Aspect Ratio Calculator
Calculate, convert & visualize aspect ratios for video, images and displays
Aspect Ratio Calculator
Calculate & convert ratios for video, images and displays
Aspect Ratio
How to Use
- 1 Enter width and height to calculate the aspect ratio
- 2 Or select a platform preset (YouTube, Instagram, TikTok)
- 3 Use "Lock Ratio" to resize while maintaining proportions
- 4 Copy the dimensions or ratio for your project
- 5 View the visual preview to see the proportion
What You Get
Instant aspect ratio calculator that converts between width/height and ratio formats. Includes presets for YouTube (16:9), Instagram (1:1, 4:5, 9:16), TikTok (9:16), Twitter, and cinema formats. Visual preview shows proportions in real-time.
Input: 1920 × 1080
Output: 16:9 (1.778:1)
Input: 1080 × 1350
Output: 4:5 (Instagram Portrait)
Input: 16:9 + Width: 1280
Output: Height: 720
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height of an image or video. It's expressed as two numbers separated by a colon (e.g., 16:9). A 16:9 ratio means for every 16 units of width, there are 9 units of height.
What aspect ratio does YouTube use?
YouTube uses 16:9 as the standard aspect ratio. The recommended resolution is 1920×1080 (1080p) or higher like 3840×2160 (4K). YouTube Shorts use 9:16 vertical format at 1080×1920.
What is the best aspect ratio for Instagram?
Instagram supports multiple ratios: Square posts (1:1) at 1080×1080, Portrait posts (4:5) at 1080×1350 for maximum feed visibility, Stories and Reels (9:16) at 1080×1920, and Landscape (1.91:1) at 1080×566.
What aspect ratio is TikTok?
TikTok uses 9:16 vertical aspect ratio. The recommended resolution is 1080×1920 pixels. This maximizes screen space on mobile devices and creates an immersive viewing experience.
How do I calculate aspect ratio from dimensions?
Divide both width and height by their Greatest Common Divisor (GCD). For example, 1920÷120 = 16 and 1080÷120 = 9, giving you 16:9. Our calculator does this automatically.
What is 16:9 in pixels?
Common 16:9 resolutions: 1920×1080 (Full HD), 2560×1440 (2K/QHD), 3840×2160 (4K UHD), 1280×720 (HD). Any dimensions where width÷height = 1.778 are 16:9.
What is 4:3 aspect ratio used for?
4:3 was the standard for old TVs and monitors. It's still used for some presentations, older photos, and certain professional video formats. Common resolutions: 1024×768, 1600×1200.
How do I resize without changing aspect ratio?
Lock the aspect ratio and change only one dimension (width or height). The other dimension will be calculated automatically to maintain the same proportions.
100% client-side processing. Your dimensions and calculations never leave your device.