What Is Prime Cost in a Restaurant? (And Why It's the Only Number That Matters)
If you could track only one financial metric in your restaurant, prime cost should be it. Here's what it is, how to use it, and what your number should be.
Prime Cost, Defined
Prime cost is the sum of your two largest controllable expenses — cost of goods sold (food and beverage) and total labor cost — expressed as a percentage of total sales.
Why these two specifically? Because they're the expenses you can actually manage week to week. Rent, insurance, and depreciation are locked in. Food purchasing, scheduling, and portioning are not.
Why Prime Cost Beats Food Cost and Labor Cost Alone
A restaurant running 35% food cost and 28% labor cost has a prime cost of 63%. Another running 28% food cost and 35% labor cost also has a prime cost of 63%. Both restaurants are equally profitable at the controllable level — even though their individual cost structures look very different.
This matters because different concepts naturally carry different ratios. A sushi restaurant will have high food cost and lower labor cost. A brunch spot will have lower food cost but higher labor (more servers, longer prep). Tracking food and labor separately without combining them can make a perfectly healthy restaurant look like it has a problem.
Prime Cost Benchmarks
Quick-service / fast casual: 55–60%. Lower service costs and simpler operations keep this tight.
Full-service / casual dining: 60–65%. The most common target range. Above 65% usually means either food or labor (or both) need attention.
Fine dining: 63–68%. Higher than casual, but offset by significantly higher average checks.
The danger zone: anything above 70% persistently. At that level, you're left with less than 30% of sales to cover rent, utilities, maintenance, marketing, and profit. For most restaurants, that's not enough.
Food & Beverage Cost: AED 52,000
Total Labor Cost: AED 48,000
Total Sales: AED 165,000
Prime Cost: (52,000 + 48,000) ÷ 165,000 × 100 = 60.6%
This is within the healthy range for a full-service restaurant.
Calculate your prime cost in 10 seconds.
Open Prime Cost Calculator →How to Use Prime Cost Week to Week
Set a target. Based on your concept, set a prime cost ceiling — say 63%. This becomes your controllable P&L target.
Track weekly. Pull COGS and labor every week, not monthly. Monthly is too slow — by the time you see a problem, the damage is done.
Diagnose by component. If prime cost spikes, ask: was it food, labor, or both? If food cost spiked, check waste logs and supplier invoices. If labor spiked, check the schedule against actual sales.
Balance, don't just cut. The goal isn't to minimize both food and labor — it's to keep their combined total under your ceiling. Cutting labor too aggressively hurts service and drives sales down, which makes the percentage worse, not better.
Prime Cost and Break-Even
Your prime cost percentage directly affects your break-even point. A restaurant with 60% prime cost keeps 40 cents of every dollar to cover fixed costs and profit. A restaurant with 70% prime cost only keeps 30 cents. That means the 70% restaurant needs to sell roughly 33% more just to cover the same fixed costs.
See how prime cost affects your break-even point.
Open Break-Even Calculator →The food and labor trade-off
The reason prime cost exists as a metric, rather than food cost and labor cost being tracked separately, is that the two are not independent. Almost every operational decision moves cost between them:
- Buying pre-portioned proteins raises food cost and lowers labor cost.
- Butchering whole primals in house lowers food cost and raises labor cost.
- Bought-in desserts raise food cost and lower labor cost.
- Making stocks and sauces from scratch lowers food cost and raises labor cost.
Judge each of these on its effect on prime cost, never on either component alone. A chef reporting a two-point food cost reduction has achieved nothing if it cost three points of labor, and looking only at food cost would hide that entirely. This is also why prime cost is difficult to game: you cannot improve it by moving work around, only by genuinely reducing total cost or raising sales.
How to reduce prime cost
Diagnose which component is driving the problem before acting, because the wrong intervention makes things worse.
If food cost is the driver, compare theoretical against actual food cost to size the waste and portioning gap, audit your top ten ingredients by spend for unnoticed supplier increases, and check portion discipline with scales on the line.
If labor is the driver, attack overtime first, match shift start times to the actual demand curve, and separate fixed from variable labor — if variable labor per cover is flat but the percentage rose, you had a sales problem and cutting shifts will damage service without addressing it.
The lever most operators overlook is the denominator. Prime cost is a ratio, so raising menu prices by 3% lowers it without touching a single cost line. If your costings show prices have fallen behind ingredient inflation, repricing is usually faster and less damaging than cutting.
Building the weekly habit
Monthly prime cost is a post-mortem; weekly prime cost is a management tool. A workable routine:
- Count inventory the same day each week, before service, on your quietest morning.
- Pull sales for exactly the period the count covers.
- Accrue labor to that week rather than using the payroll run date.
- Record the total and both components separately, so you can see which one moved.
- Investigate any two-point swing the same week, while people still remember the details.
Four data points a month reveal trends a single monthly figure cannot, and more importantly they let you act inside the period rather than reading about the problem after it has finished costing you money.
Frequently asked questions
What is prime cost in a restaurant?
Prime cost is cost of goods sold plus total labor cost, expressed as a percentage of sales. It captures the two largest controllable costs in one figure.
What is a good prime cost percentage?
Most full-service restaurants target 60-65%, quick-service 55-60%, and fine dining 63-68%. Persistently above 70% signals a cost or pricing problem in any concept.
Does prime cost include beverage cost?
Yes. The standard definition uses total COGS, food and beverage combined, plus total labor. Some operators also track a food-only variant internally, which is fine if applied consistently.
Why track prime cost instead of food cost and labor cost separately?
Because the two trade off against each other constantly. Prime cost captures the total regardless of how work shifts between them, which makes it much harder to game.
How often should prime cost be tracked?
Weekly. A monthly figure arrives after four weeks of overspending have already happened, leaving nothing to act on within the period.
Can I have a good food cost and a bad prime cost?
Easily, and that is precisely why prime cost exists. A 27% food cost achieved through heavy prep labor can produce a worse prime cost than a 33% food cost with lean staffing.