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Aspect Ratio Calculator

Compute size from a ratio, or ratio from size.

Presets
Aspect ratio (W : H)
:
Known side
16:9
Dimensions
1920 × 1080
Width
1920
Height
1080
Ratio
16 : 9
Decimal
1.777778
Diagonal
2202.90717
CSS
aspect-ratio: 16 / 9;

Über Aspect Ratio Calculator

An aspect ratio calculator finds the missing width or height from a ratio (e.g. 16:9) and one known side. You can also reverse the flow: enter W×H to get a simplified ratio and a CSS `aspect-ratio` declaration. toco.tools ships presets for Full HD / YouTube (16:9), classic 4:3, vertical video (9:16), square, golden ratio, A4 (√2), and more—plus custom ratios, orientation swap, live preview, and diagonal length. Everything runs in your browser; nothing is uploaded.

So funktioniert's

  1. Pick a preset or enter W:H
  2. Enter width or height and read the other side
  3. Copy the CSS aspect-ratio if needed

FAQ

What is an aspect ratio calculator?

A tool that computes the missing side from a ratio plus one dimension, and can emit CSS aspect-ratio.

For 16:9 and width 1920, what is the height?

1080—the same as Full HD (1920×1080).

Are calculations sent externally?

No. All processing runs in your browser.

What is the golden ratio preset?

About 1.618 : 1—often used for pleasing layout and artboard proportions.