What recipe yield is and how to measure it

Recipe yield is how many sellable units, or how many sellable kilos, one batch gives you. You measure it by counting or weighing what is ready to sell at the end, not by adding up the ingredients or trusting the recipe. Measure three batches in a row, use the average, and divide the batch cost by that number: that gives you your real cost per unit.

Theoretical yield and real yield

Theoretical yield is what the recipe promises, or what you get by doing the maths: a tray the recipe says to cut into 24 squares gives 24 brownies.

Real yield is what you count at the end of the day. It is almost always lower, for small reasons that add up: dry edges you trim off, a square that cracks when you lift it, a corner you eat to check the bake, batter left in the bowl.

For costing, only the real one matters. Your cost per unit is the batch cost divided by the units you sell. Divide by 24 when you sell 21 and every brownie costs more than you think. The guide on how to calculate the cost per unit of a recipe shows that division with the full batch cost, not just ingredients.

How to measure it, step by step

1. Make the batch the way you always do. No special care: you want the number from a normal day.
2. Wait until it is finished. Cooked, cooled, cut and ready to sell. Weigh a loaf after baking, not the raw dough.
3. Count or weigh only what is sellable. Broken, burnt and tasted pieces stay out.
4. Write it down with the date. In a notebook or on your phone, along with anything unusual (new supplier, a hot day, someone else made it).
5. Repeat over three batches. Add the three results and divide by three.
6. Work out your yield percentage. Real yield ÷ theoretical yield × 100. It helps you spot a batch that went worse than usual.

If the three batches are very different, use the lowest until you find the cause. Costing slightly high is better than finding out at the end of the month that you made less.

Units or weight

It depends on how you sell:

• If you sell by the piece (brownies, cookies, slices, meal prep boxes), count units.
• If you sell by weight or volume (jam, hot sauce, granola, soup), weigh or measure the finished product and divide by your jar or bag size.

Products that cook down can end up weighing far less than the ingredients that went in, because water evaporates. Products that absorb water, like rice or oats soaked overnight, can weigh more. That is why you cannot calculate yield. You have to weigh it.

What lowers yield

• Portions bigger than the recipe's. Ten extra grams on each of 24 cookies meant to weigh 40 g is 240 g: six cookies that never exist.
• What stays in the bowl, pan or blender. A silicone spatula recovers more than you would expect.
• Pieces that break or come out ugly. If you do not sell them, they do not count.
• Tasting. It is necessary, and it costs: include it in the measurement instead of ignoring it.
• Edges and offcuts. Trimming a tray bake so the squares look even.

Keep two other things separate. Loss when you prep each ingredient (peel, stems, bones) is handled ingredient by ingredient, with its own percentage, as explained in yield percentage: as purchased vs edible portion. Losses after production, such as unsold or expired stock, are measured on their own, as in how to measure and cost food waste. Recipe yield sits between the two: what comes out of the batch, ready to sell.

Worked example: brownies

You bake brownies in a single tray. The recipe says to cut it into 24 squares.

Batch cost: $16.80, covering chocolate, butter, sugar, eggs, flour, baking paper, oven energy and your time.

What you measured over three bake days:

Why 21 and not 24: you trim the dry edges so the squares look clean, which costs you most of a row, and one or two squares crack when you lift them out.

Yield percentage: 21 ÷ 24 = 87.5%.

Cost per brownie:

• Using the recipe's yield: 16.80 ÷ 24 = $0.70
• Using your real yield: 16.80 ÷ 21 = $0.80

The difference: $0.10 per brownie. At 300 brownies a month, that is 300 × 0.10 = $30 a month your numbers were not showing. If you sell each one for $2.50, you thought your margin was (2.50 − 0.70) ÷ 2.50 = 72%. The real one is (2.50 − 0.80) ÷ 2.50 = 68%.

What to do with that number: cost with 21 from today. Then decide what to do about the edges. If you bag the offcuts and sell them cheaply, or use them in another product, they stop being a loss. If you would rather keep every square, line the tray well and bake a few minutes less so you do not need to trim. Either way, measure again after the change.

When to measure again

Measure again when:

• You change supplier or the quality of a main ingredient.
• You change equipment: oven, tray, mould, blender.
• Someone else starts making the product.
• You change the portion or the jar size.
• The same shopping covers fewer orders than you expected.

Once your yield is stable, checking one batch every so often is enough. What matters is that the number you cost with is one you measured, not one you assumed. The guide to recipe costing shows how yield fits together with waste, portions and scaling.

Do it with the calculator

In the food cost calculator, enter your batch ingredients and the real yield you measured in "Units per batch"; it gives you the cost per unit and the price you need for the margin you want.