Prime cost is the sum of food cost and labor cost, expressed as a percentage of revenue — (food cost + labor cost) ÷ revenue × 100. It is the single most-watched efficiency metric in food and beverage operations because it captures the two largest controllable cost categories in one ratio, and because consistently running a prime cost above 65% almost always signals that the business is not generating enough margin to cover overhead and remain profitable.
Food cost is the procurement side of prime cost. Labor is the scheduling and management side. They move differently, they are managed differently, and they have different levers — but they share the same denominator (revenue) and the same consequence when they run high together. Closed-loop procurement addresses the food cost half: the buying workflow that connects demand signals, purchase orders, supplier replies, receiving, and accounting handoff in one continuous record without manual re-entry. That is what closed-loop procurement describes — and controlling the food cost component of prime cost is where procurement discipline, receiving accuracy, and recipe costing all converge.
Quick answers
What is prime cost? Prime cost is food cost plus labor cost as a percentage of revenue. It is the sum of the two largest variable operating expenses in a food business. If food cost % is 30% and labor cost % is 33%, prime cost is 63%.
What is the prime cost formula? Prime Cost % = (Food Cost + Labor Cost) ÷ Revenue × 100. Alternatively: Prime Cost % = Food Cost % + Labor Cost % — the two percentages add directly because they share the same revenue denominator.
What is a good prime cost for a restaurant? Industry guidance targets prime cost below 60–65% of revenue. Full-service restaurants typically operate in the 60–65% range; quick-service and high-volume fast-casual operations can run 55–60%. A prime cost above 65–70% rarely produces enough margin to cover occupancy, utilities, and profit, regardless of sales volume.
What is the difference between prime cost and food cost? Food cost is only ingredient and raw-material cost. Prime cost adds labor cost (wages, payroll taxes, and benefits) to food cost. Prime cost is the more complete picture of controllable cost; food cost is the procurement-specific component within it.
How often should I calculate prime cost? Weekly is the operational standard. Monthly prime cost is useful for trend analysis and investor reporting, but by the time a monthly figure reveals a problem, four or five weeks of margin have already been lost. A weekly prime cost calculation — requiring a weekly inventory count — is the minimum frequency that allows operators to intervene before a bad week becomes a bad quarter.
The formula
Prime Cost % = (Food Cost + Labor Cost) ÷ Revenue × 100
Where:
- Food cost = cost of ingredients and raw materials used in the period. The precise formula is beginning inventory + purchases − ending inventory, using received costs at confirmed supplier prices. See food cost percentage for the full breakdown.
- Labor cost = all labor-related expenses: wages, hourly and salaried, plus payroll taxes, employer health contributions, and any other direct payroll costs. Tips paid through the employer may or may not be included depending on the operation's model and accounting treatment.
- Revenue = food and beverage revenue for the same period. Use net sales (after comps, voids, and discounts), not gross sales. If the business separates food revenue from beverage revenue, use total net sales for the prime cost denominator — a food-only denominator would overstate food cost % and make prime cost appear worse than it is.
A worked example for a single-location full-service restaurant, one week:
| Item | Amount |
|---|---|
| Beginning inventory | $8,200 |
| Purchases received | $12,400 |
| Ending inventory | $7,900 |
| Food cost (COGS) | $12,700 |
| Labor cost (wages + taxes) | $14,100 |
| Total prime cost | $26,800 |
| Net food + beverage revenue | $43,000 |
| Food cost % | 29.5% |
| Labor cost % | 32.8% |
| Prime cost % | 62.3% |
At 62.3%, this operation sits within the benchmark range for full-service. Overhead (rent, utilities, marketing, insurance) typically runs 15–20% of revenue for a stand-alone location. With a prime cost of 62.3%, the business has 37.7% of revenue to cover overhead and generate profit — which is tight but workable if occupancy is not unusually high.
