The plain-language guide
Overordering or running out: which one costs more?
Every owner has felt both. The sold-out dish at 7pm, and the bag of wilted pechay on Sunday night. They do not cost the same, and for a perishable the gap is wide. Here is how to price each mistake, a grid that makes the trade visible, and the one ratio that decides where to lean.
The short answer
For a perishable the two mistakes are not the same size. Order too much and you lose the full purchase price, because spoiled stock has no resale value. Run out and you lose the margin on the missed sale, plus a customer told no. The order that balances them comes from one ratio: the cost of running short, divided by the cost of running short plus the cost of running over. Low margin and short shelf life means lean short. High margin or shelf-stable means lean long. Compute it per item. Do not guess it for the whole kitchen.
The two mistakes are not the same size
Take a kiosk that buys fresh lumpia wrappers at 60 pesos a pack and sells the finished lumpia for 80 pesos' worth per pack. Buy a pack that does not sell, and it dries out by Tuesday. Loss: 60 pesos, the whole price. Run out of wrappers on a busy Friday and miss a pack's worth of sales. Loss: 20 pesos of margin, plus a customer who wanted lumpia and got sisig instead. The bin costs three times what the sell-out costs. For that item, leaning short is the cheaper mistake, and the owner who "plays it safe" by stocking heavy is paying for the feeling.
Now change one number. Say the same wrappers go into a premium platter that sells for 200 pesos a pack. The sell-out now costs 140 pesos of margin against 60 pesos of bin. Lean long. Same supplier, same shelf life, opposite answer. The margin decides it, not the ingredient.
Shelf-stable items sit outside this entirely. A sack of rice ordered a week early is not wasted, only early. Its overorder cost is the cash tied up and the shelf space, which is real but small. That is why "order heavy" is a fine rule for rice and a costly one for tomatoes, and why one rule for the whole kitchen is always wrong for half of it. The overordering guide covers why owners lean heavy anyway: running out is loud, spoilage is quiet.
The decision matrix
Two things you control, two things you do not. You pick the order size. The day picks the demand. That gives four outcomes, and only two of them hurt.
| You ordered | Demand came in high | Demand came in low |
|---|---|---|
| A lot | Fine. It sold through. Busy day, no bin. | Paid for the bin. Full purchase price on every unit past what sold. Perishables: gone. Shelf-stable: cash tied up until it sells. |
| A little | Lost margin on every sale you could not make, plus goodwill. Some of those customers do not come back. | Fine. It sold through. Quiet day, no bin. |
The matrix does one job. It puts a name and a price on the quiet cell. Most owners already feel the top-right cell as "a bit of waste" and the bottom-left as "a disaster." For a low-margin perishable the pesos say the reverse. Writing it down per item is how the feeling and the number stop disagreeing.
The ratio that decides it
Operations textbooks call this the newsvendor problem, after the paper seller who has to pick a morning stack before knowing how many will sell. The answer is a ratio. Take the cost of running short, call it the underage cost: your margin on the sale, plus whatever a disappointed customer costs you. Take the cost of running over, the overage cost: what you paid per unit, minus whatever you can get back for the leftover, which for most perishables is nothing. The ratio is underage divided by underage plus overage. It comes out between zero and one, and it tells you what share of your demand days the order should cover. A ratio of 0.25 means order enough to cover the quieter three-quarters of your days and accept selling out on the busiest quarter. A ratio of 0.70 means cover seven days in ten. The MIT supply-chain course notes lay the same maths out formally, under the same name.
For the lumpia wrappers: underage 20, overage 60, ratio 20 over 80, or 0.25. Lean short. For the premium platter: underage 140, overage 60, ratio 140 over 200, or 0.70. Lean long. That is the whole calculation. Nothing about it needs a spreadsheet.
Try it with your numbers
25%
of your demand days the order should cover
Two honest limits. The ratio tells you where to lean, not how many units. Turning it into a number needs your daily sales, average and busy, from the forecasting guide. And "customer told no" is a real cost the calculator sets to zero, because nobody can price it well. If regulars leave over a sell-out, raise your underage cost by hand and the ratio moves right. That is a judgment call, and it stays yours.
Safety stock is not the same decision
The ratio sets how much of normal demand to cover. A cushion for a late truck or a surprise rush is a separate number, sized in days against your supplier, and it protects against a different failure. The safety-stock guide keeps the two apart.
