The food cost formula is (Beginning Inventory + Purchases − Ending Inventory) ÷ Food Sales × 100. The numerator is cost of goods sold: what you consumed in the period, not what you purchased. Most full-service restaurants land between 28% and 32%, and every point of food cost is real money on the P&L.
The Food Cost Formula (And What Your Percentage Should Actually Be)
Most operators can quote their food cost percentage. Far fewer can explain why it moved three points last quarter, and that gap is where margin disappears. Here is the formula, the version of it that actually holds up in a real kitchen, and the benchmarks worth measuring yourself against.
The basic food cost formula
Food Cost % = (Beginning Inventory + Purchases − Ending Inventory) ÷ Food Sales × 100
The numerator is your cost of goods sold (COGS): what you actually consumed in the period, not what you bought. Buying $40,000 of product in a week when you used $28,000 of it does not mean your food cost spiked; it means you loaded the walk-in.
A worked example
- Beginning inventory: $22,000
- Purchases during the period: $61,000
- Ending inventory: $19,500
- Food sales: $205,000
COGS = 22,000 + 61,000 − 19,500 = $63,500
Food Cost % = 63,500 ÷ 205,000 × 100 = 31.0%
At $205,000 in food sales, every single point of food cost is $2,050. That is the number to keep in your head: a two-point improvement on this P&L is $4,100 a month, or roughly $49,000 a year, with no menu change and no supplier change.
Plate cost vs. period food cost
The formula above tells you what happened. Plate cost tells you why:
Plate Cost = Σ (ingredient cost × portion used)
Ideal Food Cost % = Plate Cost ÷ Menu Price × 100
Run both. When your period food cost is meaningfully higher than your ideal food cost, the difference is waste, over-portioning, theft, or a supplier price you didn't notice changing. That last one is more common than operators expect, because distributor price movement rarely announces itself.
What food cost percentage should you target?
| Segment | Typical range |
|---|---|
| Full-service, casual | 28–32% |
| Fine dining | 30–35% |
| Pizza / high-margin concepts | 20–28% |
| Barbecue & protein-heavy | 32–38% |
| Quick service | 25–30% |
Treat these as orientation, not gospel. A 34% food cost with strong volume and low labor can out-earn a 27% food cost that came from cutting quality. The number that matters is your trend line, and whether the inputs are priced correctly.
The line item the formula hides
The food cost formula measures the result of your purchasing. It says nothing about whether your purchasing is competitive. Two restaurants can run identical recipes, identical portions, identical waste discipline, and still post food costs three points apart because one has a better distributor contract than the other.
That's the part operators can't see from the invoice. Distributor pricing is built from a cost base plus a markup you were never shown, and it drifts. Reading your invoice properly is step one; benchmarking those prices against what comparable operators pay is step two.
Fix the formula's inputs, not just the math
FoodServiceIQ is an outsourced procurement team run by former Sysco and US Foods executives. We renegotiate contracts and monitor pricing continuously, without changing your suppliers or your menu. Clients typically see results in 60–90 days, and our fee is performance-based.
See what that looked like for Black's Barbecue (7.5% food cost reduction), Dish Society, and Thunderdome Restaurant Group ($500K+ annually), or request a free food cost analysis and we'll show you exactly where you're overpaying.
FAQ
What is the food cost formula?
(Beginning Inventory + Purchases − Ending Inventory) ÷ Food Sales × 100. The first part is your cost of goods sold; dividing by sales gives your food cost percentage.
How do I calculate food cost percentage per dish?
Add the cost of every ingredient at the portion you actually serve, then divide by the menu price. A $4.10 plate cost on a $16 entrée is a 25.6% food cost.
What is a good food cost percentage for a restaurant?
Most full-service restaurants target 28–32%. Protein-heavy concepts run higher, high-margin concepts lower. Consistency and trend matter more than hitting a specific number.
How often should I calculate food cost?
Weekly if you can count inventory weekly; monthly at minimum. Quarterly is too slow to catch a supplier price change before it costs you real money.
Why is my food cost rising when my prices haven't changed?
Usually one of four things: portion drift, waste, theft, or distributor price increases you didn't catch. The first three are operational. The fourth is a purchasing problem, and it's the one most operators never audit.
