DPI / PPI Print Resolution Calculator
Calculate physical print size in inches and cm from pixel dimensions at 300, 240, 150, and 72 DPI with paper size compatibility.
1. Image Dimensions (Pixels)
2. Target Print Density (DPI / PPI)
30.48 cm × 20.32 cm (at 300 DPI)
Print Size Across Common Densities
| Resolution | Print Size (Inches) | Print Size (cm) | Intended Viewing Distance |
|---|
Standard Paper Compatibility (At 300 DPI)
About this tool
How to use it
- Enter the image's pixel width and height, or select a common camera or video preset (such as 24MP DSLR or 4K UHD).
- Select your target print density (standard 300 DPI for photos, 150 DPI for posters, or custom).
- Choose the expected viewing distance (handheld, arm's length, or wall poster) to calculate eye resolution thresholds.
- Click Calculate Print Size to reveal maximum physical inches and centimeters, aspect ratio, and paper size compatibility.
Why it matters
Printing digital images without matching pixel dimensions to print resolution results in blurry, pixelated prints or unexpectedly tiny output. Understanding the mathematical relationship between pixels, dots per inch (DPI), and human visual acuity ensures prints look tack-sharp without overspending on unnecessarily high image resolutions.
When to use it
Use this calculator before ordering canvas photo prints, preparing posters for print shops, sizing artwork for framing, or designing client marketing collateral across A4, A3, and custom poster sizes.
Good to know
300 DPI is the universal benchmark for close-up print inspection (magazines and photo albums). For large wall art viewed from several feet away, 150 to 200 DPI is visually indistinguishable to the human eye due to optical angular resolution.
Common questions
What is the difference between DPI and PPI?
PPI (Pixels Per Inch) measures digital display and image sensor density. DPI (Dots Per Inch) describes the physical ink droplets laid down by a printer. In digital photo prep, the terms are used interchangeably to indicate how many digital pixels span one inch of printed paper.
Why is 300 DPI considered the photo print standard?
At standard arm's length reading distance (10 to 14 inches), the resolving limit of normal 20/20 human vision is roughly 300 lines per inch (1 arcminute). Printing beyond 300 DPI provides diminishing visual returns for the naked human eye.
Can I print a poster at less than 300 DPI?
Yes. Posters viewed from 4 to 5 feet away look crisp at 150 DPI, and billboard graphics viewed from 15+ feet away are routinely printed at 30 to 72 DPI because greater viewing distance reduces the angular resolution requirement.
How many megapixels do I need to print an A4 or 8x10 photo?
An 8x10 inch photo at 300 DPI requires 2400 x 3000 pixels (~7.2 megapixels). An A4 page (8.27 x 11.69 inches) at 300 DPI requires 2480 x 3508 pixels (~8.7 megapixels).