Convert pixels to inches, cm, mm, points, picas, and rem based on your DPI/PPI and root font size, every unit shown at once. Essential for print sizing, web design, and CSS typography.
Set your pixel density (DPI/PPI) and root font size, then enter a value in any unit to see the equivalent in pixels, inches, centimeters, millimeters, points, picas, and rem all at once. DPI is the setting most converters get wrong, 96 for screens, 300 for print, and it's exactly what decides whether output is sharp or blurry. rem uses your chosen root font size (16px by default).
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Enter a pixel value and your DPI/PPI to convert between pixels, inches, and centimeters. The DPI setting is the piece most converters get wrong, 96 DPI for screens versus 300 DPI for print, and it's exactly what determines whether your output is sharp or blurry.
Choose a DPI preset (or type one) to match your screen or printer, and set the root font size if you need rem, browsers default to 16px.
Pick a source unit and type the number. Pixels, inches, cm, mm, points, picas, and rem all update at once.
Read the target in the To field or click any unit card to copy its value for your design tool.
Designers use it to size images for print, set canvas dimensions, and check whether a photo has enough resolution before it goes to a printer. Because it exposes the DPI directly, you can plan assets at the correct physical size instead of guessing.
Divide the number of pixels by the DPI (dots per inch): Inches = Pixels ÷ DPI. For example, at 96 DPI (standard screen), 960 pixels = 960 ÷ 96 = 10 inches. At 300 DPI (print), 960 pixels = 3.2 inches.
Standard print quality: 300 DPI. High-quality photography: 300-600 DPI. Standard web display: 72-96 DPI. For printing a 4×6 inch photo at 300 DPI, you need 1200×1800 pixels minimum.
PPI (Pixels Per Inch) refers to digital screen density, how many pixels fit in one inch of screen. DPI (Dots Per Inch) refers to printer resolution. In practice, CSS and web design treat 1 inch = 96 pixels regardless of actual screen PPI.
CSS uses a reference pixel where 1 inch = 96px as a standard, regardless of your physical monitor's actual PPI. This ensures consistent layout across different screen densities. High-DPI (Retina) screens scale this up visually.
An A4 page (210mm × 297mm or 8.27" × 11.69") at 300 DPI = 2480 × 3508 pixels. At 72 DPI (screen), it's 595 × 842 pixels.
A Retina display (Apple) doubles or triples the physical pixel density compared to standard screens. A 13" MacBook Pro Retina has ~227 PPI vs 96 PPI on a standard monitor. However, CSS still uses 96px = 1 inch as a logical reference, so web layouts appear the same size, just sharper. When designing for Retina, use 2x resolution images.
Use 96 DPI for on-screen sizing and 300 DPI for print. The calculator lets you set the DPI so the pixel-to-inch conversion matches your medium.
Divide each pixel dimension by the print DPI. A 1800 x 1200 px image at 300 DPI prints at 6 x 4 inches. Enter the pixels and 300 DPI to see the print size.
CSS defines one inch as 96 pixels by convention, which is why 96 is the standard reference for web-to-physical conversions.
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