Storage Capacity Calculators — How Much Fits on a Drive

Capacity questions look simple until you multiply: photos are megabytes, video is gigabytes per hour, and every filesystem keeps a slice for itself. These calculators count in whole files, show the conservative figure at 93% usable, and cover the specialised cases — memory cards for cameras, NVR storage for security systems, loop recording for dashcams, and the reason a “1 TB” drive reports 931 GiB. Use them before buying storage rather than after the card fills in the middle of a shoot.