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Image File Size Calculator
Estimate the uncompressed file size of an image from its pixel dimensions and color bit depth.
Uncompressed size
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Uncompressed size
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About the Image File Size Calculator
An uncompressed raster image stores a fixed number of bits for every pixel. Multiplying the total pixel count by the bits used per pixel gives the raw file size before any compression is applied.
Formula: File Size (bytes) = Width × Height × (Bit Depth ÷ 8)
Formats like JPEG apply compression that shrinks the actual file well below this uncompressed estimate, while formats like BMP or RAW store data closer to this raw size. This calculator is most useful for estimating memory or storage needs for uncompressed image buffers.
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