When to use this calculator
This raw-pixel estimate differs from JPEG or PNG file size because compressed images depend on their content and encoding.
Explore the image, audio & video calculators for other questions in this topic. For a related calculation, use the Image Scaling Percentage Calculator: Find the resize multiplier expressed as a percentage of original width.
PUTTING IT INTO PRACTICE
Image File Size: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Width (pixels, integer) | 1,920 |
| Height (pixels, integer) | 1,080 |
| Bits per pixel (integer) | 24 |
| Result | 6.2208 MB |
- Check the input labels and enter the example values above.
- Apply the relationship: Size in decimal MB = width × height × bits per pixel/(8 × 1,000,000).
- The result is 6.2208 MB, rounded for display.
How to interpret your result
Excludes compression, row padding, file headers, metadata and colour tables.
Uncompressed pixel and PCM estimates use a predictable data layout. Compressed media sizes depend on codec and content. Average encoded bitrate can estimate file size but does not by itself establish quality.
Frequently asked questions
Will an uncompressed image estimate match a JPEG file?
Usually not. JPEG uses compression, so its final size depends on the image and encoding settings.
When is the image file size calculator useful?
This raw-pixel estimate differs from JPEG or PNG file size because compressed images depend on their content and encoding.
How do I use the image file size calculator?
Enter width (pixels, integer), height (pixels, integer), bits per pixel (integer). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Size in decimal MB = width × height × bits per pixel/(8 × 1,000,000).
What should I check before using the result?
Excludes compression, row padding, file headers, metadata and colour tables.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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