Math & Numbers
Aspect Ratio Calculator
Calculate missing dimensions while preserving aspect ratio. Scale images and videos to any size.
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Calculate any aspect ratio and find a missing dimension instantly. Perfect for resizing images, setting video dimensions, or designing responsive layouts — with popular presets for 16:9, 4:3, and 1:1.
Features
Dimension Calculator
Enter width and height to get the ratio, or enter ratio + one dimension to get the other.
Common Presets
One-click presets for 16:9 (widescreen), 4:3 (standard), 1:1 (square), 21:9 (ultrawide), 9:16 (portrait).
Visual Preview
See a scaled visual representation of the aspect ratio.
Scale Table
View a table of common pixel dimensions for the selected ratio.
How to Use
- Enter width and height to calculate the ratio.
- Or select a preset ratio (16:9, 4:3, etc.).
- Enter one dimension to calculate the other.
- Reference the scale table for common sizes.
FAQ
What is 16:9 in pixels?▾
Common 16:9 resolutions include 1920×1080 (Full HD), 1280×720 (HD), and 3840×2160 (4K UHD).
What aspect ratio is best for social media?▾
1:1 (square) for Instagram posts, 9:16 (portrait) for Stories/Reels, 16:9 (landscape) for YouTube.
Common Aspect Ratios
- 16:9 — YouTube, HDTV, modern monitors
- 4:3 — older TVs, iPad landscape
- 1:1 — Instagram, Facebook posts
- 9:16 — Stories, TikTok, Reels
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