By Ahsan Khowaja · Updated 27 October 2026
Two meanings of DPI
"DPI" is searched for by two very different groups of people, so this page has two halves.
- Images and printing: DPI (dots per inch) is how many image pixels are squeezed into each inch of paper. More DPI at the same print size means a sharper print; the usual target for photos is 300 DPI.
- Gaming mice: DPI is how many counts the sensor reports per inch of mouse movement. Multiplied by the in-game sensitivity it gives eDPI, the number players compare.
Pick the mode you need at the top of the calculator. The first two are the DPI calculator for print; the last two are the DPI calculator for mouse settings.
Image DPI: pixels and print size
To find the DPI of an image at a print size, you need the image's pixel dimensions and how wide you want to print it:
DPI = pixel width ÷ print width in inches
A 3000 × 2000 pixel photo printed 10 inches wide is 3000 ÷ 10 = 300 DPI, and its height prints at 2000 ÷ 300 = 6.67 inches (25.4 × 16.9 cm). A 4032 × 3024 phone photo printed 8 inches wide is 504 DPI, more than enough for a frame. Choose centimetres in the calculator and it converts for you (2.54 cm per inch).
The reverse question, pixels to DPI to print size, is just as common: how big can this image be printed? Print width = pixel width ÷ DPI. A 1920 × 1080 screenshot at 300 DPI prints at only 6.4 × 3.6 inches (16.3 × 9.1 cm); a 6000 × 4000 camera photo at 150 DPI covers 40 × 26.7 inches, a decent poster. The result table shows the same image at 72, 150, 200, 240 and 300 DPI so you can see where the trade-off lands. For the largest sharp print at one glance, the print size calculator starts from the DPI you want.
How much DPI does a print need?
| Print DPI | What it is good for |
|---|---|
| 300 and above | Photo prints, books, magazines, anything inspected close up. The standard print-shop request. |
| 200 to 299 | Framed photos and photo books viewed at arm's length; the difference from 300 is hard to see. |
| 150 to 199 | Posters viewed from a metre or more. |
| 100 to 149 | Large wall prints and banners seen from across a room. |
| Under 100 | Billboards and backdrops only; close up, pixels or blur show. |
These are working rules of thumb, not laws. Printing method matters (canvas hides low DPI better than glossy paper) and so does the subject: a soft landscape forgives 150 DPI more readily than small text does.
Mouse DPI and eDPI
Mouse DPI on its own tells you nothing about how fast your aim moves, because games multiply it by their own sensitivity setting. The number that actually describes your aim speed is eDPI (effective DPI) = mouse DPI × in-game sensitivity. Two players with 800 DPI × 0.35 and 400 DPI × 0.7 both have an eDPI of 280 and turn exactly the same distance for the same hand movement.
eDPI only means something within one game, because each game's sensitivity scale is different. An eDPI calculator for Valorant typically deals in numbers around 200 to 400 (its sensitivity values are small), while a DPI calculator for CS2 players sees eDPI figures of 600 to 1,000 or more, since Counter-Strike sensitivity numbers run higher. Comparing a Valorant eDPI with a CS2 eDPI is meaningless; to carry your aim between games you need the sensitivity converter, which accounts for each game's turn-per-count constant. The dedicated eDPI calculator goes deeper on per-game ranges.
Changing mouse DPI without changing your aim
If you switch from 400 to 800 DPI, your cursor and your in-game turn speed double. To keep everything feeling identical, scale the sensitivity down by the same factor:
New sensitivity = old sensitivity × old DPI ÷ new DPI
At 400 DPI with sensitivity 2, your eDPI is 800. Moving to 800 DPI, the new sensitivity is 2 × 400 ÷ 800 = 1, and eDPI stays 800. Going from 1600 DPI at 0.3 down to 800 DPI gives 0.6. The calculator's fourth mode does this and shows the unchanged eDPI as a check. Most games let you type a sensitivity with several decimals in the console or config file, so the result doesn't have to be a round number.
A note on Free Fire and other phone games: they're played with touch controls, so there is no mouse DPI to calculate. When Free Fire players talk about "DPI" they usually mean Android's Smallest width display setting in Developer options, which changes how large everything is drawn on the screen and therefore how far a swipe moves on screen. That's a phone display setting, not something a DPI calculator for Free Fire can work out for you: change it in small steps, note the original value so you can go back, and fine-tune with the game's own sensitivity sliders.
DPI vs PPI: the honest version
Strictly, PPI (pixels per inch) describes pixels on a screen or in an image, and DPI (dots per inch) describes the ink dots a printer sprays, where a single image pixel may be built from many dots. In practice, image editors, printers' order forms and most people use "DPI" for an image's pixels per inch of print, and this page follows that usage. For the pixel density of a monitor or phone screen, use the PPI calculator, which is the correct term there.
The important point is what the DPI number in a file is. An image file is a grid of pixels; the DPI stored in its metadata is just a suggested print size, a label that says "print me at 300 per inch". Changing the label does not add or remove a single pixel. A 1200 × 800 photo at 72 DPI and the same photo re-labelled 300 DPI are identical files apart from one number, and both will look the same on screen and on the web.
