Practical

Aspect Ratio Calculator

Common Presets

Original Width (px)

Original Height (px)

Scale to New Size (enter one)

New Width

New Height

What is Aspect Ratio Calculator?

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An aspect ratio calculator determines the proportional relationship between width and height, expressed as W:H. It lets you scale dimensions while preserving the original ratio to prevent distortion.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

Formula

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f(x)Scale by width: New Height = Original Height × (New Width ÷ Original Width)

How to Aspect Ratio Calculator

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1Aspect Ratio = Width : Height, simplified by dividing both by their GCD
2GCD (Greatest Common Divisor) found using the Euclidean algorithm
3Scale by width: New Height = Original Height × (New Width ÷ Original Width)
4Scale by height: New Width = Original Width × (New Height ÷ Original Height)

Worked Examples

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Example 1

Given:1920 × 1080 pixels

Result:Aspect ratio 16:9 — scale to 1280 wide gives 720 height

Example 2

Given:2560 × 1440 pixels

Result:Aspect ratio 16:9 — scale to 1920 wide gives 1080 height

Example 3

Given:1024 × 768 pixels

Result:Aspect ratio 4:3 — scale to 800 wide gives 600 height

Common Aspect Ratios and Uses

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Ratio	Common Name	Typical Use
16:9	Widescreen	HD and 4K TV, YouTube, monitors
4:3	Traditional	Old TVs, tablets, iPad
1:1	Square	Instagram, profile photos
9:16	Portrait	Mobile video, TikTok and Reels
21:9	Ultrawide	Cinema and gaming monitors

Frequently Asked Questions

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What is Aspect Ratio?

An aspect ratio calculator determines the proportional relationship between width and height, expressed as W:H. It lets you scale dimensions while preserving the original ratio to prevent distortion

How accurate is the Aspect Ratio calculator?

The calculator uses the standard published formula for aspect ratio. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Aspect Ratio calculator use?

This calculator works with inches, watts. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Aspect Ratio calculator use?

The core formula is: Aspect Ratio = Width : Height, simplified by dividing both by their GCD. Each step in the calculation is shown so you can verify the result manually.

References

Formula-verified for precision

Reviewed October 2026

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Aspect Ratio Calculator