📐 Aspect Ratio Calculator

Aspect ratio calculator. YouTube, Instagram, TikTok presets — free, instant, no signup.

Compute the simplified width-to-height ratio from any pixel dimensions, with instant visual feedback as you type. Preloaded presets cover YouTube (16:9), Instagram (1:1, 4:5), TikTok (9:16), and Twitter formats. A companion scale calculator finds a matching dimension when you know only one side, useful for resizing images and video without distorting proportions.

📋 Social Media Presets

Width (px)

Height (px)

16:9

1920 × 1080

📐 Visual Preview

📏 Scale Calculator

Known Dimension

→

Side

📌 Embed This Tool

Add the Aspect Ratio Calculator to your website for free. Just copy and paste the code below.

<!-- Aspect Ratio Calculator — Embed by ToolStand -->
<div style="position:relative;width:100%;max-width:100%;overflow:hidden;">
  <iframe src="https://toolstand.io/tools/aspect-ratio/embed.html" 
    width="100%" height="500" frameborder="0"
    style="border:1px solid #e2e8f0;border-radius:8px;background:#fff;"
    loading="lazy" 
    title="Aspect Ratio Calculator | ToolStand"
    allow="clipboard-write"
    sandbox="allow-scripts allow-same-origin allow-popups allow-forms">
  </iframe>
</div>

📋 When to Use the Aspect Ratio Calculator

The Aspect Ratio Calculator is perfect for quick calculations when you don't have specialized software installed. Use it when cropping photos for social media, calculating display resolutions, designing responsive layouts, or matching video dimensions to platform requirements (YouTube 16:9, Instagram 1:1 or 4:5, TikTok 9:16). Designers use it to maintain proportions when scaling artwork, photographers to calculate print sizes from pixel dimensions, and developers to compute responsive breakpoints. The calculator finds the greatest common divisor (GCD) to simplify any width:height pair to its lowest terms — no guesswork, instant results.

⚙️ How the Aspect Ratio Calculator Works

The Aspect Ratio Calculator uses the Euclidean algorithm to find the greatest common divisor (GCD) of your width and height, then divides both by the GCD to produce the simplified ratio. For example, 1920×1080 → GCD is 120 → ratio 16:9. The decimal value (width ÷ height) is also shown for quick comparison. Platform presets for YouTube, Instagram, TikTok, and Twitter let you instantly see how your dimensions compare to common standards. An SVG preview box is drawn to scale so you can visualize the proportions before applying them.

How to Use the Aspect Ratio Calculator

Enter your width and height values in pixels, or click a preset like 16:9 or 4:3.
The simplified ratio and visual preview update instantly as you type.
Use the Scale Calculator to find a matching dimension when you know only one side.
Copy the ratio for use in your design or video projects.

Frequently Asked Questions

What is an aspect ratio?

An aspect ratio is the proportional relationship between an image or video's width and height, expressed as two numbers separated by a colon (e.g., 16:9). It determines the shape of the display.

What are the most common aspect ratios?

The most common aspect ratios are 16:9 (HD video, most monitors), 4:3 (older TVs, some tablets), 1:1 (social media squares), and 21:9 (ultrawide cinema).

How does the Scale Calculator work?

The Scale Calculator lets you enter a known dimension (width or height) and calculates the matching dimension that preserves the current aspect ratio. This is useful when resizing images or video for specific displays.

Can I use this for responsive web design?

Yes, designers frequently use aspect ratio calculations to maintain proportions when creating responsive layouts, image containers, and video embeds.