How is inventory quantity determined in Shopify for product listings?

Shopify determines inventory quantity based on the specific field you choose to sync in Stock Sync. The two common options are Available Quantity and On Hand Quantity.

Available Quantity reflects what is actually sellable in Shopify. It subtracts committed or reserved stock and excludes unavailable quantities. This is why users often see it match what they expect for sellable inventory.

On Hand Quantity represents the total physical stock in a location, including unavailable, committed, and reserved units.

Stock Sync will update whichever field you map in your feed. If the setting is configured to Available Quantity, the app will push the sellable quantity for each location. If mapped to On Hand Quantity, it pushes the total physical stock instead.

Refer here for more details: 📘 How does On Hand Quantity and Available Quantity work?

Updated on: 11/06/2026