1. What is Physical Size From Pixels?

The physical size of an image can be calculated from its pixel dimensions and the PPI (pixels per inch) value. This helps determine how large an image will appear when printed or displayed on a screen with known pixel density.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Pixels \) — The number of pixels along one dimension (width or height)
• \( PPI \) — Pixels per inch (also called DPI in printing contexts)

Explanation: The formula converts pixel dimensions to physical size by dividing by the pixel density (PPI).

3. Importance of PPI in Image Size

Details: PPI determines how densely pixels are packed in an inch of space. Higher PPI means smaller physical size for the same pixel count, resulting in higher quality prints.

4. Using the Calculator

Tips: Enter the pixel dimension (width or height) and the PPI value. Common PPI values are 72 (web), 300 (print), or the specific PPI of your display.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between PPI and DPI?
A: PPI refers to pixels per inch in digital images, while DPI refers to dots per inch in printing. They're often used interchangeably but technically different.

Q2: How do I find my screen's PPI?
A: You can calculate it by dividing the screen's resolution (in pixels) by its physical size (in inches).

Q3: Why does my image look smaller when printed?
A: Printing typically uses higher PPI (300+) than screens (72-150), so the same pixel dimensions produce a smaller physical print.

Q4: Can I change an image's PPI?
A: Changing PPI without changing pixel dimensions only affects metadata. To truly change resolution, you must resample the image.

Q5: What PPI should I use for web images?
A: Web images are displayed based on their pixel dimensions, not PPI. 72 PPI is traditional but largely irrelevant for web display.