Aspect Ratio Calculator – Quick Guide

Need a frame size fast? Use the aspect ratio calculator and keep this cheat sheet open.

Basics

Aspect ratio equals width divided by height. 16:9 stays 16:9 whether the pixels are 1280x720 or 3840x2160.

Common ratios

• 16:9 for landscape video and presentations
• 9:16 for vertical clips on TikTok, Shorts, and Reels
• 1:1 or 4:5 for square and portrait social posts
• 2.39:1 when you need a cinema scope look

How to get the missing side

Open the ratio calculator. Enter the width or height you know, pick a preset, and press Calculate.

Example: enter 3840 for width, choose 9:16, and the tool shows 2160 for height.

Ready-to-use sizes

• 16:9: 1920x1080 or 3840x2160
• 9:16: 1080x1920
• 1:1: 1080x1080
• 4:5: 1080x1350
• 2.39:1: 4096x1716 or 2048x858

Tips

Lock the ratio before you shoot or export. Save the calculator result in your project notes or export preset.