DPI Calculator & Image Resolution Tools
Calculate image DPI, check resolution, convert pixels to inches, estimate print sizes, and calculate gaming mouse sensitivity — free, in your browser.
DPI Calculator
Upload an image or enter dimensions, pick a print size, and see horizontal and vertical DPI plus the maximum size at your target DPI.
Target DPI preset
Effective print DPI
300 DPI horizontal
Keeping the image aspect ratio, the print height would be 6.67 inches. Enter a print height above to check vertical DPI separately.
Excellent for photo-quality printing at close viewing distance.
Poor: below half the target. Good: at least half the target. Excellent: at or above the target. DPI alone does not guarantee print quality.
Reverse calculation — maximum print size at target DPI
At 300 DPI, this image prints up to 10 x 6.67 in.
Pixels required for your chosen print size at 300 DPI: 3000 x px (you have 3000 x 2000 px).
— 3000 px at 10 inches gives exactly 300 DPI.
Popular calculators
- DPI Calculator
Upload an image or enter pixel dimensions and a target print size to calculate the effective print DPI.
- Pixels to Inches
Convert pixels to inches at any DPI, instantly. Enter a pixel value, pick a DPI, and get the physical size in inches.
- PPI Calculator
Enter a screen's pixel resolution and diagonal size in inches to calculate pixels per inch (PPI).
- Print DPI Calculator
Enter pixel dimensions and a print size to find the effective print DPI, or pick a target DPI to find the largest print size.
- eDPI Calculator
Calculate eDPI, reverse-solve for sensitivity or DPI, and compare two setups side by side.
- Sensitivity Converter
Convert a sensitivity setting from one game to another using documented per-game yaw values, keeping the same cm/360 distance.
Browse by category
- Image Tools
Check, resize and convert images, and understand their resolution.
- Pixel Converters
Convert between pixels, inches, centimeters, millimeters and megapixels.
- Print Tools
Work out print sizes, paper pixel requirements and print DPI.
- Gaming Tools
eDPI, sensitivity conversion and cm/360 for popular FPS games.
- Screen & PPI
Pixel density, screen dimensions and display aspect ratios.
Guides
- How Mouse DPI and Sensitivity Work
DPI sets how many counts your mouse reports per inch; sensitivity scales those counts in game. Together they set your turn speed.
- How to Calculate Image DPI
Divide pixel width by print width in inches. Worked examples for photos, posters and screen images.
- How to Calculate PPI
PPI is diagonal pixels divided by diagonal inches. Worked examples for monitors, laptops and phones.
- How to Choose the Right Image Resolution for Printing
Match DPI to viewing distance and print size, and check your image before you print.
- How Many Pixels Do You Need for Printing?
Multiply print size in inches by your target DPI. A table for common photo, poster and paper sizes.
- What Is cm/360 in Gaming?
cm/360 is the physical mouse distance for a full 360-degree turn. It is the fair way to compare sensitivity across games.
- All 12 guides →
From the blog
- Passport and Document Photo Printing: Correct Sizes, Pixels, and DPI
A passport photo is small, close-up, and unforgiving. Learn the correct sizes, pixel dimensions, and DPI for common document photos, with worked examples and printing checks.
- How Much DPI Does a Banner or Hoarding Need? Viewing Distance Rules for Large-Format Print
A banner seen from ten metres away does not need 300 DPI. Learn how viewing distance sets the DPI a large-format print really needs, with worked examples for banners, hoardings and billboards.
- Printer DPI vs Image DPI: Why a 4800 DPI Printer Does Not Mean a 4800 DPI Photo
A printer's 4800 DPI and your photo's 300 DPI measure different things. Learn what each number really counts, why they are not interchangeable, and how to set up a print correctly.
- All blog posts →
Frequently asked questions
What is DPI?
DPI means dots per inch. Effective print DPI is pixel width divided by print width in inches. A 3000-pixel image printed 10 inches wide is 300 DPI.
Is a higher DPI always better?
Not by itself. DPI only matters together with pixel dimensions and print size. A small image printed very large will still look soft, even if it is labelled 300 DPI.
What is the difference between DPI and PPI?
PPI describes pixel density on a display; DPI describes dots per inch in printing. They are related ideas, but not the same measurement.
Does changing DPI metadata add detail?
No. It changes the suggested print size, not the pixels. Detail only comes from having enough pixels in the original image.