The portion cost formula helps kitchens turn a batch recipe into a cost per serving. It is useful for restaurant menus, catering trays, bakery batches, prep sheets, and packaged food items.
The formula is simple, but it only works if total recipe cost and portion yield are accurate.
Portion cost formula
| Formula | Example | Result |
|---|---|---|
| Portion Cost = Total Recipe Cost / Portions | $48 / 16 portions | $3.00 per portion |
Portion cost vs food cost percentage
Portion cost is a dollar amount. Food cost percentage compares that dollar amount with the selling price. You usually need both to make a pricing decision.
| Metric | Formula | Use |
|---|---|---|
| Portion cost | Total recipe cost / portions | Find ingredient cost per serving |
| Food cost % | Portion cost / selling price x 100 | Check pricing target |
| Gross profit | Selling price - portion cost | Check dollars left before labor and overhead |
Using portion cost for catering
For catering, portion cost can be multiplied by guest count to estimate food cost. The quote still needs labor, packaging, delivery, rentals, waste buffer, overhead, and profit.
Portion cost example
A tray of baked pasta costs $72.00 to make and yields 24 portions. The portion cost is $3.00. If it sells for $10.00 per portion, food cost percentage is 30.0%.
| Metric | Calculation | Result |
|---|---|---|
| Portion cost | $72.00 / 24 | $3.00 |
| Food cost % | $3.00 / $10.00 x 100 | 30.0% |
| Gross profit | $10.00 - $3.00 | $7.00 |
Watchouts
Common mistakes
Counting portions too generously compared with what is actually served.
Using recipe cost before yield loss, trim, or waste is included.
Ignoring portion tools, ladles, scoop sizes, or package weights.
Using portion cost alone without checking selling price and gross profit.
Keep reading
Related guides
How to Calculate Cost Per Portion
Learn how to calculate cost per portion from total recipe cost, finished servings, and menu price for restaurants, caterers, and food businesses.
Read guideHow to Calculate Recipe Cost
A practical method for adding ingredient costs, yield, and portion cost before pricing a recipe.
Read guideFood Cost Formula
Understand the food cost formula, food cost percentage equation, gross profit, and how to use food cost math for menu pricing.
Read guideFrequently asked questions
What is portion cost?
Portion cost is the ingredient cost of one finished serving or saleable portion.
What is the formula for portion cost?
Portion Cost = Total Recipe Cost / Number of Portions.
How do you calculate catering portion cost?
Find cost per portion, multiply by guest count, then add buffer, labor, packaging, delivery, and other event costs.
Is portion cost the same as menu price?
No. Portion cost is ingredient cost. Menu price is what the guest pays and should also account for labor, overhead, demand, and profit.