What the studies say it costs
The most cited evidence on the money side is the Champions 12.3 business case from 2019. It followed 114 restaurants in 12 countries. In the first year those restaurants cut kitchen food waste by 26% on average, and they saved about seven dollars in operating cost for every dollar they spent on the effort. Not one site spent more than 20,000 dollars. Most of the saving came from buying less food, which is another way of saying the overage cell in the matrix was where the money had been going.
Return on reducing kitchen waste (Champions 12.3, 114 restaurants)
Average across the 114 restaurants studied. Three quarters of them had recouped the investment within one year, and 89% within two. Source: Champions 12.3, The Business Case for Reducing Food Loss and Waste: Restaurants, 2019.
On the waste side, WRAP's study of the UK hospitality and food service sector found 21% of food waste is spoilage: food bought and never cooked. That is the overage cell measured in tonnes. Food cost itself is commonly quoted in the industry at 28 to 35% of revenue. That is a trade figure, not a study, but it sets the scale: every peso of spoilage sits inside that band and never comes back out.
Where ForeFlux picks up
ForeFlux runs the same trade per item and per branch. It reads your sales history and your supplier lead times, and it lands the quantity where the ratio says to lean, then names the deadline to order it by. It says plainly when a sell-out can no longer be fixed in time. The rule does not change: we suggest, you decide. Every number is overridable, and if you know a regular is worth more than the margin says, your override wins.
It asks for a little sales history first. A brand-new account says "not enough data yet" rather than printing a ratio it cannot back. That is the same honesty this page keeps about the customer-told-no cost: if it cannot be measured, it is not invented.
Once you know where to lean, the next question is how often to order at all. Daily and weekly are not the same bet, and that gets its own guide.
Sources
- Champions 12.3, The Business Case for Reducing Food Loss and Waste: Restaurants (2019). 114 restaurants, 12 countries, 7:1 return, 26% year-one reduction, 75% recouped in year one, 89% in year two, no site above $20,000.
- MIT OpenCourseWare, 15.772J D-Lab: Supply Chains, newsvendor notes. The critical ratio: underage over underage plus overage.
- WRAP, Overview of Waste in the UK Hospitality and Food Service Sector (2013). 21% of hospitality food waste from spoilage.
- VantaInsights, Restaurant food cost percentage. The 28 to 35% industry range, citing National Restaurant Association figures. Trade figure, not a study.
Questions owners ask
Past the basics.
Help me think through the trade-offs between having too much stock and running out.
Start by pricing each mistake per unit. Too much stock on a perishable costs you the full purchase price, because a spoiled item has no resale value. Running out costs you the margin on the sale you missed, plus a customer who was told no. Now compare the two. If a unit costs 60 pesos and sells for 80, overordering loses 60 and running out loses 20. Leaning short is cheaper by a factor of three. If the same item sells for 200, running out loses 140 and the answer flips. Shelf-stable items change the maths again, because the extra is not lost, only early. The trade-off is never a feeling. It is a ratio you can compute per item in under a minute.
Compare the cost implications of overordering versus underordering using a decision matrix.
Draw a two-by-two grid. Rows: you ordered a lot, you ordered a little. Columns: demand came in high, demand came in low. Two cells are fine: a big order on a busy day sells through, a small order on a quiet day sells through. The other two are the mistakes. A big order on a quiet day means you paid full price for stock that went in the bin. A small order on a busy day means you lost the margin on every sale you could not make, and some of those customers do not come back. The matrix makes one thing visible: for a perishable, the bin cell is usually the more expensive one, unless the margin is high. That is why the safe-feeling order is often the costly one.
What do industry studies say about the impact of overordering on food cost?
The most cited study is the Champions 12.3 business case from 2019, which followed 114 restaurants across 12 countries. Restaurants there cut kitchen food waste by 26% on average in the first year and saved about 7 dollars in operating cost for every dollar they spent doing it, with no site spending more than 20,000 dollars. The savings came mostly from buying less food. On the waste side, WRAP's UK sector study found that 21% of hospitality food waste is spoilage, which is the slice buying ahead of demand creates. Food cost itself is commonly quoted in the industry at 28 to 35% of revenue. Any spoilage sits inside that number, unrecovered.
How do I stop wasting money on supplies I never use?
Find the ones that never get used, then order those to a ratio instead of a habit. For two weeks, write down every item that goes in the bin and what it cost. Take the top five. For each, compare what one unit costs you against what one unit earns you. If the cost is bigger than the margin, lean short on that item and accept the odd sell-out. If the margin is bigger, keep leaning long. Then fix the timing: order those five to a deadline set by your supplier's real lead time, not to a day of the week. Most of the money wasted on unused supplies sits in a handful of items ordered on autopilot, and the list tells you which ones.
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