What is the 4:3 aspect ratio?

It means for every 4 units of width there are 3 units of height. Dividing 4 by 3 gives the ratio ≈ 1.3333. This was the standard for analog television, early computer monitors, and many digital cameras.

How do I calculate the height from a given width?

Multiply the width by 3 and then divide by 4. For example, a width of 1024 px gives a height of 1024 × 3 / 4 = 768 px.

How do I calculate the width from a given height?

Multiply the height by 4 and then divide by 3. For example, a height of 600 px gives a width of 600 × 4 / 3 = 800 px.

What are common 4:3 resolutions?

640×480 (VGA), 800×600 (SVGA), 1024×768 (XGA), and 1600×1200 (UXGA) are the most common 4:3 resolutions.

Does this tool work in units other than pixels?

Yes. The 4:3 ratio is dimensionless, so the same math applies to centimeters, inches, millimeters, or any other unit. Just treat the numbers as your chosen unit.

Why was 4:3 the original TV and monitor standard?

The 4:3 ratio was inherited from early film formats and became the global standard for analog broadcast television. It remained dominant for computer monitors until widescreen 16:9 displays took over in the late 2000s.

4:3 Aspect Ratio Calculator

Name: 4:3 Aspect Ratio Calculator
Availability: InStock
Author: Nham Vu

Enter a width or height and instantly get the matching 4:3 dimension.

Enter a Dimension

Width

Height (computed)

Common Presets

Result

Enter a dimension to see the result.

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Summary

Enter a width or height and instantly get the matching 4:3 dimension.

How it works

Choose whether you know the width or the height.
Type the known dimension into the input field.
The calculator instantly computes the missing dimension using the 4:3 ratio.
Common presets (VGA, SVGA, XGA, UXGA) are provided for one-click filling.
Copy either dimension to your clipboard with one click.

Use cases

Calculate the correct height for a 1024 px wide presentation slide.
Find the width for an 800 px tall legacy monitor layout.
Verify that a scanned document or photo is true 4:3.
Size PowerPoint or Keynote slides for older projectors.
Ensure retro-style game assets maintain correct fullscreen proportions.
Set up video export settings for standard-definition content.
Design iframes or embedded content targeting classic display ratios.
Convert non-standard dimensions to the nearest 4:3 equivalent.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu