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Creator and design calculator

Aspect Ratio Calculator

Calculate matching width or height for 16:9, 9:16, 1:1, 4:5, 21:9, and custom ratios.

Calculate aspect ratio

Choose a preset or enter a custom ratio, then change width or height to calculate the matching dimension.

Result

1920 × 1080

16:9 ratio

Common uses

16:9

YouTube videos, widescreen banners, presentations, and HD/4K displays.

9:16

TikTok, Reels, Shorts, stories, and vertical mobile video.

4:5

Portrait social feed posts where you want more vertical space than square.

Content cluster

Related guides

Use these supporting guides to understand the tool result and next testing steps.

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Aspect Ratio Basics for Creators

Use 16:9, 9:16, 1:1, and 4:5 ratios for videos, stories, banners, thumbnails, and social posts.

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Social Media Image Sizes 2026

Reference common social media image and video dimensions for posts, stories, reels, thumbnails, covers, and ads.

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AI Image Aspect Ratio Guide

Choose practical aspect ratios for AI image prompts, social posts, website heroes, thumbnails, and vertical content.

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View all guides →

Related tools

Continue with another ScreenMetricLab utility.

What Is My Screen Size?

Active

Check your live screen resolution, viewport size, DPR, browser, OS, orientation, color depth, and refresh rate.

Open screen checker →

Viewport Size Checker

Active

Measure the browser viewport and visual viewport that your website can use right now.

Check viewport →

Screen Resolution Checker

Active

Find the physical pixel grid reported by your current display and copy it for QA notes.

Check resolution →
View all related tools →