Aspect Ratio Calculator Online
Calculate aspect ratios for images and videos. Find height/width for 16:9, 4:3, 1:1. Perfect for social media templates.
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About Aspect Ratio Calculator
Calculate width, height, or aspect ratio from any two given values. Supports common presets: 16:9 (YouTube/TV), 9:16 (Instagram Reels/Stories), 4:3 (standard), 1:1 (Instagram square), 4:5 (Instagram portrait). Shows all resolutions for the chosen ratio.
Aspect ratio is one of the most important concepts in digital media production. Wrong aspect ratios cause black bars in YouTube videos, cropped images on Instagram, and distorted graphics in presentations. This tool is used by social media managers, video editors, graphic designers, and web developers to instantly calculate the correct dimensions.
How to use
- Paste or type your input directly into the editor — output updates in real time as you work.
- Check the error/status indicator if your input is invalid; it points to the exact line or issue where relevant.
- Use the copy or download button to grab the processed output once it looks right.
- Chain into a related tool below if your workflow needs a second processing step.
- Processing happens entirely client-side in your browser — nothing you paste is uploaded to a server.
Tool details
⚡ Next step — complete your workflow
Frequently asked questions
Instagram post dimensions 2026?
Square: 1080×1080 (1:1). Portrait: 1080×1350 (4:5). Landscape: 1080×566 (1.91:1). Reels/Stories: 1080×1920 (9:16).
What resolution is Full HD?
1920×1080 pixels (16:9 aspect ratio, 2.07 megapixels). 4K = 3840×2160 (also 16:9, 8.29 megapixels).
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