Image File Size Calculator
Calculate uncompressed image file sizes based on dimensions and bit depth
Image Properties
Horizontal resolution in pixels
Vertical resolution in pixels
Number of bits per pixel determines color range
Image File Size Results
Image Resolution: 1920 × 1080 pixels
Formula: File Size = Width × Height × Bit Depth ÷ 8
Calculation: 1920 × 1080 × 24 ÷ 8 = 6220800 bytes
Note: This is for uncompressed images. Actual file sizes vary with compression.
File Size Analysis
Example Calculations
Full HD Photo (24-bit)
Resolution: 1920 × 1080 pixels
Bit Depth: 24-bit (16.7 million colors)
Pixel Count: 2,073,600 pixels (2.07 MP)
File Size: ~6.2 MB uncompressed
Use Case: High-quality photography, printing
Web Image (8-bit)
Resolution: 800 × 600 pixels
Bit Depth: 8-bit (256 colors)
Pixel Count: 480,000 pixels (0.48 MP)
File Size: ~468 KB uncompressed
Use Case: Web graphics, thumbnails
Bit Depth Guide
1-bit
Black & White only (2 colors)
8-bit
Grayscale or 256 colors
24-bit
True Color (16.7M colors)
32-bit
True Color + transparency
Common Resolutions
Image Tips
Higher bit depth = better color quality
More pixels = larger file size
Compression can reduce file size by 70-90%
JPEG uses lossy compression
PNG uses lossless compression
Understanding Image File Sizes
What Affects File Size?
Image file size depends on two main factors: the number of pixels (resolution) and the bit depth (color information per pixel). More pixels and higher bit depth result in larger file sizes but better image quality.
Raster vs Vector Images
- •Raster: Made of pixels, size calculated by this tool
- •Vector: Made of mathematical equations, scalable
- •JPEG, PNG, GIF, BMP are raster formats
- •SVG, AI, EPS are vector formats
File Size Calculation
File Size = Width × Height × Bit Depth ÷ 8
(Result in bytes for uncompressed image)
Compression Impact
- •JPEG: 70-90% compression (lossy)
- •PNG: 20-50% compression (lossless)
- •GIF: Limited to 256 colors
- •BMP: Usually uncompressed
Practical Applications
Web Images
Optimize for fast loading, use JPEG/PNG
Print Images
High resolution, 300 DPI recommended
Mobile Apps
Multiple sizes for different screen densities