All Tools VerseAspect Ratio Calculator
Aspect Ratio Calculator and resize proportionally. Free image and video aspect ratio tool.
- Runs in your browser
- Nothing uploaded
- Free, no sign-up
Calculate aspect ratios and resize dimensions proportionally.
Resize proportionally:
How to Use Aspect Ratio Calculator
- Enter the original width and height of your image or video in pixels.
- The tool automatically displays the simplified aspect ratio (e.g., 16:9, 4:3).
- To resize proportionally, enter either a new width or new height.
- The opposite dimension calculates automatically to maintain the aspect ratio.
- Use the calculated dimensions for resizing images or videos without distortion.
Frequently Asked Questions
Is my data secure when using this calculator?
Yes. All calculations happen 100% client-side in your browser. No data is sent to any server.
Is this aspect ratio calculator free?
Absolutely. This tool is completely free with unlimited calculations and no restrictions.
Does this work offline?
Yes, once loaded, you can calculate aspect ratios entirely offline without an internet connection.
What aspect ratios are commonly used?
Common ratios include 16:9 (widescreen), 4:3 (standard), 1:1 (square), 21:9 (ultrawide), and 9:16 (vertical mobile).
How does proportional resizing work?
When you enter a new width, the height adjusts automatically to maintain the original aspect ratio, preventing distortion.
Can I use this for video dimensions?
Yes, aspect ratio calculations work identically for both images and videos. Enter the resolution dimensions.
What if I need a specific aspect ratio?
Input dimensions that match your target ratio (e.g., 1920×1080 for 16:9), then resize proportionally from there.
Why does my aspect ratio simplify?
The calculator finds the greatest common divisor to simplify ratios (e.g., 1920:1080 becomes 16:9).
Can I calculate ratios for print dimensions?
Yes, enter dimensions in any unit (inches, cm, pixels) as long as both values use the same unit.
What happens if I change both width and height?
The tool recalculates based on the last value you entered, maintaining proportions from the original dimensions.
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