Image File Size Calculator
Estimate the uncompressed memory and raw bitmap size of an image using its pixel dimensions and color depth.
Calculate Image Size
Enter your image dimensions and select the color depth to calculate the raw uncompressed size.
Uncompressed Raw Size
Estimated memory required to store every pixel without compression.
Width × Height × Color Depth ÷ 8 = Bytes
How Image File Size Is Calculated
An uncompressed image stores information for every individual pixel. The total amount of memory required depends on the image width, height, and number of bits used to represent each pixel.
8-bit
Typically represents grayscale images using 256 possible shades.
24-bit
Uses 8 bits each for red, green, and blue channels for standard RGB color.
32-bit
Usually includes RGB color plus an additional 8-bit alpha transparency channel.
Uncompressed vs Compressed Image Files
This calculator estimates the raw memory required when an image is uncompressed. Actual files such as JPEG, PNG, and WebP can be considerably smaller because they use compression.
For example, a 3840 × 2160 image at 24-bit color requires approximately 23.73 MiB of raw pixel memory, regardless of whether the original JPEG or WebP file is much smaller.