DPI (Dots Per Inch) indicates how many dots of ink a printer places in one inch. Higher DPI produces sharper output. Common print values: 150, 300, 600.

DPI Calculator (Pixels per Inch / PPI)

Q: How many pixels per inch is 300 DPI?

300 DPI means 300 pixels per inch. A 10 x 8 inch photo printed at 300 DPI needs at least 3000 x 2400 pixels.

Q: How do I convert pixels to DPI?

DPI = pixels divided by print size in inches. Example: 1800 pixels over 6 inches = 300 DPI.

Q: How do I convert 72 pixels per inch to DPI?

72 pixels per inch equals 72 DPI. It is the legacy screen density; print usually needs 150 DPI or higher.

Q: How do I convert pixels to inches?

Divide pixels by DPI. At 300 DPI, 1500 pixels = 5 inches. At 72 DPI, 1500 pixels is about 20.8 inches.

Q: How do I convert DPI to PPI?

Numerically 1 DPI = 1 PPI. The label changes with context: printers report DPI, screens report PPI.

Convert between pixels, inches, and DPI (dots per inch) — also known as PPI (pixels per inch). Use it to verify print resolution (72, 96, 150, 300, 600 DPI) or calculate the pixel size your printer needs for a given paper size.

Enter image pixel dimensions and DPI to calculate the print size.

Width (px)

Height (px)

DPI

Enter print size (cm/inches) and DPI to calculate the required pixel count.

Width (cm)

Height (cm)

DPI

Calculate DPI from pixel count and print size.

Pixels

Print Size (cm)

Results are provided for reference only and may differ from actual values.

DPI / PPI Quick Reference

DPI	Typical Use	Notes
72 DPI	Web images, screen display	Legacy screen density; 72 pixels per inch
96 DPI	Windows default screen	Standard Windows DPI setting
150 DPI	Large posters, banners	Viewed from a distance, lower DPI is enough
300 DPI	Magazines, photo books, flyers	Industry standard for print
600 DPI	Fine art, small detailed prints	Premium quality; large file sizes

Formula: print_inches = pixels ÷ DPI. Example: 3000 px ÷ 300 DPI = 10 inches (25.4 cm).

When DPI Actually Matters — Print, Web, and Design

Printing Photos and Documents

Any time you send files to a print shop, 300 DPI at the final output size is the industry standard. Common photo sizes and the minimum pixels you need:

4×6 inch photo @ 300 DPI: 1200×1800 px (2.2 MP)
5×7 inch photo @ 300 DPI: 1500×2100 px (3.2 MP)
8×10 inch photo @ 300 DPI: 2400×3000 px (7.2 MP)
A4 document @ 300 DPI: 2480×3508 px (8.7 MP)
A3 poster @ 300 DPI: 3508×4961 px (17.4 MP)

If your source image has fewer pixels, the printer must upscale, which blurs detail and is visible to the eye. Any modern phone (12+ MP) handles up to A4 at 300 DPI without a problem.

Large Format — Posters, Banners, Billboards

Viewing distance matters. People look at a billboard from 30+ feet away, so 30 DPI is often enough. For a tradeshow banner viewed from 3–5 feet, 100–150 DPI is plenty. A ceiling-to-floor subway poster? 150 DPI. This is why you don't need a 100+ MP camera for large prints — viewing distance compensates.

Screens vs Print — The 72 DPI Myth

"Web images must be 72 DPI" is an old myth. Modern browsers ignore the DPI metadata entirely; only the pixel dimensions matter. A 1920×1080 image saved at 72 DPI and the same image at 300 DPI look identical on screen and have (almost) the same file size. The DPI number only matters when the image is printed. Feel free to ignore DPI when designing for the web.

High-DPI (Retina) Displays — PPI in Practice

Modern smartphones and laptops have PPI values above 300, making individual pixels invisible to the eye. Examples:

iPhone 15 Pro: 460 PPI
MacBook Pro 14" Retina: 254 PPI
Standard 27" 4K monitor: 163 PPI
Standard 27" 1080p monitor: 82 PPI

When designing apps or web pages, provide @2x or @3x image assets to keep detail sharp on Retina displays. A 100×100 icon should be exported at 200×200 or 300×300 to look crisp on high-DPI screens.

Quick Troubleshooting

Blurry print: Your image has too few pixels for the print size. Use the formula pixels = inches × 300 to check the minimum.
File size looks different at 72 vs 300 DPI: The pixel dimensions probably changed during resize. Check the actual pixel count, not the DPI label.
Photoshop "Image Size" and "Canvas Size" confusion: Image Size changes pixel count; Canvas Size changes the working area without resampling.

Frequently Asked Questions

Q. What is DPI?

DPI (Dots Per Inch) indicates how many dots of ink a printer can place in one inch. Higher DPI produces sharper printed output. Common print DPI values are 150, 300, and 600.

Q. What is PPI, and how is it different from DPI?

PPI (Pixels Per Inch) is the pixel density of a digital image or screen. DPI describes printed dots. Most image editors label their resolution setting as DPI even when technically it is PPI, so the two terms are often used interchangeably.

Q. How many pixels per inch is 300 DPI?

300 DPI means 300 pixels per inch. A 10 × 8 inch photo printed at 300 DPI needs at least 3000 × 2400 pixels.

Q. How do I convert pixels to DPI?

DPI depends on both pixel count and print size. Formula: DPI = pixels ÷ print size in inches. Example: 1800 pixels over 6 inches = 300 DPI.

Q. How do I convert 72 pixels per inch to DPI?

72 pixels per inch is 72 DPI — the terms map 1:1 in this context. 72 DPI is the classic web/screen density; print jobs usually need 150 DPI or higher.

Q. How do I convert pixels to inches?

Divide the pixel count by DPI. At 300 DPI: 1500 px = 5 inches. At 72 DPI: 1500 px ≈ 20.8 inches.

Q. How do I convert DPI to PPI?

For digital images they are numerically the same (1 DPI = 1 PPI). The label differs only by context: printers measure DPI, screens measure PPI.

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Disclaimer
Results are provided for reference only and may differ from actual values. This tool is for informational purposes and should not be used as a basis for legal, financial, or medical decisions.