Invoice price is not food cost. Operators who cost recipes from the case label leak margin every week. yield for food is the usable weight you actually plate after receiving loss, fabrication, and cook shrink. Track all three stages or your recipe costing is a guess.

Three-Stage Yield, Not One Butcher Test

Treat yield as a chain. Each stage has a different owner, a different cause of loss, and a different fix. Multiply the three percentages. That stacked number is your true yield from as-purchased (AP) weight.

·         Receiving yield: net usable weight at the back door versus what you paid for.

·         Fabrication yield: trim, bone, fat, and portioning loss in prep.

·         Cook yield: moisture loss, fat render, and overcook on the line or in the oven.

A 98% receiving yield times a 68% fabrication yield times a 78% cook yield is about 52% edible product. That is why a cheap protein can still blow food cost.

Stage 1: Receiving

Start at the scale, not the invoice. Chicken packed on ice, shrimp with glaze, and boxed produce ship with weight that is not edible. If the spec is 40 lb net, weigh it net. Catch short weights the same day you can still credit the distributor.

Receiving loss looks small per case and large over a year. A consistent 2% short on a $4,000 weekly protein spend is more than $4,000 a year before anyone turns on a knife. Train the opener to check temperature, date, ice, and net weight on the top five spend items. Log credits. Do not hide the variance in waste.

Stage 2: Fabrication

This is where most kitchens lose money without noticing. Two cooks breaking down the same case of whole birds will not produce the same usable ounces unless you spec the cut, the trim level, and the portion weight. Write the yield on the prep sheet: AP in, edible portion (EP) out, by person, by day.

Bone-in versus boneless is a cost decision, not a preference. Whole birds are cheaper per pound AP and more expensive per plated ounce if your team cannot fabricate cleanly.

What to test weekly

·         High-cost proteins: chicken, steak, salmon, shrimp.

·         Produce with heavy peel or core: pineapple, avocado, cabbage, citrus.

·         Any item you portion by count but buy by weight.

Spot-check. Do not wait for month-end inventory. If breast trim jumps from 8% to 14%, you have a knife-skill or spec problem this week, not next period.

Stage 3: Cook Loss

Cook yield is the stage operators skip because it feels like "just cooking." Roasts, braises, burgers, and wings all lose water and fat. Overcook a 6-ounce raw burger to well-done and you may serve 4.5 ounces. Guests notice. Food cost notices more.

Hold times kill yield too. Prime rib in a warmer, fried chicken under a lamp, and pasta sitting in a well all dry out. You either 86 the piece or you over-portion to make the plate look right. Both are cook-yield problems dressed up as hospitality.

Worked Example: 40 lb Case of Whole Chicken

You pay $1.89/lb AP for a 40 lb case. Invoice is $75.60. That number is useless until you run the three stages.

Receiving. Ice and purge eat 1.5 lb. Net poultry is 38.5 lb. Receiving yield: 96.3%.

Fabrication. After bone, fat, and unusable trim you have 22.0 lb of usable raw meat. Fabrication yield on net weight: 57.1%. On AP case weight: 55.0%.

Cooking. Roast or fry with 22% moisture and fat loss. Edible plated weight: 17.16 lb. Cook yield: 78% of fabricated meat.

Stacked yield: 17.16 lb edible from 40 lb purchased is 42.9% overall. True edible cost: $75.60 / 17.16 = $4.41 per lb plated, not $1.89. If your recipe still costs chicken at invoice price, you understate food cost by more than double on that item.

Change one stage and the math moves. Lift fabrication to 24.0 lb raw meat at the same cook loss and edible weight becomes 18.72 lb. Edible cost drops to $4.04/lb. That is a prep-training win, not a purchasing win. A sloppy cook who over-fries extra minutes can erase a better vendor bid in one shift.

Re-test yield for food when you change vendors, cut specs, cook methods, or ticket times.

How Yield Shows Up in Prime Cost

Food cost is the first half of prime cost. Labor is the second. Yield sits in between. Poor fabrication looks like a food-cost problem and a labor-skill problem at once. Save $0.20/lb on a cheaper bird and then lose 6 more points of yield, and you did not save. You moved the loss from the invoice to the trim bucket.

Price the menu on edible ounces. Build prep lists on AP weight needed to hit those ounces. When inventory variance spikes, ask which stage moved before you blame theft.

Operator Checklist

·         Weigh the top 10 spend items at receiving. Credit shorts the same day.

·         Post expected fabrication yields on the prep sheet. Initials next to actuals.

·         Test cook yield on the three highest-protein menu items every month.

·         Cost recipes on edible weight. Update when vendor or method changes.

·         Review yield drift in the same meeting where you review food cost and labor.

Yield is not culinary trivia. It is how purchasing, prep, and the line either protect or destroy the cents you thought you made on the bid.