---
title: "Free Aspect Ratio Calculator"
description: "Calculate aspect ratios, lock proportions, and see pixel dimensions for common resolutions. Presets for 1:1, 16:9, 9:16, and more. No signup required."
url: "https://adaptlypost.com/free-tools/aspect-ratio-calculator"
---

# Free Aspect Ratio Calculator

Calculate aspect ratios, lock proportions, and see pixel dimensions for common resolutions. Essential for video, image, and responsive design work.

100% free, no account needed

## Interactive tool

Common Presets

Width (px)

Height (px)

### 16:9

1920 x 1080 px

### Resolution Table

| Width (px) | Height (px) | Height    |
| ---------- | ----------- | --------- |
| 320px      | 180px       | 57,600    |
| 640px      | 360px       | 230,400   |
| 768px      | 432px       | 331,776   |
| 1024px     | 576px       | 589,824   |
| 1280px     | 720px       | 921,600   |
| 1440px     | 810px       | 1,166,400 |
| 1920px     | 1080px      | 2,073,600 |
| 2560px     | 1440px      | 3,686,400 |
| 3840px     | 2160px      | 8,294,400 |

## Free Aspect Ratio Calculator Features

Calculate and lock aspect ratios for any dimension

### Auto Calculation

Enter width and height to instantly see the simplified aspect ratio.

### Lock Proportions

Lock the ratio and change one dimension, the other auto-calculates.

### 7 Common Presets

Quick access to 1:1, 4:3, 16:9, 9:16, 4:5, 2:3, and 21:9.

### Resolution Table

See pixel dimensions for 9 common widths at your chosen ratio.

## FAQ

### What aspect ratio should I use for social media?

1:1 for Instagram feed, 9:16 for Stories/Reels/TikTok, 16:9 for YouTube, 4:5 for Instagram portrait posts, 2:3 for Pinterest.

### How is the ratio calculated?

We find the greatest common divisor (GCD) of width and height, then divide both by the GCD to get the simplest ratio.

### What does 'lock ratio' do?

When locked, changing the width automatically recalculates the height (and vice versa) to maintain the current aspect ratio.

## Keep going with AdaptlyPost

[Create visuals with the AI Image Studio](https://adaptlypost.com/features/ai-social-media-image-generator)[Schedule posts across every platform](https://adaptlypost.com/features/ai-social-media-scheduler)

## Create Perfectly Sized Content

Use AdaptlyPost's image tools for platform-perfect posts.

[Get Started Free](https://adaptlypost.com/signup)