Restaurant Prime Cost: The One Number That Predicts Your Profit

Prime cost is the single number that tells you whether a busy restaurant is actually making money. It is food and beverage cost plus total labor, divided by sales, and it matters more than food cost alone because those two expenses are the biggest ones you can control and they constantly trade against each other. Watch only your food cost and you can post a great number while labor quietly eats the profit. Watch prime cost and you see the whole controllable picture in one figure.

Most owners can recite their food cost to the decimal. Ask them their prime cost and you often get a blank look, which is a problem, because prime cost is the number lenders, buyers, and good operators look at first.

TL;DR: Prime cost = (cost of goods sold + total labor) ÷ total sales. For full-service restaurants, aim for 60% or under; past 65% is a warning. It beats watching food cost alone because cutting one half usually pushes the other half up. Calculate it monthly at minimum, weekly if you can, and use your menu to pull both halves down at once.

What is prime cost in a restaurant?

Prime cost combines your two largest, most controllable expenses:

• Cost of goods sold (COGS): everything you buy to serve, meaning food and beverage. This is the same number behind your food cost percentage and your pour cost.
• Total labor: not just hourly wages. Include salaried managers, payroll taxes, workers’ comp, and benefits. The fully loaded figure, not the number on the schedule.

Everything else (rent, utilities, insurance, marketing, repairs, equipment) sits outside prime cost. Those costs are real, but they are mostly fixed and slow to change. Prime cost is where your week-to-week decisions actually land, which is exactly why it is the number to manage.

The prime cost formula

Prime cost (dollars) = COGS + total labor.

Prime cost percentage = prime cost ÷ total sales × 100.

That is the whole formula. A restaurant doing $100,000 in monthly sales with $32,000 in food and beverage cost and $30,000 in fully loaded labor has a prime cost of $62,000, or 62% of sales. The remaining 38% has to cover rent, utilities, marketing, and every other fixed cost before a dollar of profit is left.

What is a good prime cost percentage?

The target moves with your concept, because the two halves shift. A bar carries a low beverage cost but variable labor. Fine dining carries heavy labor for the service and the scratch kitchen. Quick service trims labor with a simpler line. Here are the ranges most independent operators should aim for:

The single rule that travels across all of them: for a typical full-service restaurant, keep prime cost at or below 60% of sales, treat 65% as the line where you act that week, and understand that anything in the 70s is losing money unless your rent is unusually low.

A worked example

Take that same full-service restaurant doing $100,000 a month, and watch what six points of prime cost does to the only line that matters.

Same sales, same rent. An eight-point swing in prime cost erased two thirds of the profit. Over a year that is $96,000. Nothing on the fixed-cost side moved, and no amount of marketing would have covered the gap, because the leak was inside the two numbers you touch every single day.

Notice the trap in the slipping column: food cost went up and labor went up together. That is the normal pattern, not bad luck. A short-staffed line wastes more product and comps more mistakes, so chasing a lower labor number often raises food cost, and the reverse is just as true. This is exactly why prime cost is the number to watch instead of either half alone.

Why prime cost beats watching food cost alone

Food cost and labor are communicating vessels. Push down on one and the other tends to rise:

• Cut labor too hard and prep gets rushed, portioning drifts, waste climbs, and 86’d items turn into comps. Your food cost quietly follows labor up.
• Chase a perfect food cost with everything scratch-made and house-butchered, and labor hours balloon to do all that work.
• Over-schedule for a slow shift and labor spikes with no sales to carry it.

A single-number view hides the trade-off. Prime cost shows it. When you move a lever, you check whether the total improved, not just the half you were staring at.

How your menu moves both halves at once

Here is the part owners miss: the menu is the strongest lever on prime cost, and it works on both halves simultaneously.

• Pricing and mix move the food-cost half. Repricing a popular, thin-margin plowhorse or promoting a high-margin puzzle changes your blended food cost without touching a recipe. The method is in the menu engineering matrix, and the dollar-margin thinking behind it is in most profitable menu items.
• Prep complexity moves the labor half. Every item that needs a dedicated station, a long mise en place, or a specialist is buying labor. Cutting three fiddly dogs can free a prep hour a day, which is real money on the labor line.
• Menu size moves both. A tighter menu means less inventory sitting and spoiling (food cost) and a faster, simpler line (labor). Our guides on how many items belong on a menu and pricing menu items get specific.

All of that only pays off if the version guests actually see matches the one you costed and engineered. A reprice that never reaches the printed to-go menu, or a dog you cut that still shows on your Google listing, leaks the gains right back out. VisibleMenus keeps your QR menu, printable PDF, and Google listing in sync from one upload, so a price change or an 86’d item reaches guests the same day you make the decision, not whenever the old PDF finally gets replaced.

How to calculate and track prime cost

You do not need accounting software to run this. A spreadsheet and an hour a week is enough.

1. Set the period. Weekly is ideal, monthly is the minimum. A quarter is too slow to catch a leak before it costs you real money.
2. Get true COGS. Opening inventory, plus purchases, minus closing inventory, equals what you actually used. Guessing from invoices alone misses spoilage and theft.
3. Load your labor fully. Hourly plus salary plus payroll taxes plus benefits plus workers’ comp. The schedule number understates the real cost by 10 to 20%.
4. Divide by sales for the period. That is your prime cost percentage.
5. Compare to your target and last period. A number in isolation tells you little. The trend tells you everything.
6. Act on the bigger half first. If labor is the one that drifted, fix the schedule before you touch recipes, and vice versa.

Frequently asked questions

What is included in prime cost? Cost of goods sold (all food and beverage) plus total labor (wages, salaries, payroll taxes, and benefits). Rent, utilities, insurance, and marketing are not part of prime cost.

What is a good prime cost percentage for a restaurant? For full-service restaurants, 60% or under is the target and 65% is the warning line. Quick service often runs 55 to 60%, and fine dining can sit as high as 65% because of heavier labor.

How often should I calculate prime cost? Monthly is the minimum. Weekly is far better, because it lets you catch a scheduling or waste problem while you can still fix the current period instead of reading about it after the quarter closes.

What is the difference between prime cost and food cost? Food cost is only one half of prime cost. Prime cost adds labor, which makes it the complete picture of your controllable spend. A great food cost can still sit inside a bad prime cost if labor is out of line.

Can changing my menu really lower prime cost? Yes. Menu pricing and item mix move the food-cost half, and prep complexity and menu size move the labor half. The menu is the one lever that touches both at the same time.

The bottom line

Food cost is a useful number, but it is half a story. Prime cost is the whole controllable story in one figure, and keeping it at or under 60% is what separates a restaurant that feels busy from one that actually banks a profit. Measure it weekly, treat 65% as the line you act on, and use the menu itself as the lever.

For the components that feed it, start with food cost percentage and pour cost. To grow the denominator instead of only shrinking the top, see how to increase average check size.