What's a good prime cost for a restaurant? (And how to get there.)

If you ask ten restaurant operators what the most important number on their P&L is, eight of them will say prime cost. The other two are looking at the wrong P&L.

Prime cost is the sum of two costs — what your food cost you, and what your labor cost you — divided by what you sold. It's a single number that captures the two big variable costs in a restaurant. Almost everything else on the income statement is fixed (rent, royalties, insurance) or small (utilities, marketing, repairs). Prime cost is the part of the business you can actually move week-to-week with a smart schedule, a tighter inventory count, and a menu mix that pulls in margin instead of leaking it.

Here's the rule of thumb most operators run by:

• Under 55% — healthy. You're keeping enough margin after the two biggest costs to cover everything else and still take home a real profit.
• 55–60% — okay. Watch the trend. If it's drifting up week-over-week, something's leaking.
• 60–65% — tight. You're running a business where a slow week could kill the month.
• Over 65% — bleeding. Every dollar of revenue is barely covering what it cost to make and serve. Something structural is wrong: pricing, portioning, scheduling, or the concept itself.

These bands shift a little by concept — fine dining absorbs higher prime cost because the average ticket is higher; QSR runs leaner because volume is the model — but the framing holds across the board.

Why prime cost specifically — and not, say, food cost or labor on their own

Because food cost and labor are connected.

If you tighten the schedule too aggressively, food cost goes up because the line is rushed and portioning gets sloppy. If you over-staff, labor goes up but food cost stays flat. Neither number alone tells you whether the day was profitable. Prime cost together does.

It's also the only number on a restaurant P&L where the operator has direct, daily control. Rent doesn't negotiate. Utilities don't move much. Marketing is small. Royalties are fixed if you're a franchise. The two levers that actually move are the ones inside prime cost — what you bought, and who you scheduled.

How to compute it (with real numbers)

Imagine a Tuesday. You did $4,800 in net sales. Your COGS for the day — food, beverage, paper, packaging — totaled $1,440. Your fully loaded labor — hourly wages plus salaried allocation plus payroll taxes and benefits — totaled $1,250.

That's:

• COGS: $1,440 ÷ $4,800 = 30%
• Labor: $1,250 ÷ $4,800 = 26%
• Prime cost: ($1,440 + $1,250) ÷ $4,800 = 56%

Healthy day. Just on the edge of "watch the trend" but not yet a problem.

The trick is doing this every day instead of waiting for the bookkeeper to send a P&L on the 12th of the following month. By then the leak already happened. Daily visibility means you catch a 62% prime-cost day on Wednesday and adjust Thursday's schedule, instead of finding out three weeks later that all of last month was running 62%.

(If you want a pre-built worksheet that does the math for you, we made one — free download at the bottom of this article.)

How to actually move prime cost down

Three levers, in order of leverage:

1. The schedule is the biggest weekly lever

Most restaurant operators write the schedule from a place of optimism — "we'll need extra hands in case it gets busy" — and end up with labor running 32–35% on slow days. The fix is forecasting based on actual recent data: pull the last six weeks of hourly sales for that day of the week, look at the actual demand curve, and staff to it.

If you're a franchisee with a POS that gives you hourly sales by daypart, you have everything you need. The pattern is almost always the same: dead before 11:30am Tuesday, so don't open at 10am that day. Slow between 2 and 5pm Wednesday, so it's a one-person bar period.

A 1-percentage-point reduction in labor on a $1.8M/year restaurant is $18,000/year going straight to the bottom line. That's worth a careful Sunday.

2. Food cost variance is usually a recipe-and-portioning problem

Food cost drift week-over-week is almost never a price problem (vendor prices change in steps, not in drift). It's almost always a portion problem.

The way to spot it: do a physical inventory count once a week. Compare what your recipes say you should have used (theoretical usage) to what you actually used (theoretical inventory minus actual inventory). The gap is shrinkage — waste, theft, over-portioning, or spoilage. Industry data suggests 2–10% of revenue leaks here for the average operator.

The line cook who's been there three years and is now portioning the chicken parmigiana 15% bigger than the recipe? That's costing you 1–2 points of food cost. Tightening the portioning back to spec is one conversation and it pays for itself the first week.

3. Menu mix is the lever you should pull least often, but biggest when you do

Some menu items make money. Some are loss-leaders. Some look profitable but actually drag the average down because of low velocity at high cost.

Menu engineering — sorting your items into stars (high margin, high volume), workhorses (high volume, lower margin), puzzles (high margin, low volume), and dogs (low margin, low volume) — tells you what to push, what to reprice, and what to cut. Don't do this every quarter; do it once or twice a year and follow through. A single dog removed from the menu is two points of food cost recovered.

What good operators actually do

The operators who run prime cost under 55% sustainably aren't doing anything magical. They're doing four small things every day:

1. They look at the previous day's prime cost first thing in the morning. Five minutes.
2. They adjust today's schedule if labor was high yesterday and demand is similar today.
3. They count critical inventory items (proteins, alcohol, specialty ingredients) once a week and reconcile against theoretical usage.
4. They look at their menu's profitability twice a year and act on what they find.

The compounding effect of those four habits is the difference between a 4% net income operator and a 12% net income operator on the same revenue.

Want the worksheet?

We built a free Restaurant Daily P&L Cheat Sheet — a worksheet that auto-computes prime cost, food cost %, labor %, and net income, with status flags so you know at a glance whether yesterday was a healthy day. Plus an 8-page guide with the five-minute daily ritual and benchmarks by concept (QSR / fast-casual / casual / fine dining).

Get the cheat sheet (free, no credit card) →

If you'd rather not do this manually every day, EasyShiftHQ connects your POS, payroll, and bank and shows you yesterday's prime cost every morning by 8am. 14-day free trial, no credit card.

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Jose Delgado runs a Cold Stone Creamery / Wetzel's Pretzels co-brand at Alamo Ranch in San Antonio. He built EasyShiftHQ because he was tired of finding out two weeks late which Tuesday lost money.