Image File Size Calculator
Estimate the uncompressed size of an image from its pixel dimensions and colour depth. Enter width, height and bits per pixel to see uncompressed…
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Estimate the uncompressed size of an image from its pixel dimensions and colour depth. Enter width, height and bits per pixel to see uncompressed size and megapixels when you calculate.
Worked example
Example calculated from the starting values. Enter your own values and press Calculate to get your result.
With the default inputs (width = 4,000 px, height = 3,000 px, bits per pixel = 24), the results are: uncompressed size 36.00 MB; megapixels 12.0 MP.
Quick reference: width vs result
Reference table based on the example values; it is not your calculation result.
| Width (px) | Uncompressed size | Megapixels |
|---|---|---|
| 2,000 | 18.00 MB | 6.0 MP |
| 4,000 | 36.00 MB | 12.0 MP |
| 8,000 | 72.00 MB | 24.0 MP |
| 20,000 | 180.00 MB | 60.0 MP |
| 40,000 | 360.00 MB | 120.0 MP |
| 80,000 | 720.00 MB | 240.0 MP |
Frequently asked questions
What formula does this calculator use?
Uncompressed size = w × h × bpp ÷ 8 ÷ 1000000; Megapixels = w × h ÷ 1000000. Variables: w = width in px, h = height in px, bpp = bits per pixel.
What do I need to enter?
You need width (px), height (px), bits per pixel. Results update as you type.
What is an example result?
With the default inputs (width = 4,000 px, height = 3,000 px, bits per pixel = 24), the results are: uncompressed size 36.00 MB; megapixels 12.0 MP.
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