Convert Dots per pica to Dots per pixel

Convert Dots per pica (dot/pica) to Dots per pixel (dppx) instantly and accurately.

Conversion Formula

dppx = dot/pica × 0.0625

About Dots per pica

The dot per pica (dot/pica) is a typographic resolution unit linking printer DPI to the pica - exactly 1/6 inch in the PostScript standard (Adobe, 1985). A 72 DPI Macintosh screen placed exactly 12 dots per pica (1 dot per point); a 300 DPI LaserWriter placed 300/6 = 50 dot/pica, providing 50-level halftone cells per pica. High-end digital imagesetter platemakers: Agfa Selectset Avantra 45 at 3600 DPI = 600 dot/pica; modern 2400 DPI proofers produce 400 dot/pica. Desktop publishing software - Adobe InDesign, QuarkXPress, Affinity Publisher - defaults to pica+point rulers (e.g., 4p6 = 4 picas 6 points = 0.75 inch), making dot/pica a natural precision unit for typographic rasterisation quality assessment. 1 dot/pica = 6 DPI = 6 PPI (since 1 pica = 1/6 in). 1 dot/pica = 6 PPI = 15.24 dot/m.

About Dots per pixel

The dot per CSS-pixel unit (dppx, or the x descriptor in CSS) is defined in W3C CSS Images Level 3 / Media Queries Level 4 as the ratio of physical device pixels to CSS reference pixels, where the CSS spec fixes 1 CSS inch ≡ 96 CSS px exactly. Therefore 1 dppx = 96 DPI = 96 PPI exactly; a screen reporting device pixel ratio (DPR) of 2 has 2 dppx = 192 physical dots per CSS inch. JavaScript exposes DPR as window.devicePixelRatio, numerically equal to dppx. Reference values: standard laptop (96-110 PPI): 1 dppx; MacBook Pro 13-inch Retina (227 PPI): 2 dppx; iPhone 15 Pro 6.1-inch (460 PPI): 3 dppx; Samsung Galaxy S24 Ultra (501 PPI): ≈ 3.09 dppx. The HTML img srcset x descriptor (photo@2x.jpg 2x) is numerically equal to dppx, serving higher-resolution images for HiDPI screens. The CSS @media (min-resolution: 2dppx) query targets any display with DPR ≥ 2. 1 dppx = 96 DPI = 96 PPI.

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