How to convert pixels to inches
Pixels only map to a physical size once you know the DPI (dots per inch): inches = pixels ÷ DPI. At the common screen value of 96 DPI, 1,920 pixels ÷ 96 = 20 inches. For print, 300 DPI is typical, so the same pixels cover far less physical space.
Working backwards is just as useful: multiply the physical size by the DPI to find the pixels you need. A photo intended to print 8 in wide at 300 DPI requires 8 × 300 = 2,400 pixels across, so a 1,600-pixel file will look soft at that size.
DPI and PPI are used interchangeably for this calculation. Strictly, PPI describes pixels in an image file and DPI describes ink dots a printer lays down, but the arithmetic is identical.
If the next number you need is a related one, the inches to cm calculator covers it.
Once you are done here, the colour picker picks up where this leaves off.
How to use this calculator
Enter the pixels and the DPI of your screen or image. The result shows inches and centimetres. Use 96 DPI for typical web screens and 300 DPI for print-quality images.
The 96 DPI figure is a CSS convention rather than a measurement of your monitor, which is why a CSS inch is not a real inch on a high-density display. A modern phone screen can pack over 400 physical pixels per inch while still reporting 96 CSS DPI, because the browser scales everything by the device pixel ratio.
Some practical targets: 300 DPI for photo prints and magazines, 150 DPI for posters seen from a metre away, and 72–96 DPI for anything that only ever appears on screen. Upsampling a small file to hit a DPI target adds pixels but no detail, so start from the largest original you have.
A quick pass through the cm to inches calculator saves a step later on.
Frequently asked questions
- How do I convert pixels to inches?
- Divide the pixels by the DPI. At 96 DPI, 1,920 pixels is 20 inches.
- What DPI should I use?
- 96 DPI is standard for web screens; 300 DPI is common for print. The DPI determines the physical size.
- How many pixels is one inch?
- It equals the DPI — 96 pixels per inch at 96 DPI, or 300 at print resolution.
- Why do I need DPI to convert?
- A pixel has no fixed physical size; DPI tells you how many pixels fit in one inch.
- Why does my 300 DPI image print smaller than it looks on screen?
- Because the same pixels are packed more than three times tighter. A 1,920-pixel image is 20 inches wide at 96 DPI but only 1,920 ÷ 300 = 6.4 inches when printed at 300 DPI — the pixel count never changed, only the density.