Estimate the storage a photo library consumes from the number of images and their average file size.
Item count times average size gives the raw payload; the overhead percentage covers the indexes, framing and metadata that always accompany the data itself. Results are shown in binary MB and GB (1,024-based), which is what tooling reports. Storage and transfer quotas are hard limits, and a photo library that is 15% larger than estimated is what turns a nightly job into a failed one.
Photo Storage
Total bytes = Number of photos × Average photo size × (1 + overhead)
Total bytes = Number of photos × Average photo size × (1 + overhead) Item count times average size gives the raw payload; the overhead percentage covers the indexes, framing and metadata that always accompany the data itself. Results are shown in binary MB and GB (1,024-based), which is what tooling reports.
Storage and transfer quotas are hard limits, and a photo library that is 15% larger than estimated is what turns a nightly job into a failed one.
This calculator takes 3 inputs: Number of photos, Average photo size, Structural or index overhead. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.