Image Size Calculator: DPI, Pixels & Print Dimensions

Calculate exact pixel dimensions for any print size and DPI. Determine file sizes, convert between units, and find the perfect resolution for print, web, and social media. Free, instant, free to use.

Common Print Sizes Reference

• 4 x 6 inches (standard photo): 1200 x 1800 px at 300 DPI
• 5 x 7 inches (greeting card): 1500 x 2100 px at 300 DPI
• 8 x 10 inches (portrait): 2400 x 3000 px at 300 DPI
• 11 x 14 inches (large print): 3300 x 4200 px at 300 DPI
• 16 x 20 inches (poster): 4800 x 6000 px at 300 DPI
• 24 x 36 inches (large poster): 3600 x 5400 px at 150 DPI
• A4 (210 x 297mm): 2480 x 3508 px at 300 DPI
• A3 (297 x 420mm): 3508 x 4961 px at 300 DPI

DPI Guide by Use Case

• 72 DPI: Web and screen display only
• 150 DPI: Large format prints, posters, banners (viewed from 3+ feet)
• 300 DPI: Professional photo prints, magazines, brochures, business cards
• 600 DPI: Fine art prints, detailed illustrations, text-heavy documents

Frequently Asked Questions

What DPI do I need for printing?

For high-quality photo prints, use 300 DPI. For large format prints viewed from a distance (posters, banners), 150 DPI is usually sufficient. For billboards and very large signage, 72 DPI can work since they are viewed from far away. Screen display only requires 72-96 DPI.

How do I calculate pixel dimensions for a specific print size?

Multiply the desired print size in inches by the DPI. For example, an 8x10 inch print at 300 DPI requires 2400 x 3000 pixels. Our calculator does this math automatically for any combination of size and DPI.

What is the difference between DPI and PPI?

DPI (dots per inch) refers to the physical dots a printer places on paper. PPI (pixels per inch) refers to the pixel density on a digital screen. In practice, they are used interchangeably when discussing image resolution requirements. Our calculator works for both contexts.

How large can I print an AI-generated image?

ZSky AI generates images up to 2048x2048 pixels standard, with HD upscaling available for larger dimensions. A 2048px image can print at 6.8 inches at 300 DPI or 13.7 inches at 150 DPI. Use our calculator to determine the maximum print size for any pixel dimension.