How to Calculate Prime Cost for Your Restaurant (And Why It Matters More Than Food Cost Alone)
Most restaurant owners track food cost. Fewer track prime cost — and that's a problem. Food cost only tells you part of the story. Prime cost adds labor into the equation, and labor is where most restaurants actually bleed money. If your food cost looks fine but profits are still thin, prime cost is almost certainly the reason. This guide walks you through exactly how to calculate prime cost for your restaurant, what the industry benchmarks are, and what to do when your number is too high.
TL;DR
- Prime cost = Cost of Goods Sold (COGS) + Total Labor Cost
- The industry benchmark is under 65% of total sales — ideally 55–60%
- Prime cost is more actionable than food cost alone because labor is controllable week to week
- Track it weekly, not monthly, so you can catch problems before they compound
What Prime Cost Is and Why It Beats Food Cost Alone
Prime cost is the single most important number in your restaurant's financial picture. It combines your two largest, most controllable expenses — food and labor — into one ratio that tells you whether your operation is fundamentally profitable.
Food cost percentage alone is incomplete. A restaurant can have a "good" food cost of 28% and still fail because labor is running at 42%. Prime cost catches that. It also forces you to look at both levers simultaneously, which is how real decisions get made: when prime cost spikes, you need to know whether food or labor is driving it before you can fix it.
The Prime Cost Formula and a Worked Example
Prime Cost = Cost of Goods Sold + Total Labor Cost
Prime Cost % = Prime Cost ÷ Total Revenue × 100
Total Labor Cost includes everything: hourly wages, salaried employees (prorated), payroll taxes, and benefits. Don't leave out manager salaries — that's a common mistake.
Here's a concrete example:
| Line Item | Monthly Amount |
|---|---|
| Total Revenue | $80,000 |
| Food & Beverage COGS | $28,000 |
| Total Labor Cost | $24,000 |
| Prime Cost | $52,000 |
| Prime Cost % | 65% |
In this scenario, the restaurant is sitting right at the industry warning line. Food cost is 35% and labor is 30%. That leaves only 35% of revenue to cover rent, utilities, repairs, marketing, and profit — which is tight. The goal is to get prime cost below 65%, ideally into the 55–60% range.
If prime cost were 58% on $80K revenue, that's $46,400 — freeing up $5,600 more per month compared to 65%. That difference is often the gap between breaking even and actually making money.
Breaking Down a High Prime Cost
When your prime cost is too high, the first step is isolating which component is the problem.
If food cost is the driver:
- Run a variance report comparing theoretical vs. actual food cost
- Check for over-portioning, waste, or spoilage
- Review your most expensive menu items — see How to Calculate Food Cost for the full methodology
If labor is the driver:
- Calculate your sales-per-labor-hour by shift and daypart
- Look for overstaffing during slow periods
- Check whether your scheduling matches your actual cover counts
If both are elevated:
- Start with food — it's usually faster to fix
- Then build a labor schedule based on projected sales, not habit
Most operators who run high prime cost have at least one of these issues: food waste they're not measuring, labor scheduled by feel rather than data, or a menu that hasn't been repriced in over a year.
Weekly vs. Monthly Tracking — Why Weekly Wins
Monthly prime cost reporting is better than nothing. Weekly prime cost reporting is what actually changes behavior.
When you track monthly, a bad week in the middle of the month gets averaged out. You don't see it until weeks later, and by then the problem has repeated itself multiple times. Weekly tracking surfaces problems in real time when you can still act.
The practical approach: pull your food purchases and labor from payroll every Monday morning for the prior week. Calculate your weekly prime cost %. If it's trending up, you have six days to diagnose and correct before the next week starts.
A common weekly target: keep prime cost below 65% in any given week. If a week hits 70%+, treat it as an immediate alert — something is wrong and needs a root cause, not just a hope that next week will be better.
How Prime Cost Connects to Menu Pricing
Prime cost is the foundation for any honest menu pricing conversation. If your prime cost is structurally 68% and your rent is 10% of sales, you're already underwater before any other expense. You can't cut your way to profitability from that position — you need to either raise prices or reduce COGS and labor simultaneously.
Run your prime cost before you set menu prices, not after. If your target prime cost is 60% and food cost should be 30%, you know labor needs to stay at or below 30%. That labor constraint then drives your scheduling decisions. Pricing, portioning, and scheduling all connect through prime cost — which is why it's a more complete management tool than food cost percentage alone.
For a full walkthrough on pricing individual dishes based on food cost targets, see How to Price Menu Items at a Small Restaurant.
Frequently Asked Questions
What is a good prime cost for a restaurant? The industry benchmark is under 65% of total revenue. Full-service restaurants should target 55–60%. Fast-casual and QSR concepts can often achieve 50–55% due to lower labor intensity. If you're above 68%, it warrants immediate investigation into both food and labor spending.
Should I include manager salaries in prime cost labor? Yes. Total labor cost should include all wages and salaries for people who work in the restaurant — front of house, back of house, kitchen managers, and general managers. Payroll taxes and any employer-paid benefits count too. Leaving out salaried staff understates your true labor cost.
How is prime cost different from food cost percentage? Food cost percentage only measures what you spend on ingredients relative to sales. Prime cost adds labor, which is typically 25–35% of revenue on its own. An operator could have a 28% food cost and a 38% labor cost — food looks fine, but prime cost of 66% signals a real profitability problem.
Key Takeaways
- Prime cost = COGS + total labor cost; the target is under 65% of total sales
- Track prime cost weekly to catch problems while you can still fix them in-cycle
- When prime cost is high, isolate whether food or labor is the primary driver before acting
- Prime cost should inform both menu pricing and scheduling decisions — they are connected
Dinezy tracks your beginning and ending inventory values automatically — giving you two of the three COGS inputs for your weekly prime cost calculation without rebuilding the formula every Monday. Try Dinezy free at dinezytech.com.