DPI Calculator – Pixels to Inches, cm & Print Size

Convert pixels to print size, print size to pixels, or find the DPI of an image and see if it will print sharply. Runs in your browser — nothing is uploaded.

100% free
No sign-up
Nothing uploaded
No watermark
No limits
No bullshit

Width (px) Height (px) DPI

Print size (inches)–

Print size (cm)–

Megapixels–

Aspect ratio–

Common print sizes

Width Height Unit DPI

Pixels needed–

Megapixels–

Size in cm–

Common print sizes

Image width (px) Image height (px) Print width Print height Unit

Effective DPI–

Megapixels–

Max size at 300 DPI–

In short: DPI Calculator – Pixels to Inches, cm & Print Size is a free online tool with no sign-up and no upload — convert pixels to print size, print size to pixels, or find the DPI of an image and see if it will print sharply. Runs in your browser — nothing is uploaded.

How to use

Pick a mode. Pixels → Print size tells you how large an image prints at a given DPI. Print size → Pixels tells you how many pixels you need for a print. Find DPI checks whether an existing image is sharp enough for a particular print.
Enter your numbers. Use the common-size chips to fill in 4×6, 8×10, A4 and other standard prints instantly. Results update as you type.
Read the verdict. In Find DPI mode the coloured badge rates print quality: 300 DPI and up is excellent, 200–299 is good for most prints, 150–199 is acceptable for large prints viewed from a distance, and under 150 will look soft.

FAQ

What DPI should I use for printing?

300 DPI is the standard for photos and documents viewed at arm's length. Posters and banners viewed from further away look fine at 150 DPI, and large billboards are often printed at 30–50 DPI. For screens, DPI is irrelevant: only the pixel dimensions matter.

How many pixels do I need for an 8×10 print?

At 300 DPI you need 2400 × 3000 pixels (7.2 megapixels). At 200 DPI, 1600 × 2000 pixels is enough. Any modern phone camera produces more than that.

Is DPI the same as PPI?

Strictly, PPI (pixels per inch) describes digital images and DPI (dots per inch) describes printer output, but the terms are used interchangeably in everyday practice. This calculator treats them as the same number.

Does changing DPI in Photoshop change my image?

Changing the DPI value alone does not add or remove pixels; it only changes how large the image will print. To actually change the pixel count you have to resample the image, which can reduce sharpness when upscaling.

Simple Desk Tools vs. the usual suspects

	This tool	Typical "free" tool sites
Price	Free, forever	Free tier, then paywall
Account	None — open the page and go	Sign-up or email required
Your files	Stay on your device; nothing is uploaded	Uploaded to their servers, kept for hours
Watermark	None	On the free tier
Limits	None — any size, any number of files	Daily caps and file-size limits
Speed	Instant — runs in your browser	Queue, upload, wait, download

The no-bullshit promise: no registration, no upsell, no "premium" button, no watermark, no file limits, and your files never leave your computer. The site is paid for by a couple of ads, nothing else.

Privacy: all calculations happen on your device. No images or numbers are sent to a server.