What a yield test measures and why it decides your food cost
A yield test measures how much of what you buy actually reaches a plate. You weigh the product as it arrives, break it down the way your kitchen normally does, weigh what is left, and divide. That ratio — edible portion over as-purchased — is the yield percentage, and it is the hinge between the price on the invoice and the cost of the food you serve.
The reason it matters is that suppliers price as-purchased weight and menus consume edible weight. If a case of broccoli yields 62% florets, you did not pay $1.40 a pound for broccoli; you paid $1.40 a pound for a product that costs $2.26 a usable pound. The true cost is 61% above the invoice price, so a costing sheet built on the invoice carries only 62 cents of every dollar that item really costs — and the error is invisible because the arithmetic on the sheet is all correct.
Yield also fixes ordering. A production plan that needs 40 lb of trimmed carrots does not need a 40 lb order. At 76% yield it needs 52.6 lb, and the difference is not a rounding allowance — it is the entire reason the prep list ran short last Saturday.
The test is cheap to run. It costs one scale, one existing delivery, and the discipline to write two numbers down. One test on your top ten ingredients will change more about your margins than a supplier renegotiation.
The formula and its three uses
The core calculation is one division:
Yield % = EP weight ÷ AP weight × 100
Trim loss is its complement: 100% − yield, or in weight, AP − EP. Nothing else in the test is more complicated than that. The value comes from the three places you then use the number.
Ordering. AP to order = EP required ÷ yield. Dividing by a fraction raises the number, which is the direction that keeps you from running out. At 76% yield you buy 1.32 times what you need; at 45% you buy 2.22 times. The multiplier is 1 ÷ yield, and it climbs steeply as yield falls.
Costing. EP cost = AP cost ÷ yield, the same division applied to money instead of weight, because you paid for the trim as well as the flesh. This is the number that belongs on a recipe sheet; the edible portion cost calculator takes it further by adding cooking loss on top.
Purchasing decisions. Yield is how you compare a whole product against a pre-fabricated one honestly. Whole tenderloin at $18.00/lb with a 70% yield costs $25.71 per usable pound. Trimmed centre-cut at $24.50/lb with a 100% yield costs $24.50. The convenience product is cheaper here — and you only know that because you ran the test. Labour and by-product value then decide the rest.
That last point deserves care: trim is not always waste. Bones make stock, salmon collars sell, beef fat renders. If a by-product has genuine value in your kitchen, weigh it separately and treat its value as a credit against the trim, rather than inflating the edible portion weight with something you will not serve as the main item.
Worked example: a 20 lb case of whole carrots
A 20 lb case of loose carrots arrives at $0.92/lb. You wash, top, tail and peel the whole case, then weigh the peeled carrots: 15.2 lb. The prep list calls for 40 lb of peeled carrots this week, and you portion them at 4 oz per cover.
- Yield percentage. 15.2 ÷ 20 = 0.76, so the yield is 76%.
- Trim loss. 20 − 15.2 = 4.8 lb, which is 100% − 76% = 24% of the case.
- What the trim cost you. 4.8 lb × $0.92 = $4.42. That money left in the compost bin, and it did so on every case you have ever bought.
- True cost per usable pound. 0.92 ÷ 0.76 = $1.2105/lb. That is 31.6% above the invoice price, and it is the figure your recipe sheet should carry.
- Quantity to order. 40 ÷ 0.76 = 52.63 lb, so three 20 lb cases (60 lb) with a little spare, not two.
- Portions in the tested case. 15.2 lb × 16 = 243.2 oz, ÷ 4 oz = 60.8, so 60 whole portions from one case.
Check the last two against each other: 40 lb of edible carrots at 4 oz a portion is 160 portions, and 160 ÷ 60.8 portions per case = 2.63 cases, which is the same 52.6 lb. Two routes, one answer — a useful habit whenever a yield number surprises you.
How to read a yield percentage
There is no universally good yield, because yield is a property of the product and the fabrication, not of your skill alone. What the number tells you is where the risk sits.
Above 90% — near-fully usable. Portion-cut proteins, most dry goods, canned and frozen products. The invoice price is close enough to the true cost that adjusting it changes little.
