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Image Resolution & Aspect Ratio Calculator

Results

Aspect Ratio:

Total Resolution: Megapixels

Recommended Print Size: inches

function calculatePictureStats() { var w = parseFloat(document.getElementById('imgWidth').value); var h = parseFloat(document.getElementById('imgHeight').value); var dpi = parseFloat(document.getElementById('imgDPI').value); var resultsDiv = document.getElementById('imageResults'); if (isNaN(w) || isNaN(h) || w <= 0 || h <= 0) { alert("Please enter valid width and height in pixels."); return; } if (isNaN(dpi) || dpi <= 0) { dpi = 300; } // Calculate GCD for aspect ratio var gcd = function(a, b) { return b ? gcd(b, a % b) : a; }; var common = gcd(w, h); var ratioW = w / common; var ratioH = h / common; // Calculate Megapixels var megapixels = (w * h) / 1000000; // Calculate Print Size var printW = (w / dpi).toFixed(2); var printH = (h / dpi).toFixed(2); // Display Results document.getElementById('resRatio').innerText = ratioW + ":" + ratioH; document.getElementById('resMega').innerText = megapixels.toFixed(2); document.getElementById('resPrint').innerText = printW + " x " + printH; // Advice logic var advice = ""; if (megapixels = 12) { advice = "High Resolution: Excellent for large format prints and detailed professional photography."; } else { advice = "Standard Resolution: Good for most web uses and medium-sized prints."; } document.getElementById('resAdvice').innerText = advice; resultsDiv.style.display = 'block'; }

Understanding Picture Dimensions and Resolution

When working with digital photography or graphic design, understanding the relationship between pixels, aspect ratios, and resolution is critical. This calculator helps you translate digital pixel counts into physical print sizes and standard display formats.

What is Aspect Ratio?

Aspect ratio is the proportional relationship between the width and height of a picture. It is written as two numbers separated by a colon, such as 4:3 or 16:9. For example, a standard HD video has a 16:9 aspect ratio, meaning for every 16 pixels in width, there are 9 pixels in height. Common ratios include:

  • 1:1 – Square (popular on Instagram)
  • 4:3 – Standard digital camera sensor / Older television sets
  • 3:2 – Traditional 35mm film and DSLR cameras
  • 16:9 – Widescreen monitors and modern smartphones

The Importance of Megapixels (MP)

A megapixel consists of one million pixels. It is a measure of the "size" of the digital image data. While more megapixels do not always mean a "better" photo (sensor quality matters more), they do determine how large you can print a picture before it looks blurry or "pixelated."

Calculating Print Size from Pixels

To determine how large a digital picture can be printed, you must consider PPI (Pixels Per Inch). For professional gallery-quality prints, 300 PPI is the industry standard. For general home printing or viewing from a distance, 150 to 200 PPI may be sufficient.

The formula used by our calculator is:

Print Dimension (Inches) = Pixels / PPI

Realistic Examples

Pixel Dimensions Total MP Print Size (300 DPI)
1920 x 1080 (HD) 2.07 MP 6.4″ x 3.6″
4032 x 3024 (iPhone 12) 12.19 MP 13.4″ x 10.1″
6000 x 4000 (DSLR) 24.00 MP 20.0″ x 13.3″

How to Use This Tool

Simply enter the width and height of your image in pixels. You can find this by right-clicking an image file and selecting "Properties" (Windows) or "Get Info" (Mac). If you are preparing an image for professional printing, keep the PPI at 300. If you are just curious about the aspect ratio for social media or web design, the PPI value will not affect the ratio or megapixel results.

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