Image Megapixel Calculator – Free Online Tool
Calculate megapixels, total pixels, aspect ratio, orientation, and uncompressed image memory from dimensions or a local image.
Megapixel Calculator From Image Width and Height
Enter the pixel width and height to calculate the exact total pixel count and megapixels. One megapixel equals one million pixels, so a 4000 × 3000 image contains 12,000,000 pixels, or 12 megapixels.
Check an Image's Megapixels Privately
Choose a JPG, PNG, WebP, GIF, or BMP to read its natural pixel dimensions and calculate megapixels locally. The file, filename, preview, and image content are not sent to ToolsMint.
Compare Full HD, 4K, 8K, and Camera Resolutions
Use the built-in presets to compare common display and camera sizes. Full HD is about 2.07 MP, 4K UHD is about 8.29 MP, and 8K UHD is about 33.18 MP. Camera labels are often rounded, so exact values vary by sensor and crop.
Aspect Ratio and Image Memory Estimates
The calculator simplifies width and height to an aspect ratio and estimates the raw memory needed for 24-bit RGB and 32-bit RGBA pixels. These are uncompressed estimates; JPG, PNG, WebP, and other file sizes depend on compression and image content.
Megapixels Are Only One Part of Image Quality
A larger pixel count can support bigger displays, cropping, or printing, but it does not guarantee a sharper photo. Lens quality, focus, sensor size, noise, compression, viewing distance, and print density also affect the final result.
Frequently Asked Questions
Everything you need to know about the Image Megapixel Calculator.
How do I calculate megapixels?
Multiply image width by height in pixels, then divide by 1,000,000. A 6000 × 4000 image is 24 megapixels.
How many megapixels is 4K?
4K UHD at 3840 × 2160 contains 8,294,400 pixels, which is about 8.29 megapixels.
How many megapixels is 8K?
8K UHD at 7680 × 4320 contains 33,177,600 pixels, which is about 33.18 megapixels.
Does a higher megapixel count always mean better quality?
No. Megapixels measure pixel count. Lens quality, focus, sensor performance, noise, compression, and output size also matter.
Is my uploaded image sent to a server?
No. The browser reads its dimensions locally and the image never leaves your device.