Megapixels
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
(W×H)/10⁶
About this calculator
The megapixels (MP) calculator is used to determine the total resolution of a digital image based on its width and height in pixels. The formula applied is MP = (Width × Height) / 1,000,000, where width and height must be in pixels. This tool is useful for photographers, graphic designers, and users comparing the resolution capabilities of cameras, smartphones, or digital images.
To use the calculator, simply enter the image dimensions in pixels. For example, an image of 4000 pixels width and 3000 pixels height will have 12 MP. This helps understand image detail quality and choose equipment with adequate resolution for your needs. However, remember that image quality depends on factors beyond megapixels, such as sensor size and optical quality.
This calculator is also relevant for photographic prints. A higher MP count allows enlarging images without losing sharpness, provided the printer resolution is compatible. Conversely, images with few megapixels may appear blurry when enlarged. Use it to plan scaling for graphic or photographic projects.
If you don't know the exact image dimensions, check the device or software specifications that generated it. Avoid approximate values, as precise calculations are essential for accurate comparisons. The formula assumes common 4:3 or 3:2 aspect ratios found in digital cameras. For other ratios, adjust the measurements before calculating.
Frequently asked questions
Why calculate megapixels?
Megapixels indicate the total resolution of an image. They help compare the detail capability of cameras, smartphones, and digital images, as well as plan photographic prints.
How to use the calculator?
Enter the image dimensions in pixels (width and height). The formula MP = (Width × Height) / 1,000,000 will be applied automatically.
Are higher megapixels always better?
No. Image quality depends on sensor size, optics, and output device resolution. Excessive megapixels may not compensate for smaller sensors or lower-quality lenses.
How does this affect print quality?
Images with more megapixels allow larger prints without losing sharpness. However, printer quality and pixel density (DPI) are also essential for crisp results.