Kitchen waste audit: turn seven days of bin weights into a weekly cost

The audit is a management sample, not a forensic account. Suppose the kitchen records 31.6 kg during a week, of which 9.2 kg is unavoidable trim and 22.4 kg is avoidable. If the avoidable mix averages an illustrative €4.70 per edible kilogram, the baseline is about €105.28 per week, not 31.6 kg multiplied by the price of the most expensive protein. Accuracy improves when each category receives its own sensible cost, but consistency matters more than debating whether one tray was worth €8.10 or €8.35.

Build four bins that point to four different fixes

• Spoilage: expired dairy, wilted leaves, discoloured protein, and damaged produce. Record the item and delivery or prep date; the likely levers are ordering frequency, rotation, storage, and pars.
• Overproduction: cooked food never served, including buffet remainder and excess batch prep. Note planned covers versus actual covers so the loss can inform the next forecast.
• Preparation loss: edible material removed through poor knife work, incorrect thawing, burnt batches, dropped food, or recipe mistakes. Keep normal shells, bones, and peelings marked as unavoidable.
• Plate returns: edible food sent back by guests. Add a brief reason such as portion too large, side disliked, quality issue, or order error; do not ask servers to write an essay.

From the scale display to an honest euro estimate

Run the week without turning the pass into a paperwork desk

1. 1Prepare the station. Tare the scale with each empty container, print four colour-coded labels, and place the log beside the disposal point. Agree that unavoidable trim is weighed separately rather than mixed into avoidable waste.
2. 2Capture every shift. At prep close, changeover, and service close, weigh each stream. Enter kilograms, food item, category, and a reason of no more than five words. A supervisor checks missing shifts before staff leave.
3. 3Price the seven days. Match edible waste to invoice or recipe cost per kilogram. Where a delivered item has 80% usable yield, divide purchase price by 0.80 before valuing edible loss; leave genuine inedible trim out of the avoidable euro total.
4. 4Choose and retest. Sort the spreadsheet by weekly euros, select the largest controllable cause, and set one rule—for example reducing Tuesday rice par from 12 kg to 9 kg. Operate it for 14 days, then repeat the same seven-day measurement.