Convert Pixel per Inch (PPI) to Dot per Inch (DPI)
Live bidirectional calculator for Pixels per Inch (PPI) (PPI) and Dots per Inch (DPI) (DPI) with verified formula and conversion charts.
Digital Image Resolution8 units
How the Calculation Works (Linear Scaling)
Since 1 Pixel per Inch (PPI) = 1 Dots per Inch (DPI), multiply the value in Pixels per Inch (PPI) by 1. Note: DPI (printer ink droplets) and PPI (image pixels) represent distinct physical concepts; this conversion assumes a direct 1:1 raster sample mapping without halftone screening.
Pixel per Inch (PPI) to Dot per Inch (DPI) Conversion Table
Precomputed values for quick reference and printing.
| Pixel per Inch (PPI) | Dot per Inch (DPI) |
|---|---|
| 1 PPI | 1 DPI |
| 2 PPI | 2 DPI |
| 3 PPI | 3 DPI |
| 4 PPI | 4 DPI |
| 5 PPI | 5 DPI |
| 6 PPI | 6 DPI |
| 7 PPI | 7 DPI |
| 8 PPI | 8 DPI |
| 9 PPI | 9 DPI |
| 10 PPI | 10 DPI |
| 15 PPI | 15 DPI |
| 20 PPI | 20 DPI |
| 25 PPI | 25 DPI |
| 30 PPI | 30 DPI |
| 40 PPI | 40 DPI |
| 50 PPI | 50 DPI |
| 75 PPI | 75 DPI |
| 100 PPI | 100 DPI |
| Dot per Inch (DPI) | Pixel per Inch (PPI) |
|---|---|
| 1 DPI | 1 PPI |
| 2 DPI | 2 PPI |
| 3 DPI | 3 PPI |
| 4 DPI | 4 PPI |
| 5 DPI | 5 PPI |
| 6 DPI | 6 PPI |
| 7 DPI | 7 PPI |
| 8 DPI | 8 PPI |
| 9 DPI | 9 PPI |
| 10 DPI | 10 PPI |
| 15 DPI | 15 PPI |
| 20 DPI | 20 PPI |
| 25 DPI | 25 PPI |
| 30 DPI | 30 PPI |
| 40 DPI | 40 PPI |
| 50 DPI | 50 PPI |
| 75 DPI | 75 PPI |
| 100 DPI | 100 PPI |
๐ Standard Benchmark Reference Values
Under a 1:1 direct sampling assumption. In printing, reproducing a 300 PPI continuous-tone image typically requires 1200 or 2400 DPI printer droplets for halftone dithering.
Exact RatioAbout Pixel per Inch (PPI) (PPI)
A measure of digital display pixel density and bitmap image sampling resolution, expressing the number of addressable electronic pixels per linear inch (approx. 39.370 pixel/m). Distinct from DPI: PPI represents discrete digital color samples rather than analog ink droplets.
History: Adopted across computer monitor and digital photography standards (e.g. standard 72 PPI Mac, 96 PPI Windows, and modern 300โ460 PPI Retina/OLED mobile screens).
Common Uses: Smartphone and laptop display sharpness benchmarks, digital image file metadata (EXIF resolution tags), Photoshop canvas sizing.
About Dot per Inch (DPI) (DPI)
A traditional measure of physical print resolution, expressing the number of discrete ink dots or laser exposure points a printer can produce per linear inch (1 / 0.0254 dot/m โ 39.370 dot/m). Note: DPI describes physical printer ink droplets, which must not be confused with image sample pixel density (PPI).
History: Introduced with early desktop laser printers (such as the 300 DPI Apple LaserWriter in 1985) and phototypesetting imagesetters.
Common Uses: Desktop inkjet/laser printer output settings (e.g. 600 DPI, 1200 DPI, 2400 DPI), offset printing plate exposure.
โ Frequently Asked Questions
How many Dots per Inch (DPI) are in 1 Pixel per Inch (PPI)?
There are exactly 1 Dots per Inch (DPI) in 1 Pixel per Inch (PPI) (1 PPI = 1 DPI).
What is the formula to convert Pixel per Inch (PPI) to Dot per Inch (DPI)?
The formula is: Dot per Inch (DPI) = Pixel per Inch (PPI) ร 1. Since 1 Pixel per Inch (PPI) = 1 Dots per Inch (DPI), multiply the value in Pixels per Inch (PPI) by 1. Note: DPI (printer ink droplets) and PPI (image pixels) represent distinct physical concepts; this conversion assumes a direct 1:1 raster sample mapping without halftone screening.
How do I convert 1 PPI to DPI manually?
To convert 1 PPI to DPI: apply the formula Dot per Inch (DPI) = Pixel per Inch (PPI) ร 1. Substituting gives: 1 ร 1 = 1 DPI.