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Megapixel Calculator - Online Print Size & Resolution

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Megapixel Calculator

Calculate print size, resolution & megapixels instantly

Free Online Tool
Image Details
Aspect Ratio: (3:2)
Quick Presets:
0.5 MP120 MP
Quick DPI:
Results
24.00
MEGAPIXELS
Total: 24,000,000 pixels
Print Size at 300 DPI
inches
centimeters
Excellent for high-quality printing
Print size at other DPI values:
150 DPI: 40.0×26.7" 200 DPI: 30.0×20.0" 600 DPI: 10.0×6.7"
Reverse Calculator — Print Size to Pixels

Enter your desired print dimensions to find out how many megapixels you need.

Needed: 7.2 MP
(2400×3000 px)
Common sizes:
Print Size Reference Guide (at 300 DPI)
Megapixels Resolution Aspect Ratio Print Size (inches) Print Size (cm) Best For
2 MP1920×108016:96.4×3.6"16.3×9.1 cmSmall prints, web
8 MP3840×216016:912.8×7.2"32.5×18.3 cmMedium prints
12 MP4000×30004:313.3×10.0"33.9×25.4 cm8×10" prints
20 MP5472×36483:218.2×12.2"46.3×30.9 cm11×14" prints
24 MP6000×40003:220.0×13.3"50.8×33.9 cm16×20" prints
33 MP7680×432016:925.6×14.4"65.0×36.6 cmLarge posters
48 MP8000×60004:326.7×20.0"67.7×50.8 cmGallery prints
61 MP9504×63363:231.7×21.1"80.5×53.6 cmProfessional large format
Frequently Asked Questions

A megapixel (MP) equals one million pixels. It measures the total resolution of a digital image or camera sensor. For example, a 24-megapixel camera captures images with approximately 24 million individual pixels. The megapixel count is calculated by multiplying the image width in pixels by its height in pixels, then dividing by one million. Higher megapixel counts allow for larger prints and more cropping flexibility.

Simply multiply the width by the height (both in pixels), then divide by 1,000,000. Formula: Megapixels = (Width × Height) ÷ 1,000,000. For example, an image measuring 6000×4000 pixels equals 24,000,000 total pixels, which is 24 megapixels. Use our calculator above to instantly convert between pixel dimensions and megapixels.

For a high-quality 8×10 inch print at 300 DPI, you need approximately 7.2 megapixels (2400×3000 pixels). At 200 DPI (still acceptable quality), you need about 3.2 megapixels (1600×2000 pixels). Most modern smartphones and cameras easily exceed this requirement. A 12MP camera can produce excellent 8×10 prints with room for cropping.

300 DPI (dots per inch) is the industry standard for high-quality photo printing. At this resolution, the human eye cannot distinguish individual dots at normal viewing distances. For large-format prints viewed from farther away (posters, banners), 150-200 DPI is often sufficient. For professional fine art prints, some photographers use 600 DPI, though the visible difference is subtle. Screen displays use 72-96 PPI (pixels per inch).

A 12MP photo (typically 4000×3000 pixels) printed at 16×20 inches yields approximately 200 DPI (4000÷20=200). This is acceptable for wall art viewed from a distance of 2-3 feet. For close-up viewing, 300 DPI would be ideal, which at 16×20" requires about 28.8 megapixels. The quality is subjective—many photographers find 200 DPI perfectly adequate for large prints.

PPI (Pixels Per Inch) refers to the pixel density of a digital display or image file. DPI (Dots Per Inch) refers to the printed dot density on paper. While technically different, the terms are often used interchangeably in photography. For printing purposes, PPI of the digital file translates directly to the DPI the printer uses. When preparing images for print, set the file's PPI to match your desired print DPI (usually 300).

4K UHD resolution (3840×2160 pixels) equals approximately 8.3 megapixels. This is why 4K video is roughly equivalent to an 8MP still image in terms of pixel count. 8K resolution (7680×4320) equals about 33.2 megapixels. For comparison, a 24MP full-frame camera captures nearly three times the detail of a 4K video frame.

For most professional photography, 20-30 megapixels is the sweet spot. This range provides excellent detail for prints up to 16×20 inches at 300 DPI, with room for cropping. Wedding and portrait photographers often use 24MP cameras. Commercial and fine art photographers may prefer 45-61MP for large-format printing. Sports and wildlife photographers sometimes prioritize speed over resolution, using 20-24MP bodies for faster burst rates.

As print size increases, the effective DPI decreases (since the same number of pixels is spread over a larger area). A 24MP image printed at 8×10" has an extremely high 500+ DPI, while the same image at 24×36" drops to about 139 DPI. Viewing distance matters: larger prints are typically viewed from farther away, so lower DPI is acceptable. A billboard may use just 10-20 DPI but looks perfectly sharp from the highway.

A 24MP camera (6000×4000 pixels) can produce:
• At 300 DPI: up to 20×13.3 inches (excellent quality)
• At 200 DPI: up to 30×20 inches (very good quality)
• At 150 DPI: up to 40×26.7 inches (good for posters)
The "maximum" size depends on your quality standards and viewing distance. Many photographers comfortably print 24MP images at 20×30 inches with excellent results, especially when viewed at normal wall distances.
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