Video Ratio Calculator

Video Aspect Ratio Calculator

Use this calculator to determine the aspect ratio of your video, or to find a missing dimension (width or height) while maintaining the original aspect ratio.

1. Simplify Aspect Ratio

Enter your video's original width and height to find its simplified aspect ratio (e.g., 16:9, 4:3).

2. Calculate Missing Dimension

Enter your video's base dimensions and one target dimension to calculate the other, maintaining the aspect ratio.

Calculate Target Height

Calculate Target Width

// Function to find the Greatest Common Divisor (GCD) function gcd(a, b) { return (b == 0) ? a : gcd(b, a % b); } // Function to simplify the aspect ratio function calculateRatio() { var originalWidth = parseFloat(document.getElementById('originalWidthRatio').value); var originalHeight = parseFloat(document.getElementById('originalHeightRatio').value); var resultDiv = document.getElementById('simplifiedRatioResult'); if (isNaN(originalWidth) || isNaN(originalHeight) || originalWidth <= 0 || originalHeight <= 0) { resultDiv.innerHTML = 'Please enter valid positive numbers for original width and height.'; return; } var commonDivisor = gcd(originalWidth, originalHeight); var simplifiedWidth = originalWidth / commonDivisor; var simplifiedHeight = originalHeight / commonDivisor; resultDiv.innerHTML = 'Simplified Aspect Ratio: ' + simplifiedWidth + ':' + simplifiedHeight + ''; } // Function to calculate target height based on base dimensions and target width function calculateTargetHeight() { var baseWidth = parseFloat(document.getElementById('baseWidth').value); var baseHeight = parseFloat(document.getElementById('baseHeight').value); var targetWidth = parseFloat(document.getElementById('targetWidthInput').value); var resultDiv = document.getElementById('missingDimensionResult'); if (isNaN(baseWidth) || isNaN(baseHeight) || isNaN(targetWidth) || baseWidth <= 0 || baseHeight <= 0 || targetWidth <= 0) { resultDiv.innerHTML = 'Please enter valid positive numbers for base width, base height, and target width.'; return; } var targetHeight = (targetWidth / baseWidth) * baseHeight; resultDiv.innerHTML = 'If target width is ' + targetWidth + 'px, target height should be: ' + targetHeight.toFixed(0) + 'px'; } // Function to calculate target width based on base dimensions and target height function calculateTargetWidth() { var baseWidth = parseFloat(document.getElementById('baseWidth').value); var baseHeight = parseFloat(document.getElementById('baseHeight').value); var targetHeight = parseFloat(document.getElementById('targetHeightInput').value); var resultDiv = document.getElementById('missingDimensionResult'); if (isNaN(baseWidth) || isNaN(baseHeight) || isNaN(targetHeight) || baseWidth <= 0 || baseHeight <= 0 || targetHeight <= 0) { resultDiv.innerHTML = 'Please enter valid positive numbers for base width, base height, and target height.'; return; } var targetWidth = (targetHeight / baseHeight) * baseWidth; resultDiv.innerHTML = 'If target height is ' + targetHeight + 'px, target width should be: ' + targetWidth.toFixed(0) + 'px'; } .video-ratio-calculator-container { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f9f9f9; padding: 25px; border-radius: 10px; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); max-width: 700px; margin: 30px auto; border: 1px solid #e0e0e0; } .video-ratio-calculator-container h2 { color: #333; text-align: center; margin-bottom: 20px; font-size: 28px; } .video-ratio-calculator-container h3 { color: #0056b3; margin-top: 25px; margin-bottom: 15px; font-size: 22px; border-bottom: 2px solid #007bff; padding-bottom: 5px; } .video-ratio-calculator-container h4 { color: #0056b3; margin-top: 20px; margin-bottom: 10px; font-size: 18px; } .video-ratio-calculator-container p { color: #555; line-height: 1.6; margin-bottom: 15px; } .calculator-section { background-color: #ffffff; padding: 20px; border-radius: 8px; border: 1px solid #ddd; margin-bottom: 20px; } .calculator-input-group { margin-bottom: 15px; display: flex; flex-direction: column; } .calculator-input-group label { margin-bottom: 8px; color: #333; font-weight: bold; font-size: 15px; } .calculator-input-group input[type="number"] { padding: 10px 12px; border: 1px solid #ccc; border-radius: 5px; font-size: 16px; width: 100%; box-sizing: border-box; transition: border-color 0.3s ease; } .calculator-input-group input[type="number"]:focus { border-color: #007bff; outline: none; box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25); } .calculate-button { background-color: #007bff; color: white; padding: 12px 20px; border: none; border-radius: 5px; cursor: pointer; font-size: 17px; font-weight: bold; transition: background-color 0.3s ease, transform 0.2s ease; width: auto; display: inline-block; margin-top: 10px; margin-right: 10px; } .calculate-button:hover { background-color: #0056b3; transform: translateY(-1px); } .calculate-button:active { transform: translateY(0); } .calculator-result { margin-top: 20px; padding: 15px; background-color: #e9f7ef; border: 1px solid #d4edda; border-radius: 8px; color: #155724; font-size: 18px; font-weight: bold; text-align: center; } .calculator-result p { margin: 0; color: #155724; } .calculator-result p strong { color: #0056b3; } .calculator-result p[style*="color:red"] { color: #dc3545 !important; background-color: #f8d7da; border-color: #f5c6cb; padding: 10px; border-radius: 5px; }

