Retro Console Aspect Ratio & Scaling Calculator

How to calculate Pixel Perfect Scaling?

Pixel perfection requires Integer Scaling where the source resolution is multiplied by a whole number to fit the target screen height.

Formula: Scale = floor(Display Height / Console Height)

Using the Scaling Calculator: an example

Example: Running an NES (240p) on a 1080p monitor.

Step-by-step calculation:

1. Identify vertical height (240px).
2. Divide 1080 by 240 (4.5).
3. Round down to the nearest integer (4x).
4. Resulting height is 960px with 60px black bars.

Frequently Asked Questions

What is shimmering?

Shimmering occurs when non-integer scaling causes pixels to have unequal sizes, creating a vibrating effect during motion.

Why use 4:3 instead of 1:1?

Most retro consoles were designed for CRT TVs which stretched the internal pixels to a 4:3 display aspect ratio.