DPI / Print Size Calculator
Two directions: 'I have a 3000×2000 image — how big can I print it at 300 DPI?' and 'I want a 10×8 inch print at 300 DPI — what pixel size do I need?' This tool handles both, with presets for the standard print resolutions (72 for web, 150 for draft, 300 for photo quality, 600 for fine art reproduction). Also shows megapixels, aspect ratio, and rough JPEG/PNG/RAW file size estimates so you can sanity-check storage and quality before sending to print.
Common DPI presets
Megapixels
6.00 MP
Aspect ratio
3 : 2
File size estimate
JPEG
2.9 MB
PNG
11.4 MB
RAW (24-bit)
17.2 MB
Rough estimate — JPEG depends on quality, PNG on complexity. RAW assumes 24-bit BMP.
300 DPI is the photo-quality standard for prints viewed up close. Save your image at the full pixel count — the DPI tag is just metadata; only pixel count limits print size.
How to use
- Pick a direction — pixels → physical size, or physical size → required pixels.
- Enter dimensions, unit (inch, cm, mm), and DPI (or pick a preset).
- Read the result + megapixels, aspect ratio, and estimated file sizes.
Frequently asked questions
- What DPI should I print at?
- 300 DPI is the photo-quality standard (good for arm-length viewing). 150 is fine for drafts and posters viewed from a distance. 600 is overkill for most output but used for fine art reproduction and small text. 72 is screen-only — don't print at 72 unless it's huge and viewed from across a room.
- Is DPI the same as PPI?
- Close enough for this calculator. Strictly: PPI is pixel density on screens/files, DPI is dot density on printers. For 'how big can I print my image?' the math is the same: pixels / DPI = inches.
- Why is my image low DPI when the file looks fine on screen?
- DPI is metadata; the actual pixel count is what matters. A 3000×2000 image at 72 DPI is the same file as the same image at 300 DPI — it's just labeled differently. To print at 300 DPI you need 3000 pixels for a 10" wide print, regardless of the saved DPI tag.
- How accurate are the file size estimates?
- Rough. JPEG ranges 0.2–1.0 byte/pixel depending on quality and content; PNG ranges 1–4 byte/pixel depending on complexity. RAW (24-bit BMP) is exact. Use these to ballpark, not as a precise prediction.
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