Prime Cost Formula for Restaurants - Complete Guide

A healthy prime cost depends on your restaurant type. Quick-service restaurants target 55-60%, casual dining 58-65%, and fine dining 60-70%. Multi-location groups often run 58-62% owing to scale purchasing and labour standardisation. Single-location operators in the same concept category usually run 2-4% higher. The key is consistency within your concept - sudden spikes indicate cost drift rather than structural issues.

Food cost represents only half the equation. A restaurant with 30% food cost but 35% labour cost has a healthy 65% prime cost. Cut labour cost without improving food cost (through understaffing) and waste increases, offsetting savings. Cut food cost without matching labour improvements and quality suffers, driving customers away. Prime cost forces operators to optimise both simultaneously, protecting both profitability and service quality.

Labour cost percentage is straightforward: (Total Labour Cost / Total Revenue) x 100. For example, if your revenue is £100,000 and total labour cost (wages, taxes, benefits) is £30,000, your labour cost is 30%. Include all employee costs - hourly wages, salaries, payroll taxes, benefits, and any bonuses or commissions. Some operators track this by shift, by department (kitchen vs front of house), or by location to identify where labour is trending high.

Both. Group-level prime cost shows overall health, but location-level tracking reveals where cost drift is happening. A group averaging 60% might include one site at 55% and another at 65%. Without location-level visibility, you miss site-specific issues - a supplier overpaying problem, understaffing, or operational inconsistency. Start with monthly group-level reporting, then layer in weekly location-level analysis to identify and fix problems before they compound.

COGS (Cost of Goods Sold) is food cost only - the cost of ingredients in dishes sold. Prime cost adds labour cost to the equation. COGS tells you how much food costs to deliver a meal; prime cost tells you the total cost of labour and food to generate that revenue. For a restaurant, prime cost is the more strategic metric because it covers the two largest controllable costs. COGS matters for menu engineering; prime cost matters for overall profitability.

Recalculate at least weekly - ideally daily if your systems allow it. Monthly reporting is too late; cost drift compounds before you see it. Weekly reviews let you catch supplier price changes, scheduling anomalies, and waste spikes early enough to respond. Real-time systems (integrated procurement, POS, and scheduling) let you see prime cost daily and adjust in-week. The faster you detect drift, the faster you can fix it.