Screen Resolution Megapixel Calculator
Calculate the total megapixel count and aspect ratio of a screen resolution such as 1920x1080 or 3840x2160.
Your results
Calculation breakdown
- Megapixels
- (width × height) ÷ 1,000,000
- Aspect ratio
- width ÷ GCD : height ÷ GCD
Worked example
A 3840x2160 (4K) resolution has 3840 × 2160 = 8,294,400 pixels, or about 8.29 megapixels, at a 16:9 aspect ratio.
Assumptions
- Assumes square, non-interlaced pixels.
How this calculator works
Enter a screen's horizontal and vertical pixel count to see the total megapixel count and simplified aspect ratio, useful for comparing monitors, TVs and cameras.
Frequently asked questions
How many megapixels is 4K?
A standard 3840x2160 4K resolution is about 8.3 megapixels, roughly four times a 1080p (1920x1080) screen.
Is a higher resolution always better?
Not necessarily — it depends on screen size and viewing distance; very high resolutions on small screens give diminishing visible benefit.
What is the aspect ratio of most monitors?
Most desktop monitors and TVs use 16:9; ultrawide monitors commonly use 21:9.
Editorial review and responsibility
Reviewed by the CalcAussie editorial team on 21 September 2026. Review scope: Method, Australian terminology, material assumptions, source links and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.