Yield Percentage Calculator
Enter what you bought and what survived trimming to get your true edible-portion cost — the number that belongs in your recipes instead of the invoice price.
Why yield percentage decides your real food cost
There are two weights for almost every ingredient you buy. There is the weight the supplier invoiced you for, and there is the smaller weight that survives peeling, trimming, boning, filleting or draining and actually reaches a guest. You pay for the first one. You sell the second one. Yield percentage is simply the ratio between them, and it is the single most common reason plate costs come out lower on paper than they do in your inventory.
The mistake is not usually laziness. It is that the invoice price is the number sitting in front of you when you build a recipe, and it looks authoritative. Nothing on that invoice tells you that a third of the case is going in the bin before service. So the recipe gets costed at the buy price, the menu gets priced off that recipe, and the gap only appears months later as an unexplained variance between theoretical and actual food cost.
Once you know the yield, correcting the cost is one division. The as-purchased price divided by the yield expressed as a decimal gives you the price of the part you can actually sell.
That edible-portion figure is the one that belongs in every line of your recipe costings. Anything else is a guess dressed up as a spreadsheet.
A worked example, start to finish
A whole striploin is invoiced at $22.00 a kilogram. You take delivery of 8 kg. After removing the fat cap, the sinew and the chain, you are left with 5.8 kg of steak-ready meat. The yield is 5.8 ÷ 8, or 72.5%.
Your edible-portion cost is $22.00 ÷ 0.725, which is $30.34 a kilogram. That is a difference of $8.34 on every kilogram, and it is money you have already spent whether or not your recipe card knows about it.
Now put it on a plate. At a 250 g portion, the correct meat cost of that steak is $7.59. Costed at the invoice price it would read $5.50. You have understated one component of one dish by $2.09.
Sell sixty of those steaks in a week and the error is about $125 a week, or roughly $6,500 a year, from a single line on a single recipe. Multiply that across every trimmed protein and every peeled vegetable on your menu and you have the reason so many operators cannot reconcile a food cost percentage that looks fine in theory with one that never quite behaves in practice.
The same arithmetic runs in reverse when you order. If you need a fixed amount of trimmed product for a function or a prep list, dividing by the yield tells you what to buy.
Needing 12 kg of trimmed steak at 72.5% yield means ordering 16.6 kg, not 12 kg. Getting this wrong is how a kitchen runs short mid-service on the one item it planned most carefully.
Typical yield ranges — as a starting point only
Published yield tables are useful for sanity-checking, and dangerous for costing. Your yield depends on your supplier's specification, your butchery standard, your knife skills and how much of the trim you genuinely reuse. Treat everything below as an opening assumption to be replaced by your own measurement within a fortnight.
| Item | Rough yield range | Effect on cost |
|---|---|---|
| Whole fish, filleted and pin-boned | 40–55% | Buy price roughly doubles by the time it reaches the plate. |
| Beef primal, trimmed and portioned | 65–85% | Large in dollar terms because the unit price is already high. |
| Leaf lettuce, cored and washed | 70–85% | Small per unit, meaningful across volume. |
| Onions and root vegetables, peeled | 80–90% | Minor individually, compounds across a full prep list. |
| Portion-controlled or pre-prepped items | Close to 100% | No correction needed — that is what the premium buys. |
That last row is worth pausing on. Comparing a $22 primal against a $30 pre-portioned steak looks like an obvious win for the primal until you apply yield. At 72.5% the primal costs $30.34 edible, which makes the pre-portioned product cheaper before you have paid anyone to break it down. Yield percentage is what turns a make-or-buy argument into an arithmetic one.
How to run a yield test
A yield test takes about ten minutes per item and needs nothing more than accurate scales and somewhere to write two numbers down.
- Weigh the item as delivered, before anything is removed. Do this at the bench, not from the invoice — delivered weights and invoiced weights are not always the same, and that discrepancy is worth knowing about on its own.
- Break it down exactly as you would in service, by whoever normally does the job. A yield test performed carefully by the head chef describes a shift that never happens.
- Weigh the usable product that will be portioned and sold. Weigh the trim separately if you plan to use any of it.
- Repeat three times on different days and average the result. A single test captures one animal, one crate and one cook, none of which are representative.
- Record the date and the supplier. Yields drift when specifications change, and without a date you will not be able to tell a genuine change from a bad memory.
- Re-test after any supplier or specification change, and at least twice a year regardless. Yields are not permanent facts.
