Prime Cost in Restaurants: What It Is and How to Control It

What Is Prime Cost?

Prime cost is the sum of your two largest controllable expenses: food cost (Cost of Goods Sold) and total labor cost (wages, payroll taxes, benefits). Together, these two line items typically represent 55–65% of restaurant revenue — and they are the expenses that management has the most direct control over.

Prime Cost = Cost of Goods Sold + Total Labor Cost

If your restaurant generates $100,000 in monthly revenue and spends $30,000 on food and $32,000 on labor, your prime cost is $62,000, or 62% of revenue.

Why Prime Cost Is the Most Important Restaurant Metric

Revenue is vanity. Profit is sanity. And prime cost is the metric that bridges the two.

Most restaurant costs (rent, insurance, utilities, equipment) are fixed or semi-fixed — they do not change with volume. Prime cost is variable and directly manageable. A chef can reduce food cost by improving recipes and reducing waste. A manager can reduce labor cost by scheduling smarter. These are real-time levers, not accounting adjustments.

Operators who track prime cost weekly can see problems developing and correct course. Those who track it monthly discover problems after they have compounded.

Breaking Down the Components

Food Cost (Cost of Goods Sold)

Food cost includes all food and non-alcoholic beverage purchases consumed in a period. Calculate it as:

Food COGS = Beginning Inventory + Purchases – Ending Inventory

Target: 28–33% of food revenue, depending on concept type.

Labor Cost

Total labor cost includes all wages (hourly and salaried), overtime, payroll taxes, health insurance, and other benefits. Many operators make the mistake of tracking only hourly wages — salaried management and benefits can add 20–30% on top.

Target: 25–35% of total revenue, depending on service model. Full-service restaurants run higher (30–35%) due to front-of-house staffing ratios.

Strategies to Reduce Prime Cost

On the Food Cost Side

• Implement weekly recipe costing reviews — prices change faster than menus do
• Standardize portions with scales and portioning tools
• Track waste by category and address the highest-cost categories first
• Use AI-driven purchase lists to buy closer to actual consumption
• Engineer your menu to promote high-margin dishes

On the Labor Cost Side

• Schedule against forecasted revenue, not last week's schedule
• Calculate labor cost as a percentage of revenue before publishing the schedule
• Cross-train staff to cover multiple positions — reduces the minimum staffing floor
• Stagger start and end times to align labor with demand peaks, not fixed shifts
• Track overtime proactively — overtime is labor cost at 1.5x, schedule to avoid it

Tracking Prime Cost With Technology

Manual prime cost tracking requires pulling numbers from multiple systems — POS for revenue, purchasing records for COGS, payroll for labor — and reconciling them in a spreadsheet. It is error-prone and usually done too infrequently to catch problems early.

Karu connects your recipe costs, purchase records, inventory, and sales data to calculate a real-time theoretical food cost that updates automatically. Combine this with labor data and you have prime cost visibility in days, not weeks — the difference between managing your costs and reporting on them.

Prime Cost vs. Food Cost: Which to Prioritize?

Track both, but use prime cost for strategic decisions. A restaurant might have a "good" 29% food cost but a terrible 38% labor cost — the food cost number looks fine but the operation is losing money. Only prime cost reveals the complete picture.

The most common trap: cutting food quality to reduce food cost while ignoring a bloated labor line. A 2% reduction in food cost is worth $20K on $1M revenue. A 2% reduction in an excessive labor cost is worth the same $20K — but requires different actions.