Aspect Ratio Calculator

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

1. Enter the original width and height to see the simplified aspect ratio.
2. Pick a preset or enter a custom ratio and click Apply.
3. Type a new width to calculate the matching height with the same ratio.
4. Type a new height to calculate the matching width with the same ratio.
5. Choose a scale percentage to get scaled dimensions instantly.

Use Cases

• 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.