MMaxTools

Aspect Ratio Calculator

Find the simplified aspect ratio of any width and height — and check presets.

The Aspect Ratio Calculator reduces any width and height to its simplest whole-number ratio using the GCD: 1920×1080 becomes 16:9, 1080×1080 becomes 1:1, 800×600 becomes 4:3.

Aspect ratios govern every screen decision — video export settings, thumbnail crops, CSS aspect-ratio properties and print layouts all demand a specific shape. Knowing the true ratio of your resolution tells you which preset it belongs to and what it will fit.

The tool also recognizes the common presets (16:9 widescreen, 4:3 classic, 1:1 square, 21:9 ultrawide, 3:2 photo) so your number comes with context. Runs locally in your browser.

Aspect ratio

16:9

reduced with GCD

Decimal

1.7778

1 : 0.5625

Common presets check

📺 16:9 — widescreen video standard

How to use the Aspect Ratio Calculator

  1. Enter the width in pixels.
  2. Enter the height in pixels.
  3. Read the simplified ratio (e.g. 16:9).
  4. Check the decimal form and reciprocal.
  5. See which common preset your resolution matches.

Frequently asked questions

How is an aspect ratio calculated?

Divide both width and height by their greatest common divisor. 1920 and 1080 share a GCD of 120, so 1920:1080 reduces to 16:9 — the ratio of width to height.

What is the difference between 16:9 and 4:3?

16:9 is widescreen — wider than tall, standard for modern video. 4:3 is the classic 'square-ish' TV and photo shape. Both describe width ÷ height; 16:9 ≈ 1.78, 4:3 ≈ 1.33.

Can this help me crop without distortion?

Yes — if your target is 16:9, any source cropped to a 16:9 region will fit perfectly. Use the ratio to compute the matching dimension from the side you know.

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