Where trim genuinely gets reused — bones to stock, offcuts to a braise or a staff meal — you have a choice. Either credit the trim at a realistic value, or keep the yield strict and treat the recovered product as a saving elsewhere. Both are defensible. What is not defensible is assuming full reuse in the costing and then watching the trim go into the bin, which quietly restores the original error under a new name. If that is happening, the honest place to record it is your food waste cost, not your yield.
Where the error surfaces in your numbers
Understated yields do not announce themselves. They show up as a persistent gap between the food cost you calculated and the one your inventory reports, and because that gap has several possible causes, most operators chase the wrong one first.
The signature of a yield problem is specific. The variance is stable rather than erratic, it does not respond to tightening portion control, and it is largest on the dishes built around whole or minimally processed proteins. Waste and theft produce lumpy, unpredictable variances. Yield error produces a steady one that never moves no matter how well the week goes.
It also distorts decisions downstream. Menu pricing built on an understated cost sets prices too low, so the target margin is never achieved on the very dishes you priced most deliberately. Menu engineering inherits the same flaw: a dish flattered by an uncorrected yield looks more profitable than a competitor dish that happens to use pre-prepped ingredients, and the analysis recommends promoting the wrong one. Because those recommendations feed back into what you cook and what you push, a yield error compounds rather than averaging out.
Fixing the yields on your ten highest-volume ingredients typically explains most of an unexplained variance in your food cost percentage, and it is the cheapest diagnostic available to you — a set of scales and an afternoon.
Common mistakes
- Applying a published yield table without testing. Useful as a cross-check, unreliable as a cost input. Your butchery is not the table's butchery.
- Testing once and never again. A supplier switch, a specification change or a new cook on the section all move the number, and nothing prompts you to notice.
- Mixing units. Costing a kilogram buy price against a gram portion without converting is the most common arithmetic error in recipe costing, and it produces results wrong by a factor of a thousand rather than a few percent.
- Ignoring cooking loss. Trim yield and cooking yield are different reductions and they stack. If you portion raw and sell cooked, only the trim loss matters for cost; if you portion after cooking, both apply.
- Crediting trim you do not actually use. An optimistic stock credit reintroduces the original understatement.
- Costing the whole recipe at one blended yield. Yields belong on individual ingredients. A single blanket adjustment applied to a whole dish will be wrong on every line of it.
None of this is complicated, which is exactly why it gets skipped. Yield percentage is the least sophisticated idea in restaurant costing and the one most reliably missing from the spreadsheets it should be in.
Frequently asked questions
What is a good yield percentage?
There is no good or bad in the abstract — a whole fish at 45% and a bag of peeled onions at 95% can both be fine. What matters is that the number is measured rather than assumed, and that it is stable over time. A yield that drops without a specification change is the signal worth acting on.
Should I use yield percentage or a yield factor?
They are the same relationship expressed two ways. The percentage tells you how much survives; the factor (as-purchased divided by edible weight) is what you multiply the buy price by. Use whichever your team finds easier to remember, but do not mix them in one spreadsheet.
Does cooking loss count as yield loss?
It is a separate reduction and it depends on when you portion. If you weigh and portion raw, only trim loss affects your cost per plate. If you portion after cooking, you need both the trim yield and the cooking yield, applied in sequence.
How often should I re-test yields?
Whenever the supplier or the product specification changes, and at least twice a year otherwise. Seasonal produce is the main exception — that should be tested at the start of each season, because the difference between early and late season yield on some items is substantial.
What if I use the trim for stock or staff meals?
Either credit the trim at a realistic value in the costing, or keep the yield strict and record the reuse as a saving elsewhere. Pick one and apply it consistently. The failure mode is crediting trim in the spreadsheet that in practice goes in the bin.
Can I skip yields by buying pre-portioned product?
Yes, and sometimes that is the right call. Pre-portioned items yield close to 100%, so the invoice price is the plate price. Compare it against your edible-portion cost rather than your buy price, and include the labour you would spend breaking product down. That comparison goes the way of the pre-portioned product more often than chefs expect.
Why does my food cost percentage look worse than my recipes predict?
Uncosted yield loss is one of the three usual causes, alongside waste and portion drift. Yield error has a distinctive shape: the variance is steady rather than erratic and it concentrates on dishes built from whole or untrimmed ingredients. If tightening portions changes nothing, test your yields next.