Video Aspect Ratio Calculator
Enter your video dimensions to calculate the exact aspect ratio, decimal value, and visual shape. Use presets for common platforms.
What Is an Aspect Ratio?
An aspect ratio is the proportional relationship between a video's width and height, expressed as two numbers separated by a colon (e.g., 16:9). It doesn't describe the actual pixel dimensions — a 1920×1080 video and a 3840×2160 (4K) video both have a 16:9 aspect ratio.
The aspect ratio determines the shape of your video: wide like a cinema screen, square like an Instagram post, or tall like a phone held vertically. Choosing the wrong aspect ratio for a platform results in black bars (letterboxing), cropped edges (pillarboxing), or distorted footage.
Aspect Ratios by Platform (2026)
YouTube — 16:9 Widescreen
YouTube's primary format is 16:9, and the player is designed around it. The ideal resolution is 1920×1080 (1080p) for standard uploads, 2560×1440 for 1440p (2K), or 3840×2160 for 4K. Uploading a non-16:9 video adds black bars to fill the widescreen player.
YouTube Shorts uses 9:16 (1080×1920), matching the phone screen orientation. Shorts uploaded in other aspect ratios are cropped to fill the vertical player, often losing important framing. If you shoot Shorts intentionally, frame your subjects in the center vertical third.
TikTok — 9:16 Vertical
TikTok is built entirely around 9:16 vertical video (1080×1920). Videos shot horizontally or in square format are displayed with black bars and perform measurably worse in the algorithm. When shooting for TikTok, flip your phone to portrait orientation and compose your shot for the vertical frame from the beginning.
Instagram supports multiple aspect ratios depending on content type:
- Feed videos: 1:1 (square, 1080×1080) or 4:5 (portrait, 1080×1350). The 4:5 format takes up more screen space in the feed, increasing visibility.
- Reels: 9:16 (1080×1920). Full-screen vertical video.
- Stories: 9:16 (1080×1920). Same as Reels. Avoid placing important content in the bottom 250px (covered by the reply bar) and top 250px (covered by the account name).
Facebook handles multiple aspect ratios but recommends 16:9 (1920×1080) for desktop and 9:16 for mobile-first content. Facebook Reels follow the same 9:16 specification as Instagram Reels.
LinkedIn recommends 16:9 for standard video posts (1920×1080) and 1:1 or 9:16 for mobile feed videos. LinkedIn's audience is primarily on desktop, making 16:9 a safer default than other platforms.
Cinema and Film
Traditional cinema uses 1.85:1 (widescreen) or 2.39:1 (anamorphic scope). The 21:9 format used by ultrawide monitors approximates 2.37:1, close to anamorphic scope. If you're editing a film-style production, shooting in 4K 16:9 and adding 2.39:1 letterbox bars in post gives the cinematic look without cropping your actual capture.
Why Aspect Ratio Matters in Production
Getting aspect ratio right starts at the shooting stage, not in post-production. Reframing 16:9 footage to 9:16 means cropping 44% of the image width, which may work but loses quality and requires your subjects to be centered in the original frame.
If you shoot with the intent to publish on multiple platforms, consider shooting in a taller aspect ratio — 4:3 or even 9:16 — and reframing to 16:9 in post. This preserves more vertical information. Alternatively, enable aspect ratio guides in your camera (most mirrorless cameras support this) to see where 9:16 crops will fall during shooting.
Common Aspect Ratio Quick Reference
| Ratio | Common Resolution | Used For |
|---|---|---|
| 16:9 | 1920×1080 / 3840×2160 | YouTube, TV, monitors, default camera |
| 9:16 | 1080×1920 | TikTok, Reels, Shorts, Stories |
| 1:1 | 1080×1080 | Instagram feed, Facebook |
| 4:5 | 1080×1350 | Instagram feed portrait |
| 4:3 | 1440×1080 | Legacy TV, some cameras |
| 21:9 | 2560×1080 / 3440×1440 | Ultrawide cinema |
| 2.39:1 | 2560×1072 | Anamorphic cinema scope |
| 3:2 | 3000×2000 | 35mm film, DSLRs |
Frequently Asked Questions
16:9 at 1920×1080 (1080p) for standard videos. YouTube Shorts: 9:16 at 1080×1920. Using the correct ratio prevents black bars in the YouTube player.
TikTok uses 9:16 vertical (1080×1920). Square 1:1 works but fills less screen space and performs worse algorithmically.
4:5 (1080×1350) maximizes your real estate in Instagram's feed. It's the tallest ratio Instagram allows for feed posts without cropping to 1:1.
Export your video at the target aspect ratio in your editing software. DaVinci Resolve, Premiere Pro, and Final Cut Pro all allow you to set the project timeline dimensions independently of your source footage. Avoid stretching — always crop or add letterbox bars instead.
16:9 is standard widescreen (1.78:1 decimal). 2.39:1 is anamorphic cinema scope, significantly wider. 2.39:1 creates the ultra-cinematic letterbox look you see in Hollywood films. On a 16:9 timeline, you add black bars top and bottom to simulate this look.