Calculate your screen's exact Pixels Per Inch. Enter your resolution and diagonal size to find your PPI instantly.
√(1920² + 1080²) ÷ 15.6 = 141 PPI
PPI (Pixels Per Inch) measures how densely pixels are packed on your screen. Higher PPI means sharper text and images. A 4K 27" monitor has ~163 PPI, while a phone like iPhone 15 Pro has 460 PPI.
Use your calculated PPI with our free online ruler → for accurate measurements