Is the Aspect Ratio free to use?

Yes, the Aspect Ratio is completely free. There is no sign-up, no account required, and no limit on how often you can use it.

How accurate is the Aspect Ratio?

The Aspect Ratio uses standard mathematical formulas and produces results accurate to standard precision. For critical applications, always verify with an authoritative source.

What devices does the Aspect Ratio work on?

The Aspect Ratio works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.

🔢 Number Tools

Aspect Ratio Calculator

Find missing image dimensions from a ratio, or calculate the aspect ratio from width and height. Common ratio presets included.

The Aspect Ratio is a free online tool that helps you find missing image dimensions from a ratio, or calculate the aspect ratio from width and height. common ratio presets included It runs in your browser with no sign-up, downloads, or installation needed. All processing happens locally — your data stays on your device.

Width

Height

Scale to new width (or height)

How to use the Aspect Ratio

Common aspect ratios

16:9 — widescreen video, YouTube, most modern monitors. 4:3 — old TV, iPad. 1:1 — Instagram square, profile pictures. 21:9 — ultrawide cinema. 9:16 — phone video (TikTok, Reels, Stories). 3:2 — DSLR photo standard. 4:5 — Instagram portrait.

Scaling correctly

Enter your original dimensions and target width (or height). The other dimension is automatically calculated to maintain the exact ratio. Use this when resizing photos, creating thumbnails, or preparing images for different platforms.

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