Prime Cost & Labor Margin Estimator: The Back-of-House Numbers That Actually Matter

Most independent restaurants do not go out of business because the food tastes bad. They go under because the operator never learned how to watch their Prime Cost in real time.

Theoretical recipe costing on a spreadsheet means nothing if line waste, over-portioning, and unmanaged floor labor are quietly bleeding the house dry every shift.

What Is Prime Cost?

Prime Cost is the sum of two numbers: Total Cost of Goods Sold (Food & Beverage) plus Total Labor (Hourly, Salaried, Taxes, and Benefits).

These are the only two major line items in a restaurant that management has direct, day-to-day control over. You cannot negotiate your building rent on a slow Tuesday night, but you can cut labor when tickets slow down, and you can enforce tight prep pars and butcher yields to stop food waste at the cutting board.

The Real-World Benchmarks

• Under 60% (Healthy Margin): Your kitchen operations, purchasing, and shift scheduling are aligned. The house retains enough cash flow to cover occupancy, utilities, maintenance, and actual net profit.
• 60% to 65% (Caution / Tight): Common during seasonal transitions or shoulder weeks. It signals that overtime, over-prepping, or slight ticket drag is eating away at the bottom line. Immediate adjustments are needed before the end-of-month P&L.
• Over 65% (Critical Bleed): An operational emergency. A restaurant operating consistently above 65% prime cost is almost certainly operating at a net loss once fixed overhead hits the ledger.

Use the interactive estimator below to calculate your current weekly numbers and see exactly where your operation stands: