How to Calculate Restaurant Profit Margin After Food and Labor Costs

Prime Cost Is the Number That Predicts Survival

Prime cost, not net profit, is the leading indicator of restaurant financial health. Prime cost equals total food and beverage cost plus total labor cost, including wages, salaries, payroll taxes, and benefits. Divide that sum by total revenue to get your prime cost percentage.

The formula: (Food Cost + Total Labor Cost) / Total Revenue = Prime Cost %

Industry data from the National Restaurant Association places a sustainable prime cost percentage at or below 60% of revenue for full-service restaurants. Fast-casual and quick-service formats can sustain 55% or lower because of leaner front-of-house staffing.

A prime cost above 65% signals that your menu pricing, portion sizes, staffing model, or all three need immediate adjustment.

How to Calculate Food Cost Percentage

Your food cost percentage is the share of revenue consumed by ingredients. Calculate it weekly, not monthly. Monthly calculations obscure spoilage spikes, theft, and over-portioning that compound fast.

The formula: (Beginning Inventory + Purchases - Ending Inventory) / Revenue = Food Cost %

Full-service restaurants typically target a food cost percentage between 28% and 35%. Fine dining often runs 30% to 35% because protein-heavy menus carry high ingredient costs. Fast-casual targets 25% to 31%.

Worked Example: Full-Service Restaurant

A 60-seat Italian restaurant reports the following for a single week:

• Beginning inventory: $8,400
• Purchases during the week: $3,200
• Ending inventory: $7,100
• Total food and beverage revenue: $22,500

Food cost = $8,400 + $3,200 - $7,100 = $4,500

Food cost percentage = $4,500 / $22,500 = 20%

That result is actually below the typical range, which may indicate strong portion control or a menu weighted toward pasta and low-cost proteins. It might also indicate undercounting ending inventory. Either way, the operator needs to verify with a physical count, not a POS estimate.

How to Calculate Labor Cost Percentage

Labor cost percentage captures every dollar spent on human resources as a share of revenue. Include hourly wages, salaried pay, payroll taxes (employer-side FICA at 7.65%), workers' compensation premiums, health insurance contributions, and any paid time off.

The formula: Total Labor Cost / Total Revenue = Labor Cost %

A combined front-of-house and back-of-house labor target for full-service restaurants sits between 28% and 35% of revenue.

Worked Example: Fast-Casual Concept

A fast-casual burger restaurant with $68,000 in monthly revenue reports:

• Hourly wages (kitchen and counter): $12,400
• Manager salary (prorated monthly): $4,200
• Employer FICA (7.65% on $16,600): $1,270
• Workers' comp premium: $310
• Health insurance contributions: $420

Total labor cost = $12,400 + $4,200 + $1,270 + $310 + $420 = $18,600

Labor cost percentage = $18,600 / $68,000 = 27.4%

That lands inside the healthy range. Combined with a food cost of, say, $17,340 (25.5% of revenue), the prime cost reaches $35,940, or 52.9% of revenue. That gives ownership meaningful room to absorb fixed overhead and still generate net profit.

Gross Profit Margin vs. Net Profit Margin

Gross profit margin strips out only cost of goods sold (food and beverage cost). Net profit margin strips out every cost, including labor, rent, utilities, insurance, marketing, equipment depreciation, and debt service.

Gross profit margin formula: (Revenue - Food Cost) / Revenue

Net profit margin formula: (Revenue - All Operating Costs) / Revenue

A restaurant can post a 72% gross margin and a 2% net margin simultaneously. Both numbers are technically accurate. Only net margin tells you whether the business is worth running.

Calculating Net Profit Margin: The Full Stack

Net margin requires a complete operating cost picture. The following categories are the standard line items below prime cost:

• Occupancy: rent, CAM charges, property taxes. Industry benchmark: 5% to 10% of revenue.
• Utilities: gas, electric, water. Benchmark: 3% to 5%.
• Marketing and advertising: 1% to 3%.
• Repairs and maintenance: 1% to 2%.
• Smallwares and supplies: 0.5% to 1%.
• Insurance: 0.75% to 2%.
• Credit card processing fees: 2% to 3.5%.
• Depreciation and amortization: varies by capital investment.

Worked Example: Net Margin Calculation

Using the fast-casual example above ($68,000 monthly revenue, $35,940 prime cost):

• Rent: $5,200
• Utilities: $2,100
• Marketing: $900
• Repairs and supplies: $800
• Insurance: $600
• Credit card fees (2.8% of $68,000): $1,904
• Depreciation: $750

Total non-prime operating costs: $12,254

Total all-in costs: $35,940 + $12,254 = $48,194

Net operating profit: $68,000 - $48,194 = $19,806

Net profit margin: $19,806 / $68,000 = 29.1%

That result is exceptional by industry standards and reflects a well-controlled fast-casual model. Most full-service operators with higher labor ratios and larger footprints land between 4% and 9%.

Why Owners Misread Their Own Margins

Three calculation errors distort restaurant margins more than any other factor.

First, operators exclude owner draws from labor cost. If you work in the restaurant and pay yourself a draw instead of a salary, that draw belongs in labor cost for the purposes of calculating true prime cost.

Second, operators calculate food cost on revenue including sales tax. Sales tax is not revenue. Remove it from the denominator before calculating any cost percentage.

Third, operators use net sales instead of gross sales without adjusting for comps, voids, and employee meals. Each of those reduces effective revenue. Account for them explicitly or your food cost percentage will appear lower than it actually is.

Use the CalcMoney Calculator to Check Your Self-Employment Tax Exposure

Restaurant net profit flows directly to your Schedule C if you operate as a sole proprietor or single-member LLC. On $19,806 in monthly net profit, the annual equivalent of $237,672 carries a self-employment tax liability of approximately $22,667 (15.3% on the first $168,600 for 2024, 2.9% on the remainder), before the 50% SE tax deduction reduces your adjusted gross income.

That tax hit changes your true take-home margin. A 29% operating margin does not equal a 29% personal margin after SE tax and federal income tax.

The CalcMoney self-employment tax calculator takes your net profit figure and produces an estimated SE tax liability, deductible amount, and effective after-tax margin in seconds. Run your numbers before your next pricing review.

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Results are estimates for informational purposes only. Consult a licensed financial professional before making financial decisions.