Pixels to Inches Calculator
Convert px to inches, cm, and mm instantly. Enter your pixel count and DPI to get exact physical print dimensions.
Understanding Pixels, DPI, and Physical Size
Pixels are abstract units of digital information — they have no inherent physical size. The actual size of an image in print or on screen depends entirely on the pixel density of the output device, measured in dots per inch (DPI) or pixels per inch (PPI).
Pixels vs. Physical Size
A 1000×1000 pixel image does not have a fixed physical size. At 100 DPI it prints at 10×10 inches. At 300 DPI it prints at 3.33×3.33 inches. At 72 DPI (web) it appears at 13.9×13.9 inches on screen. This is why understanding DPI is critical for print design and photography.
Screen Resolution vs. Print Resolution
Computer screens typically operate at 72–96 PPI (older monitors) or 144–220 PPI (Retina/high-DPI displays). Print quality requires 150–600 DPI. An image that looks sharp on screen may print blurry if the pixel count is too low for the desired print size.
Common Print Sizes and Pixel Requirements
For a 4×6 inch print at 300 DPI you need 1200×1800 pixels. For an 8×10 inch print at 300 DPI you need 2400×3000 pixels. An A4 sheet (8.27×11.69 inches) at 300 DPI requires 2481×3507 pixels — roughly 8.7 megapixels. Planning your pixel count before resizing avoids quality loss from upscaling.
Points (pt) in Typography
Points are a typographic measurement unit where 1 point = 1/72 inch. At 72 DPI, 1 pixel equals exactly 1 point. Font sizes in CSS and design software are specified in points. This matters when preparing print-ready documents where text must appear at a specific physical size.
Frequently Asked Questions
How do I convert pixels to inches?
Divide the number of pixels by the DPI (dots per inch) of your output device. For example, 300 pixels at 300 DPI equals 1 inch. Formula: inches = pixels ÷ DPI. Then multiply by 2.54 for centimeters, or 25.4 for millimeters.
What is DPI and PPI?
DPI (dots per inch) refers to printer output density. PPI (pixels per inch) refers to screen or image pixel density. They are often used interchangeably in practice. Both describe how many units of information fit into one linear inch of output.
What DPI should I use for printing?
Use 300 DPI for standard quality prints (photos, brochures, business cards). Use 150 DPI for draft proofs. Use 600 DPI for fine art or high-magnification prints. For large format banners viewed from a distance, 72–100 DPI is often sufficient.
How many pixels is 1 inch at 300 DPI?
At 300 DPI, 1 inch = 300 pixels. A 4×6 inch print requires 1200×1800 pixels. An 8×10 inch print requires 2400×3000 pixels. This is the standard for professional photography and offset printing.
How do I convert pixels to cm?
Step 1: inches = pixels ÷ DPI. Step 2: cm = inches × 2.54. Example: 600 pixels at 96 DPI = 6.25 inches = 15.875 cm. Use the Tab 1 calculator above to get all units at once.
What is the difference between screen resolution and print resolution?
Screen resolution (PPI) ranges from 72–220+ PPI. Print resolution (DPI) ranges from 150–600 DPI. A 1000-pixel image is ~10.4 inches on a 96 PPI screen but only ~3.3 inches at 300 DPI print. The same pixel image appears larger on screen because screens have fewer pixels per inch.
How many pixels do I need for an A4 print at 300 DPI?
A4 is 210 × 297 mm = 8.27 × 11.69 inches. At 300 DPI: 2481 × 3507 pixels. At 150 DPI: 1240 × 1754 pixels. Use the 2D Dimensions tab to verify your image dimensions before printing.
Why does the same pixel image look different sizes on screen vs print?
Physical size is determined by pixel density (PPI/DPI). On a 96 PPI monitor, a 960-pixel image displays at 10 inches. On a 300 DPI printer, those same 960 pixels print at just 3.2 inches. The pixels don't change — only the device density changes the apparent physical size.