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Aspect Ratio Calculator - Free Online Ratio Tool | IconVault

Simplify aspect ratios (16:9, 4:3, 21:9) and scale dimensions proportionally for video, thumbnails, and design. Free, runs in your browser.

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Aspect Ratio Calculator

Simplify ratios and resize proportionally

5 of 5 free uses left

Presets

Dimension solver

Fill in one box to find the missing dimension at the current ratio.

Height for width 1280: 720

5 of 5 free copies left - runs fully on your device.

Simplified ratio

16 : 9

1920 x 1080

CSS output

.box {
  aspect-ratio: 16 / 9;
}

/* Legacy padding-bottom hack */
.box::before {
  content: "";
  display: block;
  padding-bottom: 56.25%;
}

About this tool

IconVault's Aspect Ratio Calculator simplifies any width and height to its lowest-terms ratio, like 16:9 or 4:3, and resizes one dimension while keeping the other proportional. It shows the GCD-based simplified ratio plus common preset ratios for video, social, and print.

Use it before resizing images, encoding video, or setting canvas sizes so nothing comes out stretched or cropped. Free and runs fully in your browser.

Frequently asked questions

Popular searches

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