4:3 Aspect Ratio Calculator
Quickly calculate matching dimensions and verify whether a size is true 4:3.
Check an Existing Size
What is a 4:3 calculator?
A 4:3 calculator helps you keep the classic 4:3 aspect ratio when resizing images, videos, slides, game captures, or display layouts. In a 4:3 ratio, for every 4 units of width, there are 3 units of height. This tool removes guesswork and gives you exact dimensions instantly.
How to use this 4 3 calculator
1) Calculate matching dimensions
- Select whether you know the width or the height.
- Enter the value in any unit (pixels, inches, cm, etc.).
- Click Calculate 4:3 Size to get the matching side.
2) Check if a size is truly 4:3
- Enter both width and height.
- Click Check Ratio.
- The tool tells you whether it is exact 4:3 and shows the percentage difference.
4:3 formula
These are the core equations used by the calculator:
- Height = Width × 3 ÷ 4
- Width = Height × 4 ÷ 3
- Ratio check = Width ÷ Height (should equal 1.3333...)
Common 4:3 resolutions
If you need practical presets, these are widely used 4:3 sizes:
- 640 × 480
- 800 × 600
- 1024 × 768
- 1152 × 864
- 1280 × 960
- 1400 × 1050
- 1600 × 1200
- 2048 × 1536
Why 4:3 still matters
Even in a widescreen world, 4:3 remains useful. Many classrooms, legacy projectors, archival photos, industrial displays, and retro gaming workflows still rely on this format. If your content is not sized correctly, it can appear stretched, squashed, or letterboxed.
Using a dedicated 4 3 calculator helps you preserve visual quality, avoid rework, and keep output consistent across devices. It is especially helpful for designers, video editors, teachers, and streamers working with mixed media.
FAQ
Is 1024 × 768 a 4:3 resolution?
Yes. 1024 ÷ 768 = 1.3333..., which is exactly 4:3.
Can I convert 16:9 to 4:3 without distortion?
Yes, but you usually need to crop or add bars. Stretching to force 4:3 will distort the image. This calculator helps you choose proper target dimensions first.
Can I use units other than pixels?
Absolutely. Aspect ratio is unit-independent, so the same math works for pixels, inches, centimeters, or meters.