Convert Dot per Inch (DPI) to Pixel per Inch (PPI)
Live bidirectional calculator for Dots per Inch (DPI) (DPI) and Pixels per Inch (PPI) (PPI) with verified formula and conversion charts.
Digital Image Resolution8 units
How the Calculation Works (Linear Scaling)
Since 1 Dot per Inch (DPI) = 1 Pixels per Inch (PPI), multiply the value in Dots per Inch (DPI) 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.
Dot per Inch (DPI) to Pixel per Inch (PPI) Conversion Table
Precomputed values for quick reference and printing.
| 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 |
| 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 |
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 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.
About 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.
โ Frequently Asked Questions
How many Pixels per Inch (PPI) are in 1 Dot per Inch (DPI)?
There are exactly 1 Pixels per Inch (PPI) in 1 Dot per Inch (DPI) (1 DPI = 1 PPI).
What is the formula to convert Dot per Inch (DPI) to Pixel per Inch (PPI)?
The formula is: Pixel per Inch (PPI) = Dot per Inch (DPI) ร 1. Since 1 Dot per Inch (DPI) = 1 Pixels per Inch (PPI), multiply the value in Dots per Inch (DPI) 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 DPI to PPI manually?
To convert 1 DPI to PPI: apply the formula Pixel per Inch (PPI) = Dot per Inch (DPI) ร 1. Substituting gives: 1 ร 1 = 1 PPI.