Image File Size Calculator

Digital image size begins with pixel count. Multiplying width by height gives the total number of pixels, and multiplying that count by color depth gives the number of stored bits before compression. Dividing by eight converts bits to bytes. A 1920 by 1080 image contains 2,073,600 pixels; at 24 bits per pixel, its raw pixel data occupies 6,220,800 bytes, or about 5.93 MiB. File headers, metadata, color profiles, thumbnails, and format-specific structures can add extra data. Color depth describes how many bits represent each pixel. Standard RGB imagery commonly uses 24 bits, with eight bits each for red, green, and blue. Adding an eight-bit alpha channel creates 32-bit RGBA data. Grayscale may use 8 or 16 bits per pixel, while professional editing and scientific workflows can use higher channel precision. This calculator accepts any positive bit depth so it can model those different workflows. Actual JPEG, WebP, AVIF, HEIC, PNG, and TIFF sizes depend on compression. Photographs with texture and noise are harder to compress than simple graphics with flat colors. Lossy quality settings discard information and can reduce files dramatically, while lossless formats preserve exact pixels but may remain much larger. The stored-size percentage lets you model this uncertainty. Use 100 percent for uncompressed data, 10 percent for a rough ten-to-one result, or a percentage measured from comparable images exported with the same software settings. The estimate is useful for memory cards, upload limits, web performance budgets, scanning projects, and archive capacity. Multiply the result by the number of images when planning a collection, and leave overhead for previews, catalogs, backups, and filesystem allocation. For a production delivery, export a representative image and inspect its real byte count; that sample offers a better compression estimate than any generic assumption. Cloud services may calculate quotas with decimal units while operating systems display binary units. Check the provider's convention before comparing a storage plan directly with the MiB estimate shown here.