CMYK ↔ RGB ↔ HEX Color Converter
About Image PPI Calculator
The Display PPI / Pixel Density & Viewing Distance Calculator evaluates screen width, height, and diagonal screen size (inches) to calculate exact Pixels Per Inch (PPI), pixel pitch (mm), Retina display rating, and optimal human visual acuity distance.
How to Use Image PPI Calculator
Step 1
Enter screen resolution (Width $\times$ Height in pixels) and diagonal screen size in inches.
Step 2
Review the computed PPI, pixel pitch, and Retina viewing distance.
Step 3
Click "Copy PPI Details".
Practical Use Cases for Image PPI Calculator
Auditing Monitor, Laptop & Phone Screen Densities
Calculate exact PPI for custom display setups (e.g. 27" 4K = 163 PPI, 14" MacBook Pro = 254 PPI, 6.1" iPhone = 460 PPI).
Evaluating Apple "Retina" Visual Acuity Distance
Determine the exact viewing distance at which individual screen pixels become completely invisible to the human eye ($20/20$ vision).
Input & Output Examples
Calculating PPI for 27-inch 4K Monitor
Resolution: `3840x2160` (4K UHD) | Diagonal: `27 inches`
PPI: `163.18 PPI` | Pixel Pitch: `0.1557 mm` | Retina Distance: `21.1 inches` (53.6 cm)
Key Features & Performance
- ✓Calculates: Exact PPI (Pixels Per Inch), Dot Pitch / Pixel Pitch in millimeters, Total Megapixels, and Visual Acuity Distance.
- ✓Retina Display Checker: determines if screen qualifies as "Retina" at standard desktop/phone viewing distances.
- ✓Includes database of 50+ modern device displays (MacBook, iPhone, iPad, Galaxy, Dell UltraSharp, Studio Display).
- ✓100% Client-Side memory execution.
- ✓1-Click Copy PPI metrics.
Key Terminology & Definitions
PPI (Pixels Per Inch)
A measurement of the pixel density of an electronic image device, such as a computer monitor or television display.
Pixel Pitch (Dot Pitch)
The physical distance in millimeters between the centers of two adjacent pixels on a display panel.