kbwenLab

Aspect Ratio Board

Enter width and height to see the ratio, frame shape, and a copy-ready CSS snippet.

Input size

Lock the ratio so one side updates the other

When the ratio is locked, changing width or height updates the other side to keep the same shape.

Current ratio

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Enter dimensions to render the frame preview, ratio details, and scaled sizes.

Paste-ready CSS .frame { aspect-ratio: --; }
Decimal ratio --

Quick presets

Live

Preview stage

Frame Parade

Live frame

Primary frame

Add dimensions to see whether the frame feels closer to a cover, poster, or widescreen canvas.

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Preview updates live as you switch examples, fit modes, and dimensions.

Common width scaling

These cards show the matching height for a few practical widths.

Quick guide

Use cases, answers, and nearby tools

Compact below-tool notes that help first-run users and repeated visitors move faster without changing the main interface.

Chinese search: 長寬比 計算機、圖片比例 計算、aspect ratio 計算

How to use

Run a clean first pass

  1. Enter a width and height or choose one of the preset boards.
  2. Compare the reduced ratio and visual frame side by side.
  3. Copy the CSS `aspect-ratio` value or use the result to plan media slots.

Examples

Real jobs this page helps with

  • Hero media planningCompare 16:9, 4:5, and square layouts before building a responsive landing page section.
  • Social creative sizingCheck whether a product or portrait frame should use landscape, portrait, or square treatment.

FAQ

What people usually want to know

Does it resize image files?

No. It calculates ratio math and preview framing only.

Can I copy a CSS-ready value?

Yes. It is designed to help you move from visual planning into CSS quickly.

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