Aspect Ratio Calculator - Calculate Dimensions & Screen Ratios Online
Easily calculate and resize image, video, and display aspect ratios (16:9, 4:3, 21:9, 1:1) without visual distortion.
This tool runs in your browser.
Your result will appear here.
How to use
- 01Enter original width and height, or choose common presets like 16:9 or 4:3.
- 02Type a new target width or height; the opposing dimension calculates automatically.
- 03Copy the scaled resolution values or aspect ratio formula instantly.
FAQ
What are standard video and display aspect ratios?
Standard ratios include 16:9 for modern HD video and displays, 4:3 for vintage screens, 21:9 for ultrawide cinema, and 1:1 for social avatars.
How do I scale dimensions while preserving aspect ratios?
Input your original width and height or pick a preset, then adjust one dimension. The calculator scales the opposing side proportionally without stretching.
Is any software installation required?
No. Calculations run instantly client-side using native math operations in your web browser with zero server latency.