Aspect Ratio & Screen Resolution Calculator
Calculate and scale proportional dimensions for video editing, responsive web design, and social media media uploads. Real-time visual box preview with zero distortion.
An aspect ratio defines the proportional relationship between the width and height of an image, video, or digital display ($W:H$). When scaling a digital asset without distortion or letterboxing, the cross-multiplication formula guarantees strict mathematical preservation:
New Height = (Original Height × New Width) ÷ Original Width
1. 2026 Social Media Aspect Ratio & Dimension Cheat Sheet
Different platforms optimize for specific mobile viewport constraints. The reference guide below lists modern digital publishing standards:
Companion Image & Design Tools:
Prepare and optimize your media assets in your browser:
Frequently Asked Questions (FAQ)
How is aspect ratio calculated mathematically?
Aspect ratio expresses the proportional relationship between width and height (Width:Height). To find a new height while preserving proportion: New Height = (Original Height × New Width) ÷ Original Width. To find a new width: New Width = (Original Width × New Height) ÷ Original Height.
What is the aspect ratio for TikTok, Reels, and YouTube Shorts?
Vertical short-form video uses a 9:16 aspect ratio. The standard high-definition resolution is 1080 × 1920 pixels, with 2160 × 3840 pixels for 4K vertical video.
What is the difference between 16:9 and 4:3?
16:9 is the standard widescreen format for modern televisions, computer monitors, and YouTube videos (e.g. 1920×1080). 4:3 is the classic square-ish format used by older television broadcasts and vintage displays (e.g. 1024×768).
What is the best aspect ratio for Instagram feed posts?
Instagram supports 1:1 square (1080 × 1080 px) and 4:5 vertical portrait (1080 × 1350 px). 4:5 is recommended because it occupies the maximum vertical screen space on mobile devices.