Uncompressed-size calculator

How large will these scans really be?

Resolution changes pixel dimensions fast. This calculator shows the uncompressed working size before a file format, compression setting, or image content changes the saved result.

Your result

Resolution has a storage bill

Count items, pixel dimensions, color depth, working copies, and backups before buying capacity.

Storage is more than the first folder

Plan space for working files, checked masters, convenient copies, and backups. The National Archives recommends three copies on two media with one copy off-site for family files.

The size calculation uses only your dimensions, PPI, bit depth, channels, and item count. The backup rule comes from the National Archives family-digitizing guide, which recommends three copies on two media with one copy off-site.