Understanding Video Aspect Ratios

The aspect ratio of a video describes the proportional relationship between its width and its height. It's typically expressed as two numbers separated by a colon, like 16:9 or 4:3. This ratio is crucial for how your video appears on different screens and platforms, ensuring it's displayed correctly without distortion or unwanted cropping.

Why Aspect Ratio Matters

• Visual Quality: Maintaining the correct aspect ratio prevents your video from looking stretched, squashed, or having black bars (letterboxing or pillarboxing) that aren't intended.
• Compatibility: Different devices (smartphones, TVs, monitors) and platforms (YouTube, Instagram, TikTok) have preferred or required aspect ratios. Knowing and adjusting your video's ratio ensures it fits seamlessly.
• Cropping and Framing: When you need to adapt a video from one ratio to another, understanding the math helps you make informed decisions about what parts of the frame will be visible.

Common Video Aspect Ratios

Here are some of the most prevalent aspect ratios you'll encounter:

• 16:9 (Widescreen): This is the most common aspect ratio for modern televisions, computer monitors, and online video platforms like YouTube and Netflix. It's considered the standard for high-definition (HD), Full HD (1080p), and Ultra HD (4K) content. Examples: 1920×1080, 1280×720.
• 4:3 (Standard Definition): Once the standard for older televisions and computer monitors, 4:3 is now less common but still used for some archival footage or specific artistic choices. Examples: 640×480, 1024×768.
• 21:9 (Ultrawide/Cinematic): Often referred to as "Cinemascope" or "Anamorphic," this wider ratio is used for a more immersive, cinematic feel, especially in movies. Examples: 2560×1080, 3440×1440.
• 9:16 (Vertical Video): Popularized by social media platforms like TikTok, Instagram Stories, and YouTube Shorts, this ratio is optimized for vertical viewing on smartphones. Examples: 1080×1920, 720×1280.
• 1:1 (Square Video): Commonly used on social media platforms like Instagram for posts, square videos offer a versatile format that works well on both mobile and desktop. Examples: 1080×1080, 600×600.

How to Use the Video Ratio Calculator

Our calculator provides two main functions to help you manage your video dimensions:

1. Simplify Aspect Ratio

If you have a video with dimensions like 1920×1080 or 1280×720, this section will simplify those numbers to their most basic ratio (e.g., 16:9). Simply enter the Original Width and Original Height of your video, then click "Simplify Ratio."

Example: You have a video that is 1920 pixels wide and 1080 pixels high.

• Enter 1920 in "Original Width (pixels)".
• Enter 1080 in "Original Height (pixels)".
• Click "Simplify Ratio".
• Result: 16:9

2. Calculate Missing Dimension

This section is useful when you need to resize a video to a new width or height while preserving its original aspect ratio. This prevents your video from looking distorted.

First, enter the Base Width and Base Height of your original video. These are the dimensions you want to maintain the ratio from.

Then, choose whether you want to calculate a target height or a target width:

• To Calculate Target Height: Enter your desired Target Width. The calculator will then tell you what the corresponding height should be.
• To Calculate Target Width: Enter your desired Target Height. The calculator will then tell you what the corresponding width should be.

Example 1: Calculating Target Height

You have a 16:9 video (e.g., 1920×1080) and you want to resize it to a width of 1280 pixels for a specific platform.

• Enter 1920 in "Base Width (pixels)".
• Enter 1080 in "Base Height (pixels)".
• Enter 1280 in "Target Width (pixels)".
• Click "Calculate Target Height".
• Result: If target width is 1280px, target height should be: 720px (making it 1280×720).

Example 2: Calculating Target Width

You have a 4:3 video (e.g., 640×480) and you need to fit it into a vertical space of 768 pixels, maintaining its original ratio.

• Enter 640 in "Base Width (pixels)".
• Enter 480 in "Base Height (pixels)".
• Enter 768 in "Target Height (pixels)".
• Click "Calculate Target Width".
• Result: If target height is 768px, target width should be: 1024px (making it 1024×768).

Using this calculator will help you ensure your videos always look their best, no matter where they are viewed.