Image Aspect Ratio Calculator Online (Free, Fast & Secure) – DataMorph

Calculate the aspect ratio of any image from width and height. Scale dimensions proportionally for social media, video, and web. Free online image aspect ratio calculator.

Image Aspect Ratio Calculator

Calculate the exact aspect ratio of any image from its pixel dimensions and scale to new sizes while maintaining the correct proportional ratio. Enter width and height to get the ratio (e.g., 16:9, 4:3, 1:1), then calculate scaled dimensions for any target size.

How to Calculate Image Aspect Ratio

Aspect ratio = Width : Height, simplified by GCD. Example: 1920x1080 pixels — GCD(1920,1080) = 120 — so 1920/120 : 1080/120 = 16:9.

Common Aspect Ratios

  • 16:9 — HD video, YouTube, desktops, TV (1920x1080, 1280x720)
  • 4:3 — Old monitors, iPads, photography (1024x768)
  • 1:1 — Instagram square posts (1080x1080)
  • 9:16 — Instagram Stories, TikTok, Reels (1080x1920)
  • 4:5 — Instagram portrait posts (1080x1350)
  • 3:2 — DSLR photos, 35mm film (3000x2000)
  • 21:9 — Ultrawide monitors, cinema (2560x1080)

Frequently Asked Questions

How do I calculate the aspect ratio of an image?

Divide the width and height by their greatest common divisor (GCD). For 1920x1080: GCD=120, so 16:9. Enter any dimensions in this calculator for an instant result.

What is a 16:9 aspect ratio in pixels?

Any size where width/height = 1.777: 1920x1080, 1280x720, 2560x1440, 3840x2160, 640x360, 1366x768.

What aspect ratio should I use for Instagram?

Square feed: 1:1 (1080x1080), Portrait feed: 4:5 (1080x1350), Stories/Reels: 9:16 (1080x1920), Landscape: 1.91:1 (1080x566).