Print Size Calculator
Print Size Calculator: free, instant and private. The same 1920 px image is a sharp 6×4-inch print at 300 DPI and a blurry A3 poster.
How the Print Size Calculator works
The Print Size Calculator takes Image width in pixels, Print width in inches and returns the answer instantly — no button to hunt for, no page reload. The same 1920 px image is a sharp 6×4-inch print at 300 DPI and a blurry A3 poster. Decide the print size first, then check whether your pixels are enough — the reverse order is how posters end up pixelated.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
DPI = image pixels ÷ print size in inches
| Symbol | Meaning |
|---|---|
| 300 DPI | the print standard — crisp at reading distance |
| 150 DPI | acceptable for posters viewed from a metre |
| 72–96 DPI | screen territory — will look soft on paper |
The same 1920 px image is a sharp 6×4-inch print at 300 DPI and a blurry A3 poster. Decide the print size first, then check whether your pixels are enough — the reverse order is how posters end up pixelated.
Inputs used: Image width in pixels, Print width in inches.
Worked example
Take the default example — image width in pixels of 1920, print width in inches of 12:
- Effective DPI: 160
- Verdict: acceptable for posters
- Megapixels (square assumption): 3.7
Frequently asked questions
- What formula does the Print Size Calculator use?
- It uses DPI = image pixels ÷ print size in inches, where 300 DPI is the the print standard — crisp at reading distance; 150 DPI is the acceptable for posters viewed from a metre; 72–96 DPI is the screen territory — will look soft on paper.
- Is the Print Size Calculator free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- How do I read the result?
- The same 1920 px image is a sharp 6×4-inch print at 300 DPI and a blurry A3 poster. Decide the print size first, then check whether your pixels are enough — the reverse order is how posters end up pixelated.
- Does the Print Size Calculator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.