Guide
This aspect ratio calculator simplifies W:H and converts new dimensions while keeping proportions, useful for image/video sizing, screen resolutions, and proportional scaling.
Features
Auto-simplify the ratio from width and height in real time.
Built-in presets like 16:9, 4:3, and 9:16 for quick selection.
Custom ratio support and automatic height calculation based on current width.
Convert by new width or new height to avoid stretching.
Proportional scaling results and a handy reference list for common sizes.
How to Use
Enter the original width and height to see the simplified aspect ratio.
Pick a preset or enter a custom ratio and click Apply.
Type a new width to calculate the matching height with the same ratio.
Type a new height to calculate the matching width with the same ratio.
Choose a scale percentage to get scaled dimensions instantly.
Use Cases
Scenarios
Prepare covers and assets for 16:9, 9:16, and other platform ratio requirements.
Compute target dimensions before resizing or exporting images and videos.
Derive the missing side in UI design and frontend development without distortion.
Compare common resolutions and aspect ratios for display selection.
Tips
Use integer dimensions when possible to reduce rounding differences.
When only one side is known, convert by width/height to keep proportions.
Presets are great for standard specs; custom ratios help with special framing.
FAQ
Why are results rounded? Pixel-based sizes are typically integers, so values are rounded for practical use.
Aspect ratio vs resolution: resolution is the exact size, ratio is the proportional relationship.
How to avoid distortion? Always convert using the same W:H ratio when resizing.
Privacy
All calculations run locally in your browser. No sizing data is uploaded or stored.
FAQ
Are the results accurate?
This tool follows common calculation rules. For formal or business scenarios, please verify with your actual rules.
Will my input be uploaded?
No. Processing is performed locally in your browser by default.