Prime Cost: The Number That Makes or Breaks Your Restaurant

Most restaurateurs understand how important it is to maintain sustainable net profit margins and that restaurants face slimmer margins than most other industries, typically in the 3% to 6% range. The number that determines whether your doors stay open is your prime cost.

Prime cost is the cost of goods sold (food and beverage) plus the total cost of labor. Labor goes beyond hourly wages to include management salaries, payroll taxes, workers' compensation, and benefits. Add the two together and divide by total sales.

Prime Cost % = (COGS + Total Labor) ÷ Total Sales

Understanding your prime cost is valuable because food cost and labor trade against each other. Buy pre-cut produce, and your food cost rises while prep labor falls. Bring butchery in-house, and the reverse happens. Watch either number in isolation, and a win can look like a loss. Prime cost measures the full cost of producing and serving what you sold, which is why it is the more honest number. Full-service restaurants generally target 60–65%, while efficient operations sit closer to 55–60%.

Owners and managers should count inventory on a consistent weekly schedule and track labor against sales in real time during the shift. It takes work, but it is well worth it. A monthly P&L arriving on the 15th is a post-mortem. By the time you see the damage, half the next month has been run the same way.

When vendor increases and spoilage go unnoticed, prime cost creeps up. Menu pricing is the most visible lever to pull, but the drift usually starts somewhere less obvious: portions that grew, or a schedule built on habit rather than forecast. Caught early, the fix is routine. Ignored, it sinks the ship.