Food costs
How to Cost a Sub-Recipe: Sauces, Stocks and Batch Items
Cost a batch item once, divide by its usable yield, and use that cost per unit in every dish that contains it.
By ChefMind AI Team · · 5 min read
House sauces, stocks, dressings and doughs show up in many dishes. If you cost them inside each dish you will do the same arithmetic over and over, and get it wrong when a price changes. Cost the batch once, work out the cost per unit, and use that figure everywhere.
All figures are illustrative examples.
The method
- List every ingredient in the batch at its usable cost. See as-purchased vs edible portion cost.
- Add them up for the batch cost.
- Measure the usable yield. Weigh or measure what you actually end up with after cooking, reducing and straining, not the volume you started with.
- Divide. Cost per unit = batch cost ÷ usable yield.
- Use that cost per unit as an ingredient in each dish.
A worked example: house marinara
| Ingredient | Cost |
|---|---|
| Canned tomatoes | $14.40 |
| Onions | $1.20 |
| Garlic | $0.90 |
| Olive oil | $2.40 |
| Herbs | $1.50 |
| Salt and seasoning | $0.60 |
| Batch cost | $21.00 |
The batch reduces to 6.0 litres of usable sauce.
$21.00 ÷ 6.0 L = $3.50 per litre
A 120 ml portion costs 0.12 x $3.50 = $0.42. A pasta dish with 180 ml of sauce carries $0.63 of sauce cost.
Change the tomato price and you update one number, not every dish.
Build in expected waste
Some of every batch gets spilled, spoils or is trimmed off at the end of the week. If you expect to lose about 5%, your usable yield is smaller than what came off the stove:
6.0 L less 5% = 5.7 L
$21.00 ÷ 5.7 L = $3.68 per litre
A small difference per portion, but a more honest one. Base the percentage on what your waste log shows, not a guess. See how to reduce food waste.
Common mistakes
- Dividing by the starting volume. Stocks and sauces reduce.
- Using list prices, not usable cost. Trim on the vegetables counts.
- Assuming one batch size. If you make half batches, check the yield.
- Forgetting to update. A sub-recipe cost that never changes becomes wrong quietly.
- Double counting. If the sauce already includes the garlic, do not add garlic to the dish again.
- Mixing units. Keep the cost per litre, per kilo or per portion consistent.
Keep it standard
A sub-recipe cost is only reliable if the batch is made the same way each time. Write the method and yield on a recipe card. See standardized recipes and portion control.
Once your sub-recipes have a cost per unit, your dish costing and food cost percentage become much faster to update.
Where software can help
ChefMind AI's recipe costing uses the ingredient costs in your inventory to show a food cost percentage for each recipe. Check that whatever tool you use handles batch yield, and test it on one sauce first.
The short version
- Cost the batch once and divide by usable yield.
- Use the cost per unit in each dish.
- Allow for expected waste and update when prices change.
Frequently asked questions
What is a sub-recipe?
A recipe made in batches and used as an ingredient in other dishes, such as a house sauce, stock, vinaigrette, dough or spice mix.
Should I include labor in sub-recipe cost?
Ingredient cost is the standard starting point. Labor and fuel are real costs, so decide whether you will track them, then be consistent.
How often should I update sub-recipe costs?
Whenever a main ingredient price changes meaningfully, and whenever the batch size or method changes.
Keep reading
Food costs
As-Purchased vs Edible Portion Cost: Costing With Trim and Yield
The price on the invoice is not the cost of the food on the plate. Trim and cooking loss mean the usable portion costs more per kilo than you paid.
For chefs
Standardized Recipes and Portion Control in a Restaurant
A standardized recipe means the same dish at the same cost whoever is cooking. Recipe cards, portion tools and regular plate checks make it real.
Food costs
How to Calculate Food Cost Percentage for a Restaurant
Food cost percentage is food used divided by food sales. Here is how to work it out for the whole restaurant and for a single plate, with numbers you can follow.
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