Restaurant Prime Cost: What It Is, How to Calculate It, and What Yours Should Be

If I could only look at one number in your restaurant, it wouldn't be sales. It wouldn't be the bottom line either. It would be prime cost.

The bottom line tells you the score of a game that already ended. By the time the P&L shows up and it's bad, the decisions that made it bad are two months old. Prime cost is different. You can calculate it every single week, it covers the two biggest numbers you actually control, and when it moves, you can do something about it before the month is gone.

Here's what it is, how to work it out, what yours should be, and where the points usually hide.

What prime cost is

Prime cost is your cost of goods sold plus your total labor, divided by your sales.

• Cost of goods sold (COGS): everything you buy to make what you sell. Food, beverage, liquor, beer, wine. Not paper goods, not cleaning supplies.
• Total labor: all of it. Hourly wages, salaried managers and chefs, overtime, payroll taxes, and benefits. Owners leave out payroll taxes all the time, and it makes the number look better than it is.

Those two lines are usually 55 to 70 cents of every dollar that comes through your door. Rent, utilities, insurance and marketing all come out of whatever's left. That's why prime cost decides your year.

How to calculate it

The formula is simple:

Say you did $100,000 in sales last month. You spent $31,000 on food and beverage, and $30,000 on labor including taxes.

That restaurant is keeping $39 of every $100 to cover everything else and still make a profit. Tight, but workable. At 67%, it would be keeping $33, and on most restaurants' rent that's where the money disappears.

Weekly vs. monthly. For your Monday check, use last week's purchases as your food cost. It's not perfect, because a big Friday delivery lands in one week and gets used in the next, but it's close enough to steer by. Once a month, do it properly with inventory: opening inventory, plus purchases, minus closing inventory. That's your true cost of goods.

If you want to skip the math, our free prime cost calculator does it in two minutes.

What your prime cost should be

Here's what I use as a starting point for most independent restaurants:

Your concept moves those numbers. A steakhouse runs a higher food cost and defends it with check average. A coffee shop or bar runs lower food cost, and often higher labor. Quick service and fast casual can usually land in the mid-50s. So don't copy somebody else's targets, including mine. Set yours to your concept, then hold them.

The magic isn't the exact number. It's watching the same number every week and refusing to look away.

Why one point matters more than you think

Every point of prime cost on a $1 million restaurant is $10,000 a year. Five points is $50,000. That's not new sales you have to go chase. It's money you're already earning and handing back.

I worked with an owner I'll call Teresa. Family place, about 80 seats, open eleven years, lines on the weekend. She worked six days a week and took home less than her best server. Her prime cost was 65%: food at 34%, labor at 31%.

We printed her P&L and read it together, line by line, with a pen. It took a little under two hours. By the end she'd circled nine lines she couldn't explain: two produce vendors, protein prices that had crept up, a full crew on slow Tuesdays, prep overtime nobody had approved. Over 90 days she got a little over four points of prime cost back. That's about $45,000 a year, found in a document she already owned. No new POS, no menu redesign, no marketing spend.

The first fix is almost always free. It costs 90 minutes and a pen.

Where prime cost leaks: the food side

Portions. This is the big one. Two cooks can make the same sandwich, one with three slices of tomato and one with four. Nobody notices the difference except your P&L. I worked with a family entertainment center where one tuna item was selling like crazy. Great, right? Their food cost on those tuna dishes was running in the mid-70s. When we costed the recipe, we found out why. It had been priced on a half portion of tuna, and the chef was plating the whole thing. Nobody was stealing. The recipe card just didn't match the plate.

We didn't pull it off the menu, because people were coming in for it. We re-costed it, made it a limited nightly special, and raised the price a dollar at a time. People kept paying, because it was the dish they came for.

Recipe costs that are out of date. A recipe costed two years ago is fiction. A couple of years back, when shell egg prices spiked, a case went from about $35 to over $150. The restaurants that weren't watching their invoices kept selling the same breakfast at the same price and lost money on every plate. Update your recipe costs from your invoices at least once a month, and weekly on your most expensive items: proteins and seafood.

No cushion for waste. I add a Q factor of 10 to 15% to every recipe cost. That covers the spilled beans, the overcooked steak, the plate that comes back. If you cost a recipe assuming nothing ever goes wrong, your real food cost will always come in higher than your sheet.

Waste nobody writes down. Keep a waste log by the trash, one line per toss: what, how much, why. Read it every week. Sunday's ambitious prep turns into Tuesday's waste, and the log shows you exactly where.

Where prime cost leaks: the labor side

Schedules built by habit. Most schedules are last week's schedule, copied forward. But every day has its own sales shape. Build the schedule from a sales forecast instead, and bring people in as the sales come in, not all at open.

Early clock-ins. At one location we saved $70,000 just by having staff come in at 8:30 instead of 8:00. Ten employees, half an hour each, every day. It looks like nothing on any single shift, and it's huge over a year.

Overtime you didn't choose. Overtime should be a decision you made for a busy night, never a surprise on the payroll report. Review it every Monday, before the week starts.

I go deeper on labor in How to Lower Restaurant Labor Cost.

Make it a Monday habit

Prime cost only works if you look at it every week, at the same time. Here's the routine I set up with every client:

1. Every Monday, pull last week's sales, food and beverage purchases, and total labor from your POS and payroll.
2. Calculate prime cost and put it on a one-page scorecard next to the last few weeks.
3. Have your manager present it, not you. They're the ones ordering and scheduling, so they should own the explanation. "We ordered 300 extra pounds because of the event on the 18th." Good. Now you know.
4. Pick one thing to fix this week. Just one.

That's 15 to 30 minutes. It trades big quarterly surgery for small weekly corrections. In my experience, the Monday check alone is worth a point of prime cost.

The short version

• Prime cost = (food and beverage cost + total labor) ÷ sales.
• For most independents, aim for 60% or under. Over 65%, the money is gone before rent.
• One point on a $1 million restaurant is $10,000 a year.
• The leaks are usually portions, stale recipe costs, waste, schedules built by habit, and overtime nobody chose.
• Calculate it every Monday. Have your manager present it.