a bit more leniently than the wall-art table above. Fabric, ceramic, and curved surfaces hide softness that would be obvious on a flat framed print, so a result that is "Poor" on wall art can still be fine here. Many print-on-demand suppliers accept around 150 DPI or above, but requirements vary, so check your supplier's guidelines.

4. Or check one custom size

Enter any exact print dimensions to get its DPI directly.

Width

Height

Result

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What DPI means for printing

DPI (dots per inch) is how many pixels of your image are packed into each inch of the printed result. Divide the pixel width by the print width in inches and you have the DPI. The same file can look sharp at 4×6 inches and soft at 24×36, because nothing about the file changes, only how far it is stretched. More pixels means you can print bigger at the same sharpness.

As a rule of thumb, 300 DPI is the target for prints viewed up close, and 150 DPI is often acceptable for large posters or canvas viewed from a distance. The calculator rates every size against those tiers (see "Reading the quality badges" below).

Why AI images need a DPI check

A photo from a 20-megapixel camera has plenty of pixels to work with, so it can print large and stay sharp. AI-generated images work differently. A generator hands you a fixed pixel size, often 1024×1024 or similar, regardless of how detailed the image looks on screen. That size is the ceiling on how big you can print before quality drops, which is why a DPI check matters more here than it does for a camera photo.

Reading the quality badges

Excellent (300+ DPI): true photo-print quality, sharp even held up close. The standard for framed wall art and fine art prints.
Good (200–299 DPI): looks sharp at normal viewing distance (arm's length or more). Fine for most everyday prints.
Fair (150–199 DPI): holds up for anything viewed from a bit of distance, like a large poster or canvas on a wall, but starts to soften up close.
Poor (under 150 DPI): visibly soft or blurry at that size. Either print smaller or upscale the image first.

Why merch gets more leeway than wall art

The same pixel count that reads as "Poor" on a framed 16×20 print can look fine on a coffee mug or t-shirt. Fabric weave, ceramic curvature, and the fact that nobody inspects a mug from six inches away all hide softness that would be obvious on flat, close-up wall art. The merch table uses the same badges as the wall-art table, so read them a little more leniently. Many print-on-demand suppliers accept images at around 150 DPI or above for these products, but requirements vary, so check your supplier's guidelines.

If your image comes up short

You have two options: pick a smaller size from the tables where the DPI lands in Good or Excellent territory, or upscale the image first. AI upscaling tools (such as Topaz Gigapixel, or the upscale step built into most generators) can multiply pixel dimensions with little visible quality loss, often enough to lift a "Poor" result to "Good" at the size you want. The custom size box shows the exact pixels you need for a true 300 DPI print.

Pixels needed for common print sizes

Print size	300 DPI (excellent)	150 DPI (fair, posters and canvas)
4 × 6 in	1,200 × 1,800	600 × 900
5 × 7 in	1,500 × 2,100	750 × 1,050
8 × 10 in	2,400 × 3,000	1,200 × 1,500
11 × 14 in	3,300 × 4,200	1,650 × 2,100
12 × 12 in	3,600 × 3,600	1,800 × 1,800
16 × 20 in	4,800 × 6,000	2,400 × 3,000
18 × 24 in	5,400 × 7,200	2,700 × 3,600
24 × 36 in	7,200 × 10,800	3,600 × 5,400
A4 (8.27 × 11.7 in)	2,481 × 3,510	1,241 × 1,755
A3 (11.7 × 16.5 in)	3,510 × 4,950	1,755 × 2,475

The custom size box above works this out for any size, in inches or centimetres.