Pixel to Aspect Ratio Calculator
Find the aspect ratio of your screen or image by entering width and height in pixels.
Why Calculate Aspect Ratio from Pixels?
The aspect ratio of a screen or image describes its proportional relationship between width and height. For example, a 1920 × 1080 screen has a 16:9 aspect ratio. Calculating aspect ratio from pixels is crucial when:
- Matching projectors and screens for presentations or home theaters
- Ensuring video content displays correctly without distortion
- Designing graphics that fit standard formats
- Checking compatibility between monitors, laptops, and mobile devices
Formula
Aspect Ratio = Width ÷ GCD(Width, Height) : Height ÷ GCD(Width, Height)
Where GCD is the greatest common divisor of the width and height values.
Example Calculations
Example 1: 1920 × 1080 → GCD = 120 → 16:9
Example 2: 1280 × 1024 → GCD = 256 → 5:4
Example 3: 3840 × 1600 → GCD = 160 → 24:10 (simplified to 12:5)
Common Aspect Ratios
- 16:9: Standard HDTV, projectors, and modern monitors
- 4:3: Older TVs, some tablets, and projectors
- 21:9: Ultra-wide monitors and cinematic screens
- 3:2: Laptops and tablets
- 1:1: Square screens or Instagram posts
FAQs
Why does my monitor resolution give a strange ratio?
Some resolutions don’t correspond to common aspect ratios, especially with ultra-wide or custom screens. The calculator will still give you the exact ratio.
Can I use this calculator for videos?
Yes. Video files also have pixel dimensions, and you can use this tool to determine their aspect ratio.
What happens if my ratio doesn’t match 16:9?
Your image or video may display with black bars or get cropped to fit screens with a different ratio.
Conclusion
Use the Pixel to Aspect Ratio Calculator to quickly determine the exact aspect ratio of any screen or image. Whether for home theaters, graphic design, or video production, knowing the correct ratio ensures your content always looks its best.