If you could watch only one number in your restaurant, it should be your restaurant prime cost. It combines the two largest, most controllable costs you carry and, more than any other figure, decides whether a busy month actually leaves money in the bank. This guide explains what it is, how to calculate it, and how to keep it under control.
What is prime cost?
Prime cost is the sum of your cost of goods sold (COGS) and your total labour cost for a period.
- COGS — the food and beverage that went into what you sold: ingredients, provisions and drinks.
- Labour — wages, salaries and staff-related costs for both kitchen and front-of-house.
These are the costs most directly tied to serving each plate, and crucially, the ones you can influence day to day. Rent is largely fixed once you sign the lease; prime cost is where a hands-on owner makes or loses margin.
How to calculate it
The formula is simple:
Prime cost = COGS + Labour cost
To make it comparable across months, express it as a percentage of sales:
Prime cost % = (COGS + Labour) ÷ Sales
Suppose in a month your sales (net of GST) were ₹10,00,000, your COGS was ₹3,20,000 and your labour was ₹2,80,000. Prime cost is ₹6,00,000, or 60% of sales. That means 40 paise of every rupee is left to cover rent, utilities, aggregator commissions and profit.
Why it matters more than food cost alone
Owners often obsess over food cost while labour drifts, or squeeze staff while ingredients quietly bleed. Prime cost forces you to look at both together, because they trade off against each other. A cheaper, pre-portioned ingredient may raise food cost but cut prep labour; a scratch kitchen may lower food cost but demand more hands. Only the combined number tells you whether a decision actually helped.
Practical ways to bring prime cost down
Control the food side
- Track waste and theft. What you buy but do not sell is pure loss. Regular stock counts against your recipes expose the gap.
- Standardise recipes and portions. Consistent portioning stops silent over-serving that erodes margin plate by plate.
- Negotiate and rotate suppliers. Small per-kilo savings compound across a year.
Control the labour side
- Roster to demand. Match staffing to your real hourly footfall, not a flat shift pattern.
- Speed up service. Faster table turns and quicker kitchen output raise sales without adding hours.
- Cross-train staff so a lean team covers peaks without over-hiring.
You cannot improve what you cannot measure
Bringing prime cost down starts with measuring it accurately and often, not once a quarter. That means reliable sales data and a real handle on what you consumed. Accurate sales capture through restaurant POS software gives you a dependable sales figure, while linked inventory and finance reporting turn purchase and stock data into a real COGS number instead of a guess.
- Review prime cost every week or two, not just at month-end.
- Compare it against your own trend to catch drift early.
- For chains, use multi-outlet management to see which branch runs lean and which needs attention.
Watch prime cost closely and the rest of your P&L tends to follow. Ignore it, and no amount of footfall will guarantee a profit.
Frequently asked questions
What is included in restaurant prime cost?
Prime cost is your cost of goods sold plus your total labour cost. COGS covers the food and beverage in what you sold; labour covers wages, salaries and staff-related costs for kitchen and front-of-house.
What is a good prime cost percentage?
Targets vary by format, menu and location, so there is no universal figure. The practical approach is to measure your own prime cost consistently and work to trend it downward over time.
Why is prime cost more useful than food cost alone?
Because food and labour trade off against each other. A change that lowers one can raise the other, so only the combined prime cost shows whether a decision actually improved your margin.
How often should I calculate prime cost?
More often than monthly if you can. Reviewing prime cost weekly or fortnightly lets you catch rising waste or overstaffing while you can still act, rather than after the month has closed.
