Prime Cost: The One Number Every Restaurant Operator Should Know Cold

What prime cost is

Prime cost is the total of your cost of goods sold, food and beverage, plus your total labor cost, including taxes and benefits. Expressed as a percentage of total sales, it is the single most important number in your restaurant.

Prime cost represents everything you spend to put food and drink on the table and get it served. It is the biggest controllable expense in the business. If you do not know your prime cost, you do not know if your restaurant is actually profitable.

How to calculate it

Add your cost of goods sold for the period to your total labor cost for the same period. Divide that by total sales and multiply by 100.

Example: $14,000 in COGS plus $12,000 in labor, divided by $42,000 in sales. That is $26,000 divided by $42,000, which is 61.9%. Your prime cost is 61.9%.

What good looks like

• Full-service restaurants. Target 55% to 60%. If you are above 62%, you are likely losing money or running on razor thin margins.
• Fast casual. Target 50% to 55%. Lower labor and simpler menus should keep prime cost below 55%.
• Bars and lounges. Target 45% to 55%. Beverage programs carry lower COGS, which pulls prime cost down.

A full-service restaurant running at 65% prime cost when 58% is achievable is losing 7 points of margin. On $1.2 million in annual revenue, that is $84,000 a year walking out the door.

The math on a 5-point improvement

If your restaurant does $1 million a year in sales and you improve prime cost by 5 points, from 63% to 58%, that is $50,000 more in operating profit every year. Five points. That is the difference between struggling and comfortable. Between "I can't afford to fix the hood" and "let's get that done next week."

The improvement almost always comes from two places: food cost and labor. A 2-point reduction in food cost and a 3-point reduction in labor gets you there. We cover both in our guides on food cost percentage and labor cost scheduling.

Why weekly matters more than monthly

Most operators find out their prime cost is a problem when the monthly P&L comes back, 30 days too late. By then, the damage is done. A bad food cost week in week one compounds across the month. A labor overrun in week two sits there until the P&L tells you about it in week five.

The operators who catch prime cost problems early track it weekly. It takes 20 minutes. Pull your sales, your COGS estimate, and your labor cost. Calculate prime cost. If it is above your target, you have one week to fix it, not four. See our guide on the weekly financial review for the full system.

How most operators find out too late

The pattern is always the same. The restaurant feels busy. The owner assumes the money is there. Then the P&L comes back and the profit isn't. The dining room was full but prime cost was 66% and nobody noticed because nobody was looking. Busy does not mean profitable. The only way to know is to track the number.

If you want someone to look at your actual numbers and tell you where your prime cost stands, get a free audit. We will run the math and show you the gap.

The Bottom Line

Prime cost is COGS plus labor as a percentage of sales, and it should run 55% to 60% for full-service and 50% to 55% for fast casual. A 5-point improvement on $1 million in sales is $50,000 in profit per year. Track it weekly, not monthly, because a bad week compounds across the month if nobody catches it. Busy does not mean profitable. The number does.