Industry benchmarks
| Operation type | Typical prime cost % | Food cost component | Labor cost component |
|---|---|---|---|
| Full-service restaurant | 60–65% | 28–35% | 28–35% |
| Fast casual / quick service | 55–62% | 26–32% | 28–34% |
| Fine dining | 60–70% | 30–38% | 30–38% |
| Bakery | 58–68% | 28–38% | 28–35% |
| Coffee shop | 52–62% | 20–28% | 30–38% |
| Bar (food + beverage) | 55–65% | 20–28% | 30–38% |
| Ghost kitchen / virtual brand | 58–68% | 27–35% | 28–35% |
| Catering (per-event) | 55–70% | 28–38% | 25–35% |
These are ranges, not targets. The right prime cost for a specific operation depends on its revenue model, service format, local labor market, supplier relationships, and menu engineering. An operation hitting 68% prime cost but running very low occupancy cost may outperform a 60% prime cost restaurant in a high-rent urban location. Benchmark comparisons are most useful for identifying whether food or labor is the outlier — not for setting a universal target.
Diagnosing prime cost overruns
A prime cost above target is almost always caused by one or both components running high. The first diagnostic step is to split the ratio.
High food cost, labor in range. The problem is in the kitchen and the procurement cycle. The most common causes:
- Untracked supplier price increases: the purchase order was created at one price, the supplier shipped at a higher price, and the system never updated. The extra cost enters the food cost formula without a corresponding revenue increase.
- Receiving variances not recorded: 18 cases were delivered, 20 were invoiced, and the system recorded 20. Inventory is overstated; food cost appears correct but will produce a large variance at the next physical count.
- Recipe cost drift: recipes were built at ingredient prices from six months ago. Actual purchase prices have increased, but recipe costs have not been updated. Theoretical food cost % is lower than actual food cost %, and the gap is invisible until accounting reports it.
- Spoilage from over-ordering: perishables are ordered in quantities above what the sales mix actually demands. The excess spoils. The cost is in purchases but the revenue never materializes.
High labor, food cost in range. The problem is in scheduling, throughput, and labor management — outside the scope of procurement.
Both components elevated. This is the most dangerous pattern. It is often a revenue problem disguised as a cost problem: volume dropped, fixed labor commitments did not adjust, and food costs did not fall proportionally because minimum order quantities and low-volume spoilage dynamics kept per-unit costs high. In these cases, prime cost improvement requires both revenue recovery and cost-side discipline simultaneously.
Food cost in range, prime cost above target. This pattern occurs when labor is significantly above benchmark. It can also occur when the revenue denominator is lower than expected — check whether comps, voids, or discounts have grown disproportionately.
Why procurement determines the food cost half
Labor cost is set by scheduling decisions, wage rates, and service format. Procurement sets food cost. The two halves of prime cost have almost no overlap, which means food cost control is entirely within the procurement and kitchen discipline domain.
Three procurement mechanisms have the most direct impact on the food cost component of prime cost:
Supplier price capture at the order stage. Every untracked price change a supplier applies — between the PO price and the confirmed price, or between the confirmed price and the invoice — increases food cost without a compensating revenue change. For a restaurant spending $50,000/month on food, a 2% average price-increase gap between PO and invoice is $1,000/month in untracked food cost — roughly 1–2 percentage points of prime cost, compounded over twelve months. Procurement systems that absorb supplier confirmation replies and update the PO before the invoice arrives catch this at the source. See purchase price variance for the formula.
Receiving accuracy against the confirmed order. When the system records 10 cases received but only 8 arrived, beginning inventory for the next period is overstated by 2 cases. The food cost formula understates COGS for the current period and then overstates it in the next period when the phantom inventory disappears. More immediately: the invoice may be approved for 10 cases, creating an over-payment. A receiving workflow that compares delivered quantities against the supplier-confirmed PO catches short deliveries before the invoice is approved and before inventory records are corrupted. See goods received note for what that documentation requires.
