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Aspect Ratio Calculator

Calculate and simplify aspect ratios. Find missing dimensions for 16:9, 4:3, 1:1, and more. Free online aspect ratio calculator.

Calculate Ratio

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Find Missing Dimension

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Common Aspect Ratios

16:9
Widescreen HD/4K (1920×1080, 3840×2160)
4:3
Classic TV, older monitors (1024×768)
1:1
Square (Instagram posts, profile photos)
21:9
Ultrawide cinema, ultra-widescreen monitors
16:10
MacBook displays, older widescreen laptops
3:2
DSLR photos, 35mm film (1080×720)
5:4
Medium format photography, some monitors
2:1
Univisium cinema format

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About This Tool

Use the Aspect Ratio Calculator to perform quick, accurate calculations right in your browser. Enter your values and get instant results with clear breakdowns. No app installation or account needed — all calculations run locally on your device with full precision.

How to Use

  1. Enter the required values in the input fields.
  2. The results are calculated and displayed in real time as you type.
  3. Review the detailed breakdown and any charts or visualizations.
  4. Copy the results or take a screenshot for your records.

Frequently Asked Questions

How accurate is the Aspect Ratio Calculator?
All calculations use standard mathematical formulas with JavaScript's 64-bit floating-point precision (approximately 15-17 significant digits). Results are accurate for everyday and professional use.
Can I save my calculations?
The tool doesn't store results between sessions. Copy or screenshot results you need to keep. All calculations run in your browser with no server-side storage.
Does this work on mobile devices?
Yes. The calculator is fully responsive and works on smartphones and tablets. Touch-friendly inputs make it easy to use on any screen size.
Is my data private?
Yes. All calculations happen locally in your browser using JavaScript. No data is sent to any server — your inputs and results never leave your device.

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