Inventory Turnover

Inventory turnover is a ratio that shows how many times a business uses or sells through its average inventory during a defined period. In a restaurant, food inventory turnover helps managers understand how quickly stock is consumed and replenished. It can reveal whether purchasing levels, storage quantities and menu demand are aligned.

Inventory turnover formula

Inventory turnover = cost of goods used during the period ÷ average inventory value.

Average inventory is commonly calculated as:

(Opening inventory + closing inventory) ÷ 2.

Restaurant example

If food cost of goods used for a month is $40,000 and average food inventory is $10,000, turnover is 4 times for that month. A simple estimate of days of inventory is 30 days ÷ 4, or 7.5 days. Use the actual number of days in the period when making a precise comparison.

What inventory turnover tells a manager

• High turnover: stock is moving quickly, which may reduce storage needs but can increase the risk of stockouts if purchasing is not well planned.
• Low turnover: stock is moving slowly, which may indicate over-purchasing, low sales, excessive par levels or items at risk of spoilage.
• Category differences: meat, seafood, produce, dry goods and beverages have different shelf lives and purchasing patterns, so they should not always be judged against one target.

Inventory turnover versus food cost percentage

Inventory turnover measures how quickly stock is consumed relative to average inventory. Food cost percentage measures food cost as a proportion of food sales. A restaurant can have a good food cost percentage but still hold too much inventory, or have high turnover while suffering from poor purchasing prices or waste.

How to improve turnover responsibly

Align par levels with demand, order more frequently where practical, review slow-moving products and coordinate purchasing with menu planning. Do not reduce stock so far that the kitchen cannot meet demand or maintain product quality.

Chef’s tip: calculate turnover consistently by category and period, using cost of goods used rather than purchases alone. Compare trends alongside waste, stockouts and supplier lead times.