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.

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.

Related Tools