DPI / PPI Calculator
Convert between pixels and print dimensions, calculate screen PPI, and find the right DPI for your project. Free tool for designers and photographers.
Frequently asked questions
What is an aspect ratio?
An aspect ratio describes the proportional relationship between width and height of an image, video, or screen. For example, 16:9 means the width is 16 units for every 9 units of height.
Why does aspect ratio matter?
Using the correct aspect ratio prevents cropping, stretching, or black bars. Each platform (YouTube, Instagram, TikTok) expects specific ratios for optimal display.
How do I calculate aspect ratio manually?
Divide both width and height by their greatest common divisor (GCD). For 1920×1080, the GCD is 120, giving 16:9.
What's the best aspect ratio for social media?
Instagram feed: 1:1 or 4:5. Stories/Reels: 9:16. YouTube: 16:9. Twitter: 16:9 for video, 2:1 for images.
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