Image Size Calculator
Estimate an image's file size from its dimensions.
Calculated locally in your browser.
Overview
Estimates an uncompressed image's raw file size from its pixel dimensions and color depth — useful for capacity planning before compression.
How to use it
- 1Enter width, height and bit depth.
- 2The estimated raw size appears instantly.
Formula
Raw size
bytes = width × height × (bitDepth / 8)
Tips
- Real-world compressed formats (JPG, PNG, WebP) are almost always dramatically smaller than this raw estimate — use the Compress Image tool to see actual compressed size.