Aspect Ratio Calculator

Calculate aspect ratios for screens, videos, and images. Find simplified ratios or scale width and height while preserving exact proportions.

Standard Aspect Ratios
Step 1: Original Dimensions or Ratio
Computed Ratio: 16:9 Decimal: 1.78 : 1
Step 2: Calculate New Scaled Size
Scale Multipliers
Proportional Visual Preview
1280 × 720

16:9 • Landscape

Common Standard Resolutions

Name / Standard Resolution Ratio Typical Use
Full HD (1080p) 1920 × 1080 16:9 YouTube, monitors, TV
2K Quad HD (1440p) 2560 × 1440 16:9 Gaming monitors
4K Ultra HD (2160p) 3840 × 2160 16:9 4K displays, cameras
Vertical Story / Reel 1080 × 1920 9:16 TikTok, Reels, Shorts
Square Post 1080 × 1080 1:1 Instagram feed, avatars

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How to use

  1. Enter original dimensions (W1 & H1) or click a preset aspect ratio (16:9, 4:3, 9:16, 1:1).
  2. Enter a desired new width (W2) or new height (H2), or click a scale multiplier (2×, 1.5×, 0.5×).
  3. The matching dimension and the live visual preview container will update instantly.

FAQ

How is aspect ratio calculated mathematically?

Width and height are divided by their greatest common divisor (GCD). For example, 1920 and 1080 have a GCD of 120, yielding 16:9.

What aspect ratio is used for vertical mobile videos?

Modern vertical mobile formats (TikTok, Instagram Stories, YouTube Shorts) adhere to a 9:16 aspect ratio, typically 1080×1920 pixels.

What is an ultrawide 21:9 monitor ratio?

21:9 (approximately 2.37:1) is the panoramic standard used in modern cinematic filmmaking and ultrawide curved desktop gaming monitors.

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