📐 Aspect Ratio Calculator

Simplify ratios and solve missing dimensions.

🔒 100% client-side processing

Width : Height

Simplified ratio

16 : 9

Decimal form

1.778 : 1

How to Use

### Choose a Mode Use Simplify Ratio to reduce a width:height pair, or Solve Dimension to compute a missing side.

### Enter the Ratio Type the ratio terms or click a preset: 16:9, 4:3, 1:1, 21:9, 9:16, or 3:2.

### Enter the Known Side Pick whether to solve for height or width, then type the dimension you already have.

### Read the Result Results update live with 2-decimal precision, plus the exact fraction when the division is not even.

Features

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Ratio Simplification Reduce any width:height pair to lowest terms via GCD — 1920:1080 becomes 16:9.

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Missing Dimension Solver Given a ratio and one side, compute the other in either direction.

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Common Presets One-click presets for 16:9, 4:3, 1:1, 21:9, 9:16, and 3:2.

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Decimal Form See any ratio as a decimal like 1.778:1 for quick comparison.

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Exact Fractions Non-integer results show the exact simplified fraction alongside the 2-decimal value.

Use Cases

### Resize Video Without Distortion Find the correct height when scaling 16:9 footage to a custom width.

### Design Responsive Layouts Keep image and container proportions consistent across breakpoints.

### Identify Screen Ratios Paste any resolution to discover its simplified aspect ratio.

### Crop Photos Precisely Compute exact crop dimensions for 3:2 prints or 1:1 social posts.

Frequently Asked Questions

How do I simplify an aspect ratio like 1920:1080?

Enter the width and height in Simplify Ratio mode. The calculator divides both numbers by their greatest common divisor, so 1920:1080 becomes 16:9 instantly.

How do I find the height for a given width at 16:9?

Switch to Solve Dimension mode, set the ratio to 16:9 (or click the preset), choose 'Height', and enter your width. The matching height is shown rounded to 2 decimals, plus the exact fraction when the division is not even.

What does the decimal form 1.778:1 mean?

It expresses the ratio as width per 1 unit of height. 16:9 equals about 1.778:1, meaning the width is 1.778 times the height.

Can I use decimal dimensions?

Yes for solving dimensions — enter any positive value as the known side. Simplifying a ratio requires whole numbers, since GCD is only defined for integers.