# Aspect Ratio & Letterbox Calculator

For the full tool, see: [https://capytoolkit.com/tools/math/aspect-ratio/](https://capytoolkit.com/tools/math/aspect-ratio/)

## Aspect Ratio & Letterbox Calculator: Conversions

[Screen Width to Screen Height (16:9)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#width-to-height-16-9): Convert Screen Width to Screen Height (16:9) using the 16:9 aspect ratio formula.
[Screen Height to Screen Width (16:9)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#height-to-width-16-9): Convert Screen Height to Screen Width (16:9) using the 16:9 aspect ratio formula.
[Screen Width to Screen Height (4:3)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#width-to-height-4-3): Convert Screen Width to Screen Height (4:3) using the 4:3 aspect ratio formula.
[Screen Height to Screen Width (4:3)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#height-to-width-4-3): Convert Screen Height to Screen Width (4:3) using the 4:3 aspect ratio formula.
[Screen Width to Screen Height (21:9)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#width-to-height-21-9): Convert Screen Width to Screen Height (21:9) using the 21:9 aspect ratio formula.
[Screen Height to Screen Width (21:9)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#height-to-width-21-9): Convert Screen Height to Screen Width (21:9) using the 21:9 aspect ratio formula.
[Screen Width to Screen Height (16:10)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#width-to-height-16-10): Convert Screen Width to Screen Height (16:10) using the 16:10 aspect ratio formula.
[Screen Height to Screen Width (16:10)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#height-to-width-16-10): Convert Screen Height to Screen Width (16:10) using the 16:10 aspect ratio formula.
[Screen Width to Screen Height (3:2)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#width-to-height-3-2): Convert Screen Width to Screen Height (3:2) using the 3:2 aspect ratio formula.
[Screen Height to Screen Width (3:2)](https://capytoolkit.com/tools/math/aspect-ratio/conversions/#height-to-width-3-2): Convert Screen Height to Screen Width (3:2) using the 3:2 aspect ratio formula.

## Calculator Guides

[Aspect Ratio & Letterbox Calculator: Width, Height, and Ratio in Seconds](https://capytoolkit.com/tools/math/aspect-ratio/aspect-ratio-calculator/): Free aspect ratio calculator. Enter width and height to get the simplified ratio, scale dimensions, and calculate letterbox bars. Runs in your browser.
[Convert Your Dimensions to 16:9 Above](https://capytoolkit.com/tools/math/aspect-ratio/16-9-aspect-ratio/): Enter any width or height into the calculator above to get the matching 16:9 dimension instantly, from 1280×720 up to 7680×4320, then check the letterbox bars your other content would leave.
[4:3 Aspect Ratio: When and Why It Still Matters](https://capytoolkit.com/tools/math/aspect-ratio/4-3-aspect-ratio/): 4:3 aspect ratio guide. Learn where 4:3 still appears in 2026, Micro Four Thirds cameras, security systems, and legacy broadcast, with pixel dimensions.
[Compare Monitor Aspect Ratios Before You Buy](https://capytoolkit.com/tools/math/aspect-ratio/monitor-aspect-ratio/): Compare 16:9, 16:10, 21:9, and 32:9 monitors by resolution and content compatibility, then calculate your own letterbox bar sizes above before you buy or export.
[Video Aspect Ratios: From HD to Vertical for Every Platform](https://capytoolkit.com/tools/math/aspect-ratio/video-aspect-ratio/): Video aspect ratio guide for every platform. Compare 16:9, 9:16, 1:1, 4:5, and 2.39:1 CinemaScope with pixel dimensions and platform export settings.
[Social Media Aspect Ratios: 9:16, 4:5, and 1:1 for 2026](https://capytoolkit.com/tools/math/aspect-ratio/social-media-aspect-ratio/): Social media aspect ratio guide for 2026. Platform-by-platform requirements for TikTok, Instagram, YouTube, LinkedIn, and Facebook with exact pixel dimensions.
[Check Your Ultrawide Display: 21:9 and 32:9](https://capytoolkit.com/tools/math/aspect-ratio/ultrawide-aspect-ratio/): Confirm which pixel dimensions your 21:9 or 32:9 ultrawide actually uses, then check the pillar bar sizes above before you buy a monitor or export a video.
[Photo and Print Aspect Ratios: 3:2, 4:3, and 4:5](https://capytoolkit.com/tools/math/aspect-ratio/photo-print-aspect-ratio/): Photo and print aspect ratio guide. Match camera sensor ratios to standard print sizes, calculate crops for 3:2, 4:3, 4:5, and square formats.

## Aspect Ratio & Letterbox Calculator Reference

[What Is 16:9?](https://capytoolkit.com/tools/math/aspect-ratio/reference/#what-is-16-9): Definition of the 16:9 aspect ratio. Includes common pixel dimensions, history as the HDTV standard, and a browser-based calculator for 16:9 conversions.
[What Is 4:3?](https://capytoolkit.com/tools/math/aspect-ratio/reference/#what-is-4-3): 4:3 aspect ratio guide. Learn where 4:3 still appears in 2026: Micro Four Thirds cameras, security systems, and legacy broadcast.
[What Is 21:9?](https://capytoolkit.com/tools/math/aspect-ratio/reference/#what-is-21-9): Definition of the 21:9 ultrawide aspect ratio. Actual pixel dimensions (2560×1080, 3440×1440), true ratios (64:27, 43:18), and letterbox calculations.
[What Is Letterboxing?](https://capytoolkit.com/tools/math/aspect-ratio/reference/#what-is-letterboxing): Definition of letterboxing. Explains why horizontal black bars appear when wide content plays on narrow screens, with a browser calculator for exact bar sizes.
[What Is Pillarboxing?](https://capytoolkit.com/tools/math/aspect-ratio/reference/#what-is-pillarboxing): Definition of pillarboxing. Explains why vertical black bars appear when tall content plays on wide screens, with a browser calculator for exact bar widths.

## Displays

[Samsung Odyssey OLED G9 (G95SC)](https://capytoolkit.com/tools/math/aspect-ratio/samsung-odyssey-g9-g95sc/): 32:9 aspect ratio guide for the Samsung Odyssey OLED G9 G95SC. Letterbox bar calculations, game compatibility, and scaling 16:9 content on 5120×1440.
[LG 34WP65C-B](https://capytoolkit.com/tools/math/aspect-ratio/lg-34wp65c-b/): 21:9 aspect ratio guide for the LG 34WP65C-B. Bar calculations for 16:9 content, motion blur at medium overdrive, and fractional-scaling settings.
[Dell S2725QS](https://capytoolkit.com/tools/math/aspect-ratio/dell-s2725qs/): Dell S2725QS aspect ratio guide. 16:9 at 3840×2160 explained: fractional scaling options, 4K content compatibility, and letterbox calculations.
[BenQ RD280U](https://capytoolkit.com/tools/math/aspect-ratio/benq-rd280u/): BenQ RD280U aspect ratio guide. 3:2 at 3840×2560 explained: letterbox bars for 16:9 video, game compatibility issues, and Windows fractional scaling.
[Dell Alienware AW2725Q](https://capytoolkit.com/tools/math/aspect-ratio/dell-alienware-aw2725q/): Dell Alienware AW2725Q aspect ratio guide. 4K 16:9 at 3840×2160 and 240 Hz QD-OLED: content scaling, burn-in considerations, and bar size calculations.