DPI to Pixel & Dimension Converter
Interactive bidirectional dimensional calculator for engineering drawings, laser engraving, and additive manufacturing slicing resolution.
Standard Dimension to Pixel Conversion Chart
Reference| Standard Size | 72 DPI (Web) | 150 DPI (Draft) | 300 DPI (High Res) | 600 DPI (Ultra) |
|---|---|---|---|---|
| 1 Inch (25.4 mm) | 72 × 72 px | 150 × 150 px | 300 × 300 px | 600 × 600 px |
| 100 × 100 mm (3.94") | 283 × 283 px | 591 × 591 px | 1,181 × 1,181 px | 2,362 × 2,362 px |
| 4 × 6 Inch Print (101.6 × 152.4 mm) | 288 × 432 px | 600 × 900 px | 1,200 × 1,800 px | 2,400 × 3,600 px |
| US Letter 8.5 × 11" (215.9 × 279.4 mm) | 612 × 792 px | 1,275 × 1,650 px | 2,550 × 3,300 px | 5,100 × 6,600 px |
| A4 Sheet (210 × 297 mm) | 595 × 842 px | 1,240 × 1,754 px | 2,480 × 3,508 px | 4,960 × 7,016 px |
Standard Resolution Guidelines
- 72 DPI / PPI: Standard screen/web display resolution.
- 150 DPI: Draft blueprints and large-format plotters.
- 300 DPI: High-precision laser cutting, CNC raster carving, and technical print.
- 600+ DPI: Ultra-fine photoetching, lithography, and micro-machining.
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CAD & DPI FAQs
How do you calculate pixels from DPI and millimeters?
To convert millimeters to pixels, divide millimeters by 25.4 to get inches, then multiply by the DPI: Pixels = (Millimeters ÷ 25.4) × DPI. For example, 100mm at 300 DPI = (100 ÷ 25.4) × 300 = 1,181 pixels.
What DPI resolution should I use for laser engraving?
Optimal laser engraving resolution is typically 254 DPI to 318 DPI (0.1mm to 0.08mm line spacing). Setting DPI higher than your laser's optical focal spot diameter results in overlapping passes, prolonged job times, and burnt edges without adding detail.
What is the difference between DPI and PPI in CAD?
DPI (dots per inch) describes physical output dots created by a printer or laser head. PPI (pixels per inch) refers to the digital density of an image sensor or bitmap file. In digital vector rasterization, the two terms are functionally equivalent when setting export resolution.