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Seitenverhältnis-Rechner.

Calculate and scale image/video dimensions while maintaining aspect ratio

On-device calculationNo signup
01

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Results update as you type.

Original Dimensions

16:9
Widescreen (HD)
Decimal: 1.778
16:9

Calculate New Size

FAQs

Was ist Seitenverhältnis?

Seitenverhältnis ist das proportionale Verhältnis zwischen Breite und Höhe eines Bildes oder Bildschirms.

Was ist das Standard-Breitbildformat?

16:9 ist das Standard-Breitbildformat für HD-Fernseher und moderne Displays.

Cite this calculator

Canonical URL: https://mathify.one/de/creative/aspect-ratio

Cite as: Mathify. (2026). Seitenverhältnis-Rechner. https://mathify.one/de/creative/aspect-ratio

Use Cases

Resize images for social media

Ensure your images fit platform-specific aspect ratios without cropping or stretching. Enter the original dimensions and the target width or height to get the exact other dimension.

Example: Original 1200x800, target width 600 → height becomes 400.

Scale video dimensions for different screens

When adapting video content for various devices, maintain the correct aspect ratio to avoid black bars or distortion. Use the calculator to find the proportional height or width.

Example: Original 1920x1080, target height 720 → width becomes 1280.

Frequently Asked Questions

How do I use the aspect ratio calculator?
Enter the original width and height of your image or video. Then, enter either a target width or target height. The calculator will automatically compute the missing dimension to maintain the same aspect ratio, ensuring your media scales proportionally without distortion.
What are common aspect ratios like 16:9 and 4:3?
16:9 is the standard widescreen format for HDTV and most online videos. 4:3 is the traditional TV and computer monitor format. 1:1 is a square, often used for social media profile pictures. The calculator includes these presets and also allows custom ratios.
Can I use this calculator for any image or video?
Yes, as long as you know the original width and height. It works for images, videos, screens, and any rectangular object. Simply input the original dimensions and your desired target dimension to get the proportional counterpart.

Tips & Common Mistakes

Tips

  • Always double-check the original dimensions before entering them to ensure accurate scaling.
  • If you know the desired aspect ratio (like 16:9) but not the exact dimensions, you can use the preset to guide your target width or height.
  • For print projects, consider the resolution (DPI) in addition to aspect ratio to maintain quality.
  • When resizing, keep the aspect ratio locked in your editing software to avoid accidental distortion.

Common Mistakes to Avoid

  • Entering the target width and height both, which may not match the original ratio, causing distortion. Only enter one target dimension.
  • Confusing width and height, especially when the orientation is portrait vs landscape. Always verify which dimension is which.
  • Assuming that a larger target dimension always means a larger file size; aspect ratio does not determine file size directly.

Last updated: August 13, 2026