Reorder quantities calibrated to actual demand. Over-ordering on high-decay items (fresh protein, leafy greens, dairy) is a direct food cost input that does not appear on a waste log. A kitchen may be portioning to spec perfectly while food cost % runs above theoretical, because 8–12% of perishable purchases are spoiling before service. Statistical reorder calculations that model decay rate and demand variability reduce this systematically. See PAR level for the formula and Syntetos–Boylan Approximation for the demand classification methodology that determines when SBA forecasting applies versus simpler approaches.
How LineNow closes the food cost half of prime cost
Prime cost has two halves. LineNow owns the food cost half — not the labor scheduling half, but the entire procurement-to-accounting sequence that determines what food actually costs.
Order quantities from POS and recipe demand. LineNow maps POS sales through recipe bills of materials to compute daily ingredient consumption. Reorder quantities apply demand classification and decay modeling so perishable quantities arrive closer to what the sales mix will actually consume. Over-ordering on fast-turning fresh items is reduced before it becomes a food cost problem.
Supplier price updates at the confirmation stage. When a supplier replies to a purchase order — by email, WhatsApp, EDI, or portal — LineNow reads the reply and updates the PO with confirmed prices. If the confirmed price differs from the ordered price, the gap is visible on the living PO before the invoice arrives. Recipe costs linked to those supplier prices update automatically, keeping theoretical food cost % grounded in current procurement reality.
Receiving reconciliation before the invoice is approved. LineNow's receiving workflow compares delivered quantities against the supplier-confirmed PO. Shorts, substitutions, and damaged goods are recorded at the dock. The cost that enters the food cost formula is the verified received cost, not the invoice estimate. When the invoice arrives, it is matched against a reconciled receiving record — not reconstructed from memory.
Accounting handoff. Confirmed and received POs flow to QuickBooks Online or Xero as reconciled bills. The purchases input to the food cost formula is sourced from matched procurement data, which closes the gap between theoretical and actual food cost % down to what it should measure: kitchen portioning and waste discipline, not procurement tracking failures.
Operators using this workflow have one lever left on the food cost half of prime cost: operational discipline in the kitchen. The procurement-side leakage — supplier price drift, receiving variances, over-ordering spoilage — is handled upstream.
Start your 90-day free trial at linenow.co — connect your POS, load your recipes, and see your food cost component of prime cost managed in one closed-loop system. $100/month per business unit after trial.
Related
- Food Cost Percentage: Formula, Benchmarks, and Why Procurement Determines It — the food cost component of prime cost in full detail: the COGS formula, theoretical vs. actual gap, and how supplier pricing, receiving, and reorder accuracy each move the number
- Gross Margin: Formula, Benchmarks, and How Procurement Controls It — gross profit is what remains after food cost (and total COGS); prime cost is the combined food and labor view of that same efficiency problem
- Cost of Goods Sold (COGS): Formula, What It Includes, and Why Procurement Controls It — food cost is the restaurant expression of COGS; the same procurement pipeline that controls COGS controls the food cost half of prime cost
- PAR Level in Inventory: Meaning, Formula, and Examples — over-ordering relative to PAR creates perishable spoilage that raises food cost % and, with it, prime cost
- Purchase Price Variance (PPV): Formula, Causes, and Why Procurement Decides It — untracked supplier price increases are the primary cause of food cost % running above theoretical; PPV captures the gap item by item
- Goods Received Note (GRN): Definition, Required Fields, and Why It Closes the Three-Way Match — receiving variances that are not documented in a GRN create phantom food cost — costs in the books that don't reflect what actually arrived
- Restaurant Procurement Software: Recipes, PAR Levels, Supplier Replies, and Food Cost — how the full restaurant procurement workflow — recipe demand, POS signals, supplier ordering, receiving, and food cost visibility — connects in one closed-loop operation
- Best Food Cost Management Software 2026 — software options for restaurant operators managing food cost %, recipe costing, and the procurement loop that drives both