Pixel & Aspect Ratio Converter

Convert image dimensions into megapixels, the reduced aspect ratio (16:9, 4:3), the nearest common ratio, print sizes at 300 DPI, and uncompressed file sizes for B&W, grayscale, RGB, and RGBA images.
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Image Dimensions
Pixel & Aspect Ratio
Resolution1,920 × 1,080 px
Megapixels2.07 MP
Aspect ratio16:9 (1.78)
Common ratio16:9 (Widescreen TV)
Print @ 300 DPI6.4 × 3.6 in (16.3 × 9.1 cm)
Uncompressed file size
B&W (1 bit)265.42 KB
Grayscale (8 bit)2.07 MB
RGB (24 bit)6.22 MB
RGBA (32 bit)8.29 MB
A 1920 × 1080 frame is 2.07 MP at 16:9. Real file sizes are much smaller after JPEG/H.264 compression.
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Overview

The Pixel & Aspect Ratio Converter takes image dimensions and returns the resolution, megapixel count, the reduced aspect ratio, the nearest standard ratio (16:9, 4:3, and so on), the print size at 300 DPI, and the uncompressed file size for common bit depths.

Common Use Cases

How to Use

1
Type the width and height in pixels.
2
All results update instantly: megapixels, aspect ratio, common ratio, print size, and uncompressed sizes.
3
The aspect ratio is reduced by the greatest common divisor and then matched against common standards.
4
Use the Print button to export the result table.

Example Scenario

A 1920 × 1080 camera frame

Enter 1920 and 1080. The calculator reports 2.07 MP, a 16:9 aspect ratio, a 6.4 × 3.6 inch print at 300 DPI (16.26 × 9.14 cm), and an uncompressed RGB size of 6.22 MB.

Technical Notes

Megapixels are width × height ÷ 1,000,000. Common values: 1080p is 2.07 MP, 4K UHD is 8.29 MP, 8K is 33.18 MP.

The reduced ratio divides width and height by their greatest common divisor. The common-ratio match uses a small tolerance so near-standard ratios are detected.

Print size is pixels divided by DPI, then converted to centimeters. 300 DPI is the standard for sharp photo prints.

Uncompressed size is width × height × bits per pixel ÷ 8. Real formats like JPEG and H.264 are far smaller.

Common Mistakes

Frequently Asked Questions

2.07 megapixels at 16:9 aspect ratio. Uncompressed that is about 6.2 MB for a 24-bit RGB frame before compression.

At 300 DPI, an 8×10 inch print needs 2400 × 3000 pixels, or about 7.2 megapixels.

Divide width by height and reduce the pair by their greatest common divisor. The calculator does this for you and names the standard ratio if it matches.

DPI is dots per inch and describes printing; PPI is pixels per inch and describes screens. For print math, 300 DPI is the common standard.

Related Topics

Aspect ratioMegapixelResolutionDPIImage file sizeCCTV resolution