Inventory Turnover Calculator

It depends heavily on category. Grocery and convenience: 14 to 20x. Health and beauty: 6 to 10x. Electronics: 6 to 10x. Apparel: 4 to 6x. Home improvement: 4 to 6x. Furniture and home decor: 2 to 4x. Jewelry and luxury: 1 to 3x. The Inventory Turnover Benchmarks page carries the full table with target ranges, and the Inventory Turnover Benchmarks Guide (PDF) provides the operational tactics that move each vertical.

The simplest form is (Beginning Inventory + Ending Inventory) / 2. That works for stable, non-seasonal categories. For seasonal or trending SKUs, average the 12 monthly-ending inventory balances instead, otherwise the number is distorted by whichever quarter you happen to be sitting in. The Inventory Management Tracker (Excel) has a monthly average column that computes it correctly.

Always COGS. Using net sales inflates turn by the markup rate and produces a ratio that finance cannot reconcile against the P&L. Both numerator and denominator must be at cost. If your ERP reports inventory at retail, apply the cost complement (1 minus initial markup percent) before running the calculation.

DIO is simply 365 / turnover. A 5x turn = 73 days. A 10x turn = 36 days. Weeks of supply is the same idea in weeks: 52 / turnover. Operators often find DIO or weeks-of-supply easier to act on than the ratio itself, because those units map directly onto reorder cadence and lead time. The Days Inventory Outstanding Calculator is the DIO-first way to run the same math.

Yes, and this is the failure mode most retailers underweight. Very high turn often means chronic stockouts on top sellers. Turn looks impressive on the finance dashboard because inventory is artificially low, but lost sales hide in the numerator. Always pair turn with in-stock percent, sell-through, and category service levels sized through the Safety Stock Calculator. A turn of 8x with 4% stockouts on A items is worse than 5x with 0.5% stockouts.

Average inventory for a SKU on an EOQ policy is roughly EOQ / 2. Smaller EOQ, higher turn. Larger EOQ, lower turn. When category-level turn is below the benchmark and the drivers are structural (order cost too high, holding cost understated), the mechanical lever is smaller EOQ. But cutting EOQ alone without revisiting service levels quietly creates more stockout windows, so the two dials move together.

Monthly, on a rolling 12-month basis, to control for seasonality. Quarterly views miss short-term drift. Annual views miss the interim overcorrections that lock cash quietly. Category leaders should see a rolling-12 turn number as part of their weekly review pack, not a monthly board slide.

SKU rationalization. Most assortments carry a long tail of C-class items that consume cash without contributing meaningful sales. Run ABC classification, prune the bottom decile aggressively, and turnover almost always lifts within a quarter. This is why the Inventory Turnover Guide puts assortment tightening as tactic #1 out of seven.

Four show up repeatedly. Using sales instead of COGS in the numerator. Using ending inventory instead of a monthly average. Comparing turn across categories with radically different holding cost structures (a grocery 15x and a furniture 3x are not the same story). And treating higher turn as unambiguously better without checking in-stock and service level. The Inventory Turnover Guide covers each with a fix.

It depends on COGS and starting turn. This calculator returns the exact number for your inputs in the "Cash Freed if Turn Rises by 1x" secondary output. On a $500,000 COGS business turning at 5x, going to 6x releases about $16,700 of working capital. On a $10 million COGS business turning at 5x, the same one-turn improvement releases $333,000. Turn matters more the larger the operation, which is why finance teams at bigger retailers push turnover harder than at smaller ones.