Why is my JPEG much smaller?

This tool estimates uncompressed size. Compression depends on content and quality settings.

What bit depth should I use?

24 for typical RGB photos (8 bits per channel). Use 48 for 16-bit/channel RAW-style math.

Set overhead above 1 if you want a rough pad for sidecars or dual-format exports.

Storage cares about pixels and bit depth. Print size cares about pixels and DPI. Use Print Size for inches on paper.

Photography

Image Storage Calculator

Estimate storage for photos from resolution, bit depth, and count.

Width (px)

Height (px)

Bits per pixel

Number of images

Format overhead ×

Results update as you type.

Last updated 3 October 2026

Enter pixel width and height, bit depth, how many images, and an optional overhead factor. Read size per image and total storage.

bits per image = width × height × bitDepth
bytes = bits ÷ 8
with overhead = bytes × overhead
total = per-image size × count

6000×4000 at 24-bit, 100 images, overhead 1 → about 72 MB each before compression.

Why is my JPEG much smaller?: This tool estimates uncompressed size. Compression depends on content and quality settings.
What bit depth should I use?: 24 for typical RGB photos (8 bits per channel). Use 48 for 16-bit/channel RAW-style math.
Does overhead include previews?: Set overhead above 1 if you want a rough pad for sidecars or dual-format exports.
How does this relate to print size?: Storage cares about pixels and bit depth. Print size cares about pixels and DPI. Use Print Size for inches on paper.