Kitchen yield terms explained: as-purchased weight, edible portion, trim loss and the yield test
A recipe costed on as-purchased weight is always too low. Learn to run a kitchen yield test, calculate edible portion cost, and correct order quantities with measured data.
Contents
Key takeaways
- A recipe costed on the weight that arrives at the back door divides the price of the whole item by the portions made from part of it, so the plate cost is always too low.
- As-purchased weight is what you pay for, edible portion is what you sell, and trim loss is the gap between them, weighed rather than estimated.
- A kitchen yield test is a scale, a knife, the trim spec the line actually uses, and a sheet that records who trimmed and who checked.
- Yield is not a fixed property of an item: it moves with supplier, grade, size band, season and the hand doing the trimming.
- The yield figure has three homes, in this order: the test sheet, the recipe card, and the purchase order.
Yield is the edible portion a kitchen gets from an item as purchased, shown as a percentage of the weight that arrived. As-purchased weight is what the invoice charges for, edible portion is what reaches the plate, and trim loss is the difference. A kitchen yield test measures all three with a scale, and hotel kitchens that skip it cost their recipes on weight they never serve.
The invoice says ten kilos of fish arrived. The plates got six and a half. Nobody wrote down the difference, and the menu price was set on the ten. After reading this article you will be able to run a yield test on any item in your kitchen, correct the recipe cost with one division, and set the order quantity from a measured figure instead of last month's invoice.
Why does a recipe cost go wrong when it starts from as-purchased weight?
Because the invoice weight includes bone, skin, peel and trim that never reach a plate. A cost built on that weight divides the price of the whole item by the portions made from only part of it.
As-purchased weight is what the supplier charges for and what the receiving record shows. Edible portion is what is left after trimming, and it is what the recipe actually consumes. The correction is one division: cost per edible kilo equals the price per as-purchased kilo divided by the yield. Any yield below 100 percent raises the true cost of that ingredient.
The error is silent. The recipe card looks complete, the plate looks right, and the margin is short by exactly the trim. It also compounds per cover: a dish that sells two hundred times a week carries the same understatement two hundred times, so the busiest items hide the largest total error.
Estimating the loss does not fix it. A guess produces a number nobody can defend when the chef and the cost controller disagree. Before measuring anything, separate three different losses: trim removed before cooking, weight lost during cooking, and portioning loss from over-scooping or off-cut slices. Each one has a different fix, and this article covers them in turn, building on standard recipes and portion cost in hotel kitchens.
What do as-purchased weight, edible portion, trim loss and yield mean?
They are four views of the same item: what you buy, what you can sell, what you lose between them, and the ratio of the last two.
| Term | What it means | Unit | Where it is recorded |
|---|---|---|---|
| As-purchased weight (AP) | Weight of the item as delivered | Kilos or grams | Receiving record |
| Edible portion (EP) | Usable weight after trimming | Kilos or grams | Recipe card |
| Trim loss | AP minus EP | Kilos or % of AP | Yield test sheet |
| Yield | EP divided by AP, times 100 | Percent | Test sheet and purchase spec |
| Cooking loss | Weight lost in cooking | % of raw EP | Portion test |
| Portion size | EP weight per guest | Grams | Recipe card |
Trim loss is AP minus EP. Give it in weight and as a percentage of AP, and say which one you mean, because the two are read differently on the line. Yield is EP divided by AP, multiplied by one hundred. Portion size is the EP weight per guest, and it is the bridge between a yield figure and a recipe cost.
Use one vocabulary across the kitchen. If the test sheet says yield, the recipe card must mean the same measurement, not a nearby one.
Trim yield and cooked yield are not the same number
Trim yield is measured before cooking and tells you how much raw material you must buy. Cooked yield is measured after cooking and tells you how much a raw portion becomes on the plate. Cooking loss changes the portion the guest receives, not the quantity you order. Always state which of the two a figure refers to, because a single unlabelled percentage cannot answer either question.
How do you run a yield test?
Weigh the item as it arrives, trim it the way the kitchen trims it for service, weigh the usable part, and divide. The discipline sits in the recording, not in the arithmetic.
Test the item in the state you buy it. A fish tested thawed gives a different figure from the same fish tested frozen, and only one of them matches your invoices. Trim to the spec the line uses in service, not a demonstration trim: a test trimmed more neatly than the kitchen trims produces a yield the kitchen cannot repeat.
Weigh the trim rather than subtracting by eye. The trim weight is the check on the edible weight, because AP must equal EP plus every trim category. Record the by-product too: bones, frames and peel that go to stock have a value, so note where they went and the yield figure stays honest. Run the test on a normal shift, since a quiet morning with the chef doing the cutting measures the chef, not the kitchen. Repeat on a second delivery before you trust the number: one test is a data point, two tests on different deliveries give you a range.
ChecklistBefore starting, gather the following, and make sure the delivered weight itself was checked against the invoice on the food receiving form that records weight and rejected goods
- A scale reading in grams, checked against a known weight
- The item from the usual supplier and grade, in its delivered state
- The knife and trim spec used on the line
- A weighed container for each trim category
- A sheet with date, item, supplier, invoice number, AP weight, trim weights, EP weight, yield, who trimmed, who checked
- A second person to reweigh the first test of any high-cost item
- A named place to write the result, on the recipe card and the purchase spec
How does a yield test work for meat and fish?
The same way, with more cuts: separate bone, skin, fat, sinew and off-cuts, weigh each one, and decide which of them the kitchen actually uses.
Define edible before you cut. A bone-in chop for the grill has a different edible portion from the same chop diced for a stew, and both are correct for their dish. Weigh bone, fat cap, sinew and silverskin separately; their sum plus the edible weight must equal the as-purchased weight, or something went unweighed.
