Print Resolution Calculator
Find the largest print you can make from an image's pixel dimensions at a chosen resolution (PPI/DPI), in inches and centimeters.
Last updated: October 2026
Maximum print size
13.33 × 10 in (33.9 × 25.4 cm) at 300 PPI
Formula below · 2 sources (dpreview.com, kenrockwell.com) · Updated Oct 2026
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About this calculator
A print's size is its pixel count divided by the print resolution, in pixels per inch (PPI; print labs often call it DPI):
print width (in) = image width (px) ÷ PPI print height (in) = image height (px) ÷ PPI
Multiply inches by 2.54 for centimeters. The chart under the result draws the print to scale and gives its area.
Which resolution?
300 PPI is the usual target for photos looked at up close, in an album or a small frame. Larger prints are seen from farther away, so they need fewer pixels per inch to look sharp: around 150 to 200 PPI for wall prints and less for posters seen from across a room. A rough rule from visual acuity (about one arc-minute) is that a print viewed from 12 inches needs about 300 PPI, and the needed resolution halves each time the viewing distance doubles.
If the print size you want has a different shape from the image (for example 8 × 10 from a 3:2 photo), part of the image is cropped, so check the size against the shorter dimension.
How to use
Enter the image's width and height in pixels (shown in your photo app's file info) and the resolution you want to print at. Example (the defaults): a 4000 × 3000 pixel image (12 megapixels) at 300 PPI prints at 4000 ÷ 300 = 13.33 by 3000 ÷ 300 = 10 inches, or 33.9 × 25.4 cm. A 6000 × 4000 image (24 megapixels) prints 20 × 13.33 inches at 300 PPI, or 40 × 26.67 inches at 150 PPI for a wall print.
Frequently asked questions
What DPI should I use for printing photographs?
It depends on viewing distance, not just image content. The classic rule of 300 DPI applies to prints viewed at 10–14 inches (photo books, fine art held close, magazines). For prints hung on a wall and typically viewed from 3+ feet, 150 DPI produces results indistinguishable from 300 DPI to most viewers. Posters viewed from 5+ feet work at 100–120 DPI. Outdoor billboards viewed from 30+ feet work at 25–50 DPI. The human eye resolves roughly 1 arc-minute of angular detail; the math is approximately DPI = 1 / (tan(0.0003) × viewingDistance × inches/foot). For everyday photo printing labs like Costco, Walgreens, or Bay Photo, 300 DPI is the safe target. For commercial billboards and trade-show banners, work with the print vendor to learn their preferred resolution — pushing pixels beyond what the medium can resolve wastes file size and time.
How does the print resolution differ from camera megapixels?
Megapixels describe total pixel count regardless of distribution; print resolution depends on how those pixels are distributed across the printed dimensions. A 24-megapixel sensor (6000 × 4000 pixels) prints differently than a 24-megapixel medium format sensor (5328 × 4500 pixels) because the aspect ratios differ. To compare: divide pixel dimensions by target DPI to get inches; a 6000×4000 image prints 20×13.3 inches at 300 DPI, a 5328×4500 image prints 17.8×15 inches at 300 DPI — same megapixel count, very different print shapes. Sensor size affects image quality (full-frame vs APS-C noise, dynamic range) but not directly print resolution; megapixel count drives print size. For maximum flexibility, modern 45–60 MP sensors (Sony A7R V, Canon R5, Nikon Z9, Fuji GFX) allow prints up to 30×20 inches at native 300 DPI without upscaling.
Can I upscale a low-resolution image for a larger print?
Yes, modern AI upscaling tools (Topaz Gigapixel AI, Adobe Super Resolution in Camera Raw, ON1 Resize) extend usable print size 1.5–2× beyond native resolution while maintaining acceptable quality. The mechanism: neural networks trained on millions of images predict plausible high-frequency detail (texture, edges, fine patterns) when scaling up — much better than the older bicubic or Lanczos interpolation which simply blurs details. Practical guidance: a 12 MP phone photo can credibly print 24×16 inches with AI upscaling at 150 DPI viewing distance. Limits: AI upscaling cannot recover detail that was never captured (motion blur, severe defocus, low-light noise blocks). Best results come from already-sharp source images that were just lower-resolution. For maximum quality prints (museum, fine-art collector market), shoot with the right resolution camera rather than relying on upscaling; for everyday use, AI upscaling is genuinely useful and often impossible to distinguish from native resolution by the print viewer.
What are the most common mistakes when sizing prints?
The biggest is applying the 300 DPI rule universally without considering viewing distance; a 4×6 foot wall canvas does not need 300 DPI because nobody views it from 12 inches. The second is ignoring aspect ratio mismatch between image and frame, leading to forced cropping that ruins composition; check that 3:2 photos go in 3:2 frames (4×6, 8×12, 16×24) and 4:3 photos in 4:3 frames (8×10, 12×15). The third is using JPEG files saved with high compression for fine-art prints; JPEG artifacts become visible at print sizes that hide them on screen. The fourth is forgetting to apply output sharpening optimized for print (different from screen sharpening); printed images look softer than screen because ink dots bleed slightly, requiring more aggressive sharpening pass before printing. The fifth is misunderstanding color profiles; printing an sRGB file on a printer expecting Adobe RGB produces dull colors. The sixth is using monitor preview to judge print quality without a calibrated monitor and soft proofing; uncalibrated monitors lie about brightness, contrast, and color. The seventh is ordering prints without printer-specific test prints first; every print lab has slight color and brightness biases that you discover only by printing a calibrated test image once.
When should I not rely on this calculator?
Skip it for vector and text-heavy graphics (logos, posters with large type, technical drawings) where DPI does not apply the same way; vector files scale infinitely. It is the wrong tool for screen output (web, social media, presentations) where pixel dimensions and PPI (pixels per inch of display) matter but DPI as a print metric does not — design for the device, not for print DPI. Do not use it for commercial offset printing where line-screen frequency (LPI) and dot gain matter more than DPI; the relevant rule there is roughly DPI = 2 × LPI (300 DPI matches 150 LPI offset printing). For variable-data printing and labels, follow the print provider's specific resolution requirements. For high-end fine-art reproductions of paintings (where you photograph the original and reproduce at scale), use the conservation-photography workflow with calibrated lighting and color targets, not generic DPI math. And for projection (slideshows, gallery digital displays), use the projector's native resolution rather than print DPI — projecting a 300 DPI file at 1920×1080 wastes the file's information without improving displayed quality.
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