Digital Storage Needs Calculator

Estimate how much storage you need for photos, videos, documents, apps, games, backups, and future growth. It is useful when choosing a phone, laptop, external drive, memory card, NAS, or cloud plan.

How to use this calculator

Enter current storage used by photos, videos, documents, apps and games, and other files. Add the number of backup copies you want, then enter an annual growth rate. The result shows current data, backup storage, immediate need, three-year planning need, and a recommended storage tier.

For unit conversions, use the digital storage converter. If you are comparing internet transfer times for large backups, the data transfer rate calculator can help.

How it works

The calculator adds your current categories, multiplies that data by the number of backup copies, then grows the total for three years.

$current\ data = photos + videos + documents + apps + other$

$three\ year\ need = immediate\ need × (1 + annual\ growth\ rate \div 100)^3$

It then rounds up to the next common tier.

Example

Suppose you have 120 GB of photos, 250 GB of videos, 20 GB of documents, 80 GB of apps, and 30 GB of other files. Current data is 500 GB. With one backup copy, immediate need is 1,000 GB. At 20 percent annual growth, the three-year need is about 1,728 GB, so the recommended tier is 2 TB.

Planning tips

Video and game libraries grow quickly, while documents usually grow slowly. Leave headroom for operating system updates, exports, app caches, duplicate edits, and backup history. If replacing the device later is difficult, choose the larger tier.