Controlling inventory for an ecommerce store means making sure the number your customer sees on the website matches what's actually on the shelf, at every moment. If your store shows 120 units and there are really only 94 left, you're going to sell 26 you can't deliver: 26 cancellations, 26 emails to support, and probably a bad review or two.
The solution isn't counting more often, it's stopping stock from drifting in the first place. That comes down to five connected things: a catalogue with unique SKUs, validated receiving, every movement logged with a scanner, separate stock statuses (available, reserved, blocked) and cycle counts that look for the root cause of every discrepancy. Let's go through them one by one.
Theoretical stock versus real stock
Theoretical stock is what should be there according to your records. Real stock is what's physically located, in good condition and ready to go out on an order. The whole point of stock management is closing the gap between the two.
That gap almost never appears overnight during the annual stocktake. It builds up every day through uncontrolled movements: a delivery signed off by box count rather than by unit, a return put back on the shelf without being checked, a location change nobody logs, or an order picked in the wrong size. Each one throws off one or two units. After a few months, the mismatch starts showing up in sales.
And it costs money either way. If the system shows stock that doesn't exist, you oversell. If it hides stock that does exist, you stop selling and end up over-ordering from your supplier out of caution, tying up cash and space.
