Periodic vs Perpetual Inventory: Which Suits Your Business?

Inventory management revolves around one question: how much of each item do I actually have right now? The two traditional answers are periodic and perpetual inventory.

Periodic inventory

Quantities are physically counted at set intervals — monthly or yearly — and cost of goods sold is derived from the difference between counts. Simple and cheap, but with a fatal flaw: between counts you don't know your true stock, and you discover shortages, waste and errors far too late.

Perpetual inventory

Every inbound and outbound movement is recorded as it happens, keeping each item's balance continuously up to date. Historically this was the preserve of large companies due to system costs — but cloud systems have completely changed that equation.

Why there's no real debate anymore

When the cashier, purchasing and inventory are one system, perpetual inventory happens automatically at no extra effort: every sale deducts from the balance and every receipt adds to it — exactly how Mawrid inventory works. Physical counts still play a periodic verification role for variances (damage, waste, errors), but they become a quick reconciliation, not a from-scratch reconstruction.

Practical takeaway

• A very small operation with few items and slow movement? Periodic may suffice for now.
• A shop, restaurant or wholesaler with daily movement? Perpetual through a real-time system is a necessity, with physical counts as quarterly reconciliation.

Tips for a faster, more accurate physical count

Fix a recurring schedule outside peak hours and freeze stock movement during the count; divide the warehouse into zones counted once each; scan barcodes instead of writing; and start with your highest-value, fastest-moving items. Then investigate variances immediately — a repeated variance in one item usually reveals an operational problem: unrecorded damage, receiving errors, or shrinkage that needs addressing.