Portion control means serving the amount your recipe says, every time, weighed rather than eyeballed. It matters because every extra gram comes straight out of your profit: if your card says 150 g of chicken and you pack 175 g, you pay for those 25 g in every box while the price stays the same. In a small business, a few cents per portion quietly adds up to hundreds a month.
Why over-portioning costs so much
When you cost a dish, you start from a portion: so many grams of rice, so many of chicken. That cost is the basis of your price. If you actually serve more, the real cost goes up and the price does not, so the difference comes out of your margin. Your food cost percentage climbs without a single price changing.
Nobody over-portions on purpose. It is the scoop that holds more than you think, the extra spoonful "so it looks full", the regular who gets a bit more. Each one is small. What hurts is that it repeats in every box, every day.
How to calculate what you lose
Three steps:
- Excess per portion, in grams: what you actually serve on average minus what the card says.
- Cost of the excess: extra grams × cost per gram of the ingredient as served.
- Loss per month: cost of the excess per portion × portions sold per month.
For step 2, use the cost of the ingredient in the state you serve it. Chicken loses weight when it cooks, so a gram of cooked chicken costs more than a gram of raw. If raw breast keeps 70% of its weight after cooking, the cooked cost per kg is the raw price divided by 0.70. Rice works the other way: it gains water, so cooked rice is cheaper per gram than dry.
To find out what you really serve, do not guess. Pick a normal day, weigh ten portions in a row without warning whoever is packing, and take the average.
Worked example: meal prep boxes
You sell chicken, rice and vegetable meal prep boxes at $9.50 before tax. Your card says 150 g of cooked chicken, 180 g of cooked rice and 120 g of vegetables. Food cost for the box is $3.20, and after packaging, labour and delivery each box leaves you a contribution of $4.00.
Cost per gram as served:
- Chicken breast: $9.80 per kg raw, keeps 70% of its weight when cooked. Cooked cost: 9.80 ÷ 0.70 = $14.00 per kg, or $0.014 per gram.
- Rice: $2.00 per kg dry, and it weighs 2.5 times as much once cooked. Cooked cost: 2.00 ÷ 2.5 = $0.80 per kg, or $0.0008 per gram.
What you measured: you weighed ten boxes on a Monday. Chicken averaged 175 g and rice 220 g.
| Card | Served | Excess | Cost of excess | |
|---|---|---|---|---|
| Cooked chicken | 150 g | 175 g | 25 g | 25 × 0.014 = $0.35 |
| Cooked rice | 180 g | 220 g | 40 g | 40 × 0.0008 = $0.03 |
| Total per box | $0.38 |
With more decimals: 0.35 + 0.032 = $0.382 per box.
Per month: you sell 200 boxes a week, about 800 a month. 800 × 0.382 = $305.60 a month handed out without anyone deciding to.
Against what you earn: of the $4.00 contribution per box, $0.38 goes on extra portions. That is 0.382 ÷ 4.00 = 9.6% of what each box leaves you.
Food cost percentage: on paper, 3.20 ÷ 9.50 = 33.7%. In reality, (3.20 + 0.382) ÷ 9.50 = 37.7%. Four points of food cost from portioning alone.
Notice which ingredient matters. The rice excess is bigger in grams, but the chicken excess costs more than ten times as much. Start with the protein.
Now compare that with another way of saving. If you found chicken $0.50 per kg cheaper raw, that is 0.50 ÷ 0.70 = $0.71 per kg cooked, or 150 g × $0.00071 = $0.11 per box. Correct portions save you more than three times what that supplier switch would. Before swapping an ingredient for a cheaper one, make sure you are serving what you priced.
Simple tools that work
You do not need expensive equipment. You need the right amount to be the easiest amount to serve.
- Digital kitchen scale with a tare button. Put the empty box on it, zero it, fill to the number.
- Portion scoops. Weigh what your scoop holds when level. If it holds 130 g and the portion is 180 g, nobody will hit it. Find one that holds 90 g and the portion is two level scoops.
- Portion at prep, not at packing. Weigh cooked chicken into portions straight after cooking, while the batch is in front of you. At packing time, each portion is ready.
- Containers with a fill line. For soups, sauces and drinks, a marked container beats any instruction.
- A photo of the standard box where packing happens, with the weight of each component next to it.
- A weekly check. Weigh five random boxes once a week and record the average. If it creeps up, fix it that day, not at month end.
Portions also depend on how you buy. If your portions do not divide neatly into the packs you buy, every pack leaves leftovers that end up in someone's box. See adjusting recipes to the pack sizes you buy so what you buy and what you serve line up.
The portion belongs on the card
Portion control starts on paper. If your standard recipe card does not say how many grams go in each box, nobody can follow it, including you. Write the weight of each component and the total, and cost the dish from those same numbers.
If you want to be generous, decide it. A 200 g rice portion that you promise and deliver is better business than 180 g on the card and 220 g in the box. If you give regulars a little extra, put a number on it: how much, to whom, what it costs per month. Deliberate generosity is a sales tool. Accidental generosity is waste.
Under-portioning is a problem too: customers notice and do not come back. What you want is every box matching the last one. The guide to recipe costing, yield and waste shows the full method so your portions and your costs come from the same numbers.
Do it with the calculator
Put your recipe into the food cost calculator twice: once with the grams you actually serve and once with the grams on your card. The difference in cost per portion is what skipping portion control is costing you.
Frequently asked questions
How do I know if I am over-portioning?
Weigh ten portions in a row on a normal day, without warning whoever is serving, and compare the average with the weight on your recipe card. If the average is higher, you are over-portioning.
What scale do I need for portioning?
A digital kitchen scale that reads to 1 g and holds at least 5 kg covers almost everything. Make sure it has a tare button so you can weigh straight into the box or plate.
Will smaller portions drive customers away?
The aim is the same portion every time, not a small one. If you want to be generous, put the generous portion on the card and cost it; the damage comes from portions nobody decided.
Which ingredient should I control first?
The most expensive per gram in the dish, which is usually the protein. An extra 25 g of chicken costs far more than an extra 40 g of rice.