Aspect Ratio Calculator
Calculate equivalent dimensions while maintaining a specific aspect ratio.
16:9
Widescreen (HD/4K)
1920 × 1080
How it works
Enter a width and height and the tool calculates the simplified aspect ratio (e.g. 1920×1080 → 16:9). Or enter a ratio and one dimension to calculate the other. Instantly see all equivalent resolutions for your aspect ratio.
Why use this tool?
Video editors, UI designers, and photographers use aspect ratio calculators to ensure images and videos fit correctly on screens, banners, and social media without stretching or cropping.
Frequently Asked Questions
What is a 16:9 aspect ratio?
16:9 is the standard widescreen ratio used by most monitors, TVs, YouTube videos, and presentations. For every 16 units of width, there are 9 units of height. Common resolutions include 1920×1080 and 3840×2160 (4K).
What is the difference between 4:3 and 16:9?
4:3 is the older standard-definition TV ratio (square-ish). 16:9 is the modern widescreen ratio. Content shot in 4:3 appears with black bars on the sides when viewed on a 16:9 screen.
How do I maintain aspect ratio when resizing?
Enter a width and the tool calculates the correct height. Locking the ratio means if you change one dimension, the other adjusts proportionally to prevent stretching.
Is this free?
Yes, completely free with instant calculation. No sign-up needed.
Rate this tool:
Was this tool helpful?