Calculate aspect ratios for images and videos
16:9
Ratio
1.7778
Decimal
Calculate aspect ratios for images and videos online free. Enter width and height to get the ratio as a simplified fraction such as 16:9 and as a decimal value. Scale dimensions while maintaining the same aspect ratio by entering a new width to calculate the proportional height, or entering a new height to calculate the proportional width. Useful for responsive web design, video production, social media image sizing, thumbnails, UI mockups, and print layout planning.
Aspect ratios are fundamental to visual design. Maintaining the correct ratio prevents distortion when scaling images or videos. Web developers need to know ratios for responsive images and video embeds. Video producers need to match platform requirements (YouTube is 16:9, Instagram Stories is 9:16). Photographers need to crop images to specific ratios for printing. Designers need to scale mockups proportionally without distortion.
16:9 (1.778) — HD/4K video, YouTube, most monitors. 4:3 (1.333) — traditional TV, iPad. 1:1 — Instagram square posts, profile pictures. 9:16 (0.5625) — Instagram/TikTok Stories, vertical video. 3:2 (1.5) — DSLR photos, 35mm film. 21:9 (2.333) — ultrawide monitors, cinematic video. 1.91:1 — Facebook/LinkedIn link previews. A4 paper: 1:1.414 (√2).
Changing width or height independently can stretch faces, distort product images, crop UI screenshots poorly, or make video thumbnails look unprofessional. Keeping the same ratio preserves the original composition while resizing for a different platform or layout. This is especially important when preparing responsive images, embedded videos, ad creatives, product photos, and social media assets.
Start with the platform requirement, then calculate the missing dimension instead of guessing. For example, if a video thumbnail must be 1280 pixels wide and the source is 16:9, calculate the height as 720. For vertical content, enter the required height first and let the calculator return the matching width. Always review the final crop in your design or publishing tool before uploading.
Aspect Ratio Calculator Online Free is useful when you need to complete a focused task quickly without installing desktop software, creating another account, or switching into a heavy workflow. It works well for quick checks, conversions, previews, cleanups, generation tasks, and everyday operations where speed and consistency matter. Calculate aspect ratios for images and videos online free. Enter width and height to get the ratio as a simplified fraction such as 16:9 and as a decimal value. Scale dimensions while maintaining the same aspect ratio by entering a new width to calculate the proportional height, or entering a new height to calculate the proportional width. Useful for responsive web design, video production, social media image sizing, thumbnails, UI mockups, and print layout planning.
Start with a small sample so you understand how Aspect Ratio Calculator Online Free handles your input, then apply it to the full task. Review the important fields, copy or export the result, and test it in the place where you plan to use it. This keeps the tool fast while still giving you a practical quality-control step before production use.
16:9 is the standard widescreen aspect ratio used for HD and 4K video, most monitors, and YouTube. 1920×1080 and 3840×2160 are both 16:9.
Instagram posts: 1:1 (square) or 4:5. Stories/Reels: 9:16. Twitter/X: 16:9. Facebook: 1.91:1.
Enter the new width and click '→ H' to calculate the proportional height, or enter the new height and click '→ W' for the width.
4:3 is the traditional TV and monitor aspect ratio. Common resolutions: 640×480, 800×600, 1024×768.
A4 paper is 210×297mm, giving an aspect ratio of approximately 1:1.414 (√2). This is the ISO 216 standard used for most paper sizes.
Yes. Aspect Ratio Calculator Online Free is designed as a free browser-based utility for quick personal, learning, and professional workflows.
No. You can use Aspect Ratio Calculator Online Free directly in a modern browser such as Chrome, Edge, Safari, or Firefox.
Yes. The page is responsive and can be used on phones and tablets, although desktop is usually more comfortable for long input or repeated copy operations.
Use clean input, test with a small sample first, review the output carefully, and adjust any details that depend on your final use case.
In most cases, yes. You can use the generated or processed output in personal and commercial projects, but legal, financial, medical, or security-sensitive work should still be reviewed by a qualified person.
The tool is built for quick browser workflows. You should still avoid entering highly sensitive data unless the specific tool clearly states how the data is handled.
Many tools include copy or download actions. If a dedicated export is not available, you can usually copy the visible result manually.
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