Image Resolution Converter — DPI, PPI & DPC Converter
Convert image resolution between different units including dots per inch, pixels per inch, dots per centimeter, lines per inch, and more. Essential for print design, digital imaging, and display technology. See also our Pixel to cm Calculator and Light Intensity Converter.
Value:
How to Convert Image Resolution
- Enter the image resolution value in the input field above.
- Select the unit you are converting from in the "From" dropdown menu.
- Select the unit you want to convert to in the "To" dropdown menu.
- The result will automatically appear in the result field.
- Use the copy button to copy the result to your clipboard.
- Click any conversion in the list below to quickly select those units.
Image Resolution Formula
Image Resolution Definition:
R = N/L
Where:
R = Resolution (dots or pixels per unit length)
N = Number of dots/pixels
L = Physical length
Unit Relationships:
1 dpi = 1 dot per 25.4 mm = 0.3937 dpcm
1 dpcm = 2.54 dpi
1 dpi = 39.3701 dpm (dots per meter)
1 ppi = 1 dpi (numerically equivalent)
1 lpi = 1 dpi (for halftone screens)
Common Conversions:
dpi to dpcm: divide by 2.54
dpcm to dpi: multiply by 2.54
dpi to dpmm: divide by 25.4
dpmm to dpi: multiply by 25.4Example Conversion
Problem: Convert 300 dpi to dpcm and dpmm.
Given: R = 300 dpi
Solution:
• To dpcm: 300 ÷ 2.54 = 118.11 dpcm
• To dpmm: 300 ÷ 25.4 = 11.811 dpmm
Answer: 300 dpi = 118.11 dpcm = 11.811 dpmm
Technical Details
Image resolution describes the detail an image holds, measured as the number of dots, pixels, or lines per unit length. DPI (dots per inch) is used primarily for print output, while PPI (pixels per inch) refers to screen display density. Though often used interchangeably, DPI technically refers to printer output dots while PPI refers to digital image pixels.
For print, 300 dpi is the standard for high-quality output, while 72-96 ppi is typical for screen display. The CSS specification uses 96 ppi as the reference pixel density. Modern high-DPI displays (Retina, 4K) use 200-500+ ppi. LPI (lines per inch) is used in halftone printing, where the relationship between LPI and DPI determines print quality (typically DPI = 2 × LPI for quality output).
Image Resolution Reference Table
| Application | Typical Resolution | Context |
|---|---|---|
| Web images | 72-96 ppi | Screen display |
| Standard print | 300 dpi | Magazines, photos |
| Newspaper print | 150-200 dpi | Newsprint quality |
| Large format print | 100-150 dpi | Banners, posters |
| iPhone Retina display | 326 ppi | Mobile screen |
| MacBook Pro Retina | 226 ppi | Laptop screen |
| 4K monitor (27") | 163 ppi | Desktop display |
| Professional prepress | 1200-2400 dpi | Offset printing |
Frequently Asked Questions
What is the difference between DPI and PPI?
DPI (dots per inch) refers to the physical dots a printer can produce per inch. PPI (pixels per inch) refers to the pixel density of a digital image or display. For digital images, they are numerically equivalent, but they describe different physical phenomena.
What DPI should I use for printing?
For high-quality photo printing, use 300 dpi. For newspaper or draft quality, 150-200 dpi is acceptable. Large format prints viewed from a distance can use 100-150 dpi. Professional prepress may require 1200+ dpi for line art.
How do I convert DPI to dots per centimeter?
Divide the DPI value by 2.54 (since 1 inch = 2.54 cm). For example, 300 dpi ÷ 2.54 = 118.11 dpcm. Conversely, multiply dpcm by 2.54 to get dpi.
What is LPI and how does it relate to DPI?
LPI (lines per inch) measures halftone screen frequency in offset printing. For quality output, printer DPI should be at least 2× the LPI. A 150 lpi screen requires at least 300 dpi output. Higher ratios produce smoother gradients.
Does changing DPI change image quality?
Changing DPI metadata alone does not change pixel count or image quality — it only changes the physical print size. To increase actual quality, you need more pixels. A 3000×2000 pixel image at 300 dpi prints at 10×6.67 inches; at 150 dpi it prints at 20×13.33 inches with lower quality.
Objective of Measurement:
Measurement is the most important aspect of our life. We use measurement in science, engineering, business trading, personal life, education, and more other fields. As technology is growing day by day so we need a highly accurate and easy convenient global measuring system in each and every field. It is essential to use standard measurement in every field that everyone to be sure that they not get cheated.
History of Measurement:
In history for measurement people used the human body as a tool. For measuring length used forearm, hand, foot & finger as a unit. The foot, finger is a subdivided shorter unit of a length. This type of measurement is not accurate cause different in size of the arm & finger for different people & some of the countries still using it. In history, there were lots of measuring systems developed but mostly used imperial, the metric system of measurement. We use these systems for measure distances, volume, weight, speed, area etc. Due to this a major problem everyone is facing while doing trading between the countries. A huge improvement in civilization, It necessary to improve measuring standards. Nowadays International Standard (SI) units are used as a global measurement system.
Image Resolution Conversion - Unit Converter:
Our image resolution conversion converter convert dot/meter [dpm], dot/inch [dpi], dot/centimeter [dpcm], pixel/inch [ppi], dot/millimeter [dpmm], pixel/centimeter [ppcm], pixel/meter [ppm], line/inch [lpi], line/centimeter [lpcm] vice versa with metric conversion.
Image resolution conversions & its abbreviations
| Unit | Abbreviation | Unit | Abbreviation |
|---|---|---|---|
| dot/meter | dpm | dot/inch | dpi |
| dot/centimeter | dpcm | pixel/inch | ppi |
| dot/millimeter | dpmm | pixel/centimeter | ppcm |
| pixel/meter | ppm | line/inch | lpi |
| line/centimeter | lpcm |
Complete list of Image resolution conversion units and its conversion.
1 dot/inch [dpi] = 0.3937 dot/centimeter [dpcm]
1 dot/centimeter [dpcm] = 2.54 dot/inch [dpi]
1 dot/inch [dpi] = 1 pixel/inch [ppi]
1 dot/inch [dpi] = 39.3701 dot/meter [dpm]
1 dot/millimeter [dpmm] = 25.4 dot/inch [dpi]
1 dot/inch [dpi] = 1 line/inch [lpi]
1 pixel/centimeter [ppcm] = 2.54 pixel/inch [ppi]
1 line/centimeter [lpcm] = 2.54 line/inch [lpi]