What Is Yield Percentage?

You pay for the whole case, but you can only serve part of it. Yield percentage tells you how much of what you buy actually makes it onto a plate.

Here's what you'll learn:

• What yield percentage is
• How to calculate it
• How yield changes your true cost
• How to run a simple yield test

What Is Yield Percentage?

Yield percentage is the share of a product that is still usable after trimming, peeling, deboning, or cooking. The rest is trim, bones, skin, cores, or moisture lost in cooking.

Two terms come up alongside it:

• As purchased (AP) is the product as it arrives from your supplier, at full weight.
• Edible portion (EP) is what is left once the product is ready to use.

Yield percentage connects the two.

How to Calculate Yield Percentage

Yield % = Usable Weight ÷ Purchased Weight × 100

Example: a 10 lb case of whole romaine gives you 7.5 lb of usable leaves after trimming. The yield is 75% (7.5 ÷ 10 × 100).

Weigh both numbers in the same unit. Mixing pounds and ounces is the fastest way to get a yield that makes no sense.

How Yield Changes Your True Cost

Your real cost per usable unit is always higher than the price on the invoice. Yield tells you how much higher.

Usable Cost = Purchase Cost per Unit ÷ Yield %

Example: that 10 lb case of romaine costs $20, or $2.00 per pound as purchased. At a 75% yield, the usable cost is about $2.67 per pound ($2.00 ÷ 0.75).

If you cost a recipe at $2.00 per pound, every dish using it looks cheaper than it really is. Across a full menu, that gap can explain a food cost that never quite lines up.

How to Run a Yield Test

A yield test is a quick, repeatable way to find the real yield for an item in your kitchen. Run it the same way every time.

1. Weigh the product as received. Record the full purchased weight.
2. Prep it the way your kitchen normally does. Use your usual cuts and your usual staff, not your most careful cook on a slow day.
3. Weigh the usable product. This is your edible portion.
4. Weigh the trim separately. It helps confirm your numbers add up and shows whether trim could be used elsewhere.
5. Repeat a few times and average the results. One test can be thrown off by a single unusual case.

Which Items Need a Yield Test?

You don't need to test everything. Focus where yield has the biggest effect on cost.

• Whole proteins, such as bone-in cuts, whole fish, and whole poultry
• Produce with heavy trim, like leafy greens, melons, pineapple, and herbs
• Anything that loses weight in cooking, such as roasted meats and reduced sauces
• Your highest-cost items, where a few points of yield add up to real money

Shelf-stable items that are used as-is, like canned goods or bottled sauces, are close to 100% and rarely need testing.

What Lowers Your Yield

If an item's yield drops below its usual number, look for one of these:

• Inconsistent trimming between staff or shifts
• Over-trimming to save time or make product look perfect
• Poor storage that leads to wilting, drying out, or spoilage before use
• Supplier quality changes, like smaller heads, more fat, or more damage on arrival

Retest when you change suppliers or notice an item's cost creeping up without a price increase.

Key Takeaways

• Yield percentage is the share of a product that is usable after prep or cooking.
• Formula: Usable Weight ÷ Purchased Weight × 100.
• Divide the purchase cost by the yield to get your true cost per usable unit.
• Run yield tests on whole proteins, heavy-trim produce, and high-cost items.
• Inconsistent trimming, poor storage, and supplier changes all lower yield.

Once you know your real yields, the next step is building them into your recipe costs so your menu prices reflect what each dish actually costs to make.