Prime Cost Tracking: The Most Important Number in Your Restaurant

The restaurant industry operates on razor-thin margins. While the average small business sees net profit margins of 10% to 15%, a successful full-service restaurant typically operates with a net margin between 3% and 9%. With so little room for error, owners cannot afford to wait for monthly financial statements to understand profitability. The single most important metric is Prime Cost.

What is Prime Cost?

Prime Cost = COGS + Total Labour Costs. COGS includes food, beverage, and packaging. Labour includes wages, salaries, payroll taxes, and benefits. These are the two largest expense categories in any restaurant and the only major ones the operator can adjust on a daily basis. You cannot change rent or insurance mid-month, but you can adjust scheduling or purchasing.

The target benchmark

For most full-service restaurants the target Prime Cost is between 58% and 65% of total sales. If Prime Cost exceeds 65%, the restaurant is unlikely to generate a net profit — the remaining 35% will be entirely consumed by fixed overhead.

• Food cost target: typically 28% to 34% of food sales
• Labour cost target: typically 25% to 35% of total sales

Why monthly tracking is inadequate

Most owners get a P&L from their bookkeeper by the 15th of the following month. If food costs spiked in the first week of June, the owner might not realize it until mid-July — six weeks of profits already lost, and the opportunity to correct (e.g., identifying a supplier price increase or portion-control issues) has passed.

Implementing weekly Prime Cost tracking

• Weekly inventory: physical count of high-value items every Sunday night
• Weekly sales reports: pull gross sales from the POS
• Weekly payroll estimates: pull hours worked, allocate payroll taxes

Reviewing Prime Cost every Monday morning lets the owner adjust schedules or purchasing for the current week — proactive instead of reactive.