Compare camera or scan files
See the real pixel area rather than relying on a rounded megapixel label.
Megapixel, ratio and image-data calculator
Calculate megapixels, aspect ratio and image data.
Enter an image’s width and height to calculate its exact megapixel count, simplified aspect ratio and estimated uncompressed RGB size. Printable dimensions are included only as a secondary reference.
Instant resultsNo signupRuns in your browser
Megapixel, ratio and image-data calculator
Enter the image dimensions
Total image area24 megapixels6,000 × 4,000 pixels
- Aspect ratio
- 3:2
- Uncompressed RGB estimate
- 68.7 MB
- Reference size at 300 PPI
- 20 × 13.33 in
- Reference size at 240 PPI
- 25 × 16.67 in
- Reference size at 200 PPI
- 30 × 20 in
- Reference size at 150 PPI
- 40 × 26.67 in
When to use it
Start with the result you need
This calculator is most useful when one part of the print specification is known and another needs to be checked.
Check an exported crop
Confirm its exact megapixel count and proportions after resizing or cropping.
Estimate uncompressed image data
Approximate the RGB memory required before file compression or editing overhead.
The calculation
How it works
Multiply width by height and divide by one million: megapixels = width × height ÷ 1,000,000. A 6000 × 4000 pixel image contains 24 megapixels.
Megapixels describe total area, not print quality by themselves. To find the largest physical output for a specific file and chosen density, use the maximum print size calculator.
Quick reference
Common image resolutions and exact pixel counts
Megapixels are pixel area. Aspect ratio describes shape, while uncompressed RGB size estimates three bytes per pixel.
| Pixel dimensions | Megapixels | Aspect ratio | RGB estimate |
|---|---|---|---|
| 1920 × 1080 | 2.1 MP | 16:9 | 5.9 MB |
| 3840 × 2160 | 8.3 MP | 16:9 | 23.7 MB |
| 4000 × 3000 | 12 MP | 4:3 | 34.3 MB |
| 6000 × 4000 | 24 MP | 3:2 | 68.7 MB |
| 8256 × 5504 | 45.4 MP | 3:2 | 130 MB |
The RGB estimate excludes compression, metadata, layers and application overhead. Actual JPEG, PNG, TIFF and project files vary.
Check the numbers
6000 × 4000 pixels
The image contains exactly 24 megapixels, uses a 3:2 ratio and needs about 68.7 MB as uncompressed 8-bit RGB data.
3840 × 2160 pixels
A 4K frame contains about 8.3 megapixels, uses a 16:9 ratio and needs about 23.7 MB uncompressed.
2400 × 3000 pixels
The file contains 7.2 megapixels, simplifies to a 4:5 ratio and needs about 20.6 MB uncompressed.
Before you export
Common mistakes to avoid
Equating megapixels with sharpness
Pixel count cannot reveal focus, motion blur, noise, compression or lens quality.
Ignoring aspect-ratio crop
A paper shape that differs from the image can remove pixels and reduce the available print dimensions.
Comparing rounded labels
Two files sold as the same megapixel class can have different exact widths, heights and proportions.
Calculate megapixels, aspect ratio and image data. FAQ
How are megapixels calculated?
Multiply pixel width by pixel height and divide by one million. The result is the total number of image pixels in millions.
Is megapixel count the same as file size?
No. Megapixels count image pixels. File size also depends on colour depth, compression, format, metadata and editing layers.
Does more megapixels always mean a better print?
No. More pixels can support a larger print, but source sharpness, processing, crop and the printing method also affect the result.
Reviewed for accuracy: 28 July 2026