For fish, weigh head, frame, skin, fins and belly trim. Whole-fish yields differ sharply between round and flat fish and across size bands, so the size band belongs on the sheet. Portioning loss is real too: cutting a loin into steaks produces off-cuts, so record them as usable, for staff meal or mince, or as loss, and apply the same rule every time.
Test cooking loss separately: weigh a portion raw, cook it the way service cooks it, weigh it again. That figure sets the plate, not the order. Write the specification next to the yield, meaning grade, size band, trim level and supplier, because a yield without its specification cannot be compared with anything. Never carry a yield from one supplier or grade to another; treat any borrowed figure as a hypothesis until your own scale confirms it.
How do you handle vegetables and fruit, where the loss is peel and season?
Test by purchase unit and by season, because the same crate gives different yields in different months and after different storage.
Weigh a sample of pieces from the crate, not one piece. Small items vary piece to piece, and a single potato is not a purchase unit. Separate peel, core, seed and damaged product: damaged product is a receiving issue, not a yield issue, and belongs on the receiving form with the delivery.
Test in the prep form the recipe uses, because peeled and diced is a different figure from peeled and whole. Season moves the number: yields shift with the growing season and with time in storage, so a figure from one month is not the figure for the year. For high-volume items such as potatoes, onions, tomatoes and leafy greens, test once per season and again after any supplier change. Note the usable by-product, since vegetable trim going to stock changes the effective cost of the dish even though the yield percentage stays the same. Do not average across items: a vegetable yield table is a set of measured rows, one per item and prep form, never a single kitchen-wide number.
How does yield change the recipe cost and the order quantity?
It raises the cost per edible kilo and, by the same ratio, raises the quantity you must buy for a given number of portions. One ratio, read in two directions.
Cost per edible kilo equals the as-purchased price divided by the yield, and this is the number that belongs on the recipe card. Purchase quantity equals the edible quantity needed divided by the yield, which is the same calculation read backwards for the order. Do the cost first and the order second, so the buyer is ordering against a measured requirement rather than last month's invoice. Add a buffer for the variance between tests, not a general guess: if two tests gave a range, order to the lower end of it.
Check the delivered weight and count at receiving, because a short delivery is a receiving claim, not a yield problem, and mixing the two hides both. Recalculate when the supplier, grade or trim spec changes, even if the price has not moved, because the yield is what changed. This sits inside the wider discipline of food and beverage cost control in hotels.
NoteWorked example, for illustration only
For example, an item bought at 40 per as-purchased kilo with a measured yield of 65 percent costs 40 divided by 0.65, about 61.5, per edible kilo. If a banquet needs 13 kilos of edible portion, the kitchen must buy 13 divided by 0.65, which is 20 kilos as purchased. These are illustrative round figures, not market data; your own test on your own delivery supplies the real ones.
What goes on the yield test sheet, who signs it and when is it repeated?
One sheet per item per test, filled by the person who trimmed and checked by the person who owns the cost, repeated on a fixed calendar and on any change of supplier, grade or specification.
The header carries item, supplier, grade or size band, invoice number and date, who trimmed, who checked. The body carries as-purchased weight, each trim category weighed separately, edible weight, yield percentage, and where the trim went. The footer carries the yield figure moved to the recipe card and the purchase spec, with the date it takes effect, so the change is traceable.
Two signatures matter. One is a note; two make it a record that survives a change of chef or cost controller. Repeat once per season per item, on any supplier or grade change, on a new trimmer, and whenever cost per portion moves without a price change. Keep the sheets in date order, because a folder of tests is the only way to see whether a yield is drifting before the margin shows it. Start with the items that carry the most spend, and file the results alongside the discipline of running a hotel storeroom with receipts and issues, so the measured figure follows the item into stock.
What to do next
Pick the five items that carry the most spend in your kitchen and run one yield test on each this week, with the scale and the trim spec the line already uses. Write the measured figure on the recipe card and the purchase spec the same day. The terms only become useful in that order: measure the item, correct the plate cost, then correct the order quantity, and the recipe stops being a document that was right on the day it was written.
Frequently asked questions
What is a normal yield percentage for beef tenderloin or sea bass?
There is no figure that can honestly be quoted for your kitchen, and any published number should be treated as a hypothesis. Yield depends on grade, size band, the trim level you buy, the supplier's cutting and the hand doing the trimming. Confirm any borrowed figure with your own scale on your own deliveries before it touches a recipe card.
Do I still need a yield test if I buy pre-portioned or pre-trimmed items?
Yes, but the test changes shape. Instead of trimming, you verify the specification: count the pieces, weigh a sample, check that the weight per piece matches what you are paying for, and record the result against the invoice. Pre-portioned items can still arrive short in count or light in weight, and that is a receiving claim you can only make with a record.
Does cooking loss count as trim loss?
No. Trim loss is weight removed before cooking and it changes how much you must buy. Cooking loss is water and fat lost in the pan or oven and it changes the portion that reaches the plate. Measure them as two separate tests, because a single combined number cannot tell you whether to change the order or change the plate.
How often should a kitchen yield test be repeated?
Once per season per item as a baseline, and again on any change of supplier, grade, size band or trim specification. Add a test when a new person takes over the trimming, and when the cost per portion moves without a price change. Keep the dated sheets so drift shows up as a trend rather than a surprise.
Who should sign the yield test sheet?
The person who did the trimming and a second person who owns the cost, usually the cost controller or the F&B manager. The first signature says the work was done this way; the second says the number was checked and accepted. On the first test of a high-cost item, have the second person reweigh rather than simply read the sheet.