70% to 90% — ordinary produce and boneless primals. The cost adjustment is real (a 75% yield adds a third to the price) but the ordering multiplier is manageable.
40% to 70% — bone-in cuts, whole fish, leafy vegetables sold with tops. Here the invoice price is genuinely misleading and the ordering multiplier is 1.4 to 2.5 times. Test these first.
Below 40% — whole round fish, artichokes, some shellfish. Buying decisions in this band should be made on cost per usable pound alone, never on the price per pound quoted.
Two comparisons make the number actionable. Compare your yield to the same test run last quarter: a falling yield on an unchanged product is a receiving or knife-skills problem, not a supplier problem. And compare your yield against the pre-fabricated alternative's implied price, which is what turns a test into a purchasing decision.
What each yield percentage does to your order and your cost
| Yield | Trim loss | Order multiplier | Buy this for 25 lb edible | True cost at $4.00/lb AP |
|---|---|---|---|---|
| 100% | 0% | 1.000× | 25.0 lb | $4.00 |
| 90% | 10% | 1.111× | 27.8 lb | $4.44 |
| 85% | 15% | 1.176× | 29.4 lb | $4.71 |
| 80% | 20% | 1.250× | 31.3 lb | $5.00 |
| 75% | 25% | 1.333× | 33.3 lb | $5.33 |
| 70% | 30% | 1.429× | 35.7 lb | $5.71 |
| 60% | 40% | 1.667× | 41.7 lb | $6.67 |
| 50% | 50% | 2.000× | 50.0 lb | $8.00 |
| 40% | 60% | 2.500× | 62.5 lb | $10.00 |
| 30% | 70% | 3.333× | 83.3 lb | $13.33 |
Notice that trim loss and cost premium are not the same number: a 25% trim loss raises the cost by 33%, not 25%, because the loss is measured against the purchase weight and the premium against the smaller usable weight.
Trim loss and cost premium are different percentages
This is the single most common error in yield work. A 20% trim loss does not add 20% to your cost; it adds 25%, because 1 ÷ 0.80 = 1.25. A 50% loss doubles the cost. Whenever you are tempted to multiply the invoice price by (1 + trim loss), divide by the yield instead. The two agree only at zero.
How to run a yield test that is worth trusting
- Test a full case, not a sample. One carrot is not a case, and case-to-case variation is exactly what you are trying to measure.
- Use one scale for both weights. Two scales differing by 2% on a 76% yield reads as a 74% or 78% yield and will send you chasing a problem that does not exist.
- Weigh the product, not the packaging. Waxed boxes, ice glaze on frozen shrimp and brine in a tub are all purchase weight you must decide how to treat — and decide the same way every time.
- Have the person who normally breaks it down do the test. A yield achieved by your best butcher on a slow Tuesday is not the yield you will get on Saturday service.
- Weigh usable by-products separately. Bones for stock and fat for rendering are value, but they are not the edible portion of your main item.
- Repeat seasonally. Produce yields move with the growing season and with the size grading of the pack.
- Write it on the spec sheet, not on a napkin. A yield number nobody can find is a yield test you paid for twice.
Yield, shrink and where each belongs
Kitchens use two different loss numbers and confusing them is expensive. Trim yield is what this calculator measures: raw weight lost to fabrication, before any heat. Cooking loss, or shrink, is weight lost afterwards to evaporation and rendered fat. They multiply rather than add. A product with an 85% trim yield and a 25% cooking loss delivers 0.85 × 0.75 = 63.75% of its purchase weight to the plate, which means a cooked pound costs 1 ÷ 0.6375 = 1.57 times the invoice price.
Once you have both numbers, the rest of the costing chain follows. The edible portion cost calculator turns them into a cost per portion, the recipe cost per serving calculator assembles those into a plate cost and a menu price, and the catering food quantity per person calculator runs the same two factors in reverse to turn a guest count into a purchase order.
Where published yield tables help — references such as The Book of Yields collect measured figures by product and fabrication — treat them as a starting assumption for a product you have never bought, and replace them with your own measurement as soon as you have one. Your supplier, your specification and your knife skills are all in your number and none of them are in theirs.