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Aspect Ratio Calculator

Find proportional widths and heights for videos, photography, responsive CSS layouts, and graphic design without distortion or stretched pixels.

4.8(540 reviews)

Aspect Ratio Calculator Workspace

This client-side utility is staged and ready for local processing. Files and inputs are processed exclusively on your device without server transmission.

Drag & drop input here or click to select

Supports standard formats • 100% private in-browser memory

Encrypted local sandboxing: No data leaves your machine.
Execution Runtime

Browser Client (Wasm / Web API)

Zero remote server calls

File Size Limitation

Uncapped (Hardware RAM)

No artificial 5MB limits

Data Retention

0 ms (Discarded on Exit)

Never written to any database

Step-by-Step Instructions

How to use Aspect Ratio Calculator

01

Enter original dimensions

Provide original width and height (e.g. 1920 x 1080).

02

Enter target size

Input either a target width or target height to calculate the matching dimension.

03

Copy CSS or values

Grab proportional numbers or CSS snippet for your project.

Key Features & Capabilities

Built for speed, accuracy, and complete privacy

Preset ratios: 16:9 (HD), 4:3 (Standard), 21:9 (Ultrawide), 1:1 (Square), 9:16 (Stories/Reels)
Automatic dimension recalculation when changing width or height
CSS aspect-ratio code snippet generator
Frequently Asked Questions

Common questions about Aspect Ratio Calculator

The standard aspect ratio for desktop YouTube videos is 16:9 (e.g. 1920x1080 or 1280x720). For YouTube Shorts, it is 9:16 (1080x1920).

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