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Aspect Ratio Calculator & Dimensions Solver

Calculate, reduce, and solve screen and image aspect ratios (16:9, 4:3, 1:1, 21:9, 9:16) with width-to-height formula solving and responsive video CSS code.

Presets:

1. Original Aspect Ratio

16 : 9
Simplified Aspect Ratio (1.778 : 1)
Padding-top percentage (CSS trick):56.25%

2. Calculate New Proportional Size

1280 × 720 px16:9 Ratio
CSS Rule:
aspect-ratio: 16 / 9;

How to Use the Aspect Ratio Calculator & Dimensions Solver

  1. 1Enter original width and height to calculate its simplified fraction ratio and decimal proportion.
  2. 2Or choose a preset standard ratio (16:9 widescreen, 4:3 standard, 9:16 TikTok/Reels, 1:1 square) and enter a target dimension to solve for the missing side.
  3. 3Copy the CSS aspect-ratio or padding-top percentage rule.

Key Features & Capabilities

  • Computes greatest common divisor (GCD) to find the irreducible fraction ratio
  • Dual-mode solver: Find ratio from dimensions, or find new dimension from ratio
  • Presets for social media: YouTube (16:9), TikTok/Stories (9:16), Instagram (1:1, 4:5), Ultrawide (21:9)
  • Generates modern CSS `aspect-ratio: 16 / 9;` and responsive iframe wrapper markup

Frequently Asked Questions

What is the most common video aspect ratio?

16:9 (1.77:1) is the standard widescreen format for high-definition television, YouTube, and computer monitors (e.g. 1920x1080, 2560x1440, 3840x2160). For vertical mobile video like Shorts and TikTok, 9:16 (1080x1920) is standard.

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