How to Reduce Food Waste in a Restaurant: Waste Audit, Prep Forecasting and Donation

Before you change portions or prep levels, track what you throw away for two weeks. Record the item, amount, reason and estimated cost before it goes into a mixed waste bin. The pattern will show whether your biggest problem is spoilage, overproduction, prep trim or food left on guests' plates, and that decides what to fix first: the prep plan, the order sheet, the walk-in or the portion spec. Donation and composting come after, for what you still can't prevent.

Waste is the cost cut nobody misses, which is why it sits near the top of the guide to reducing restaurant costs without hurting service. The payback is well documented. In a review of 114 restaurants in 12 countries, Champions 12.3 found that kitchen food waste fell 26% on average within a year, the average restaurant saved $7 for every $1 invested, and every site kept its total investment below $20,000. Every pound you don't throw away is a pound you didn't have to buy, so the savings land straight in your food cost.

Where restaurant food waste comes from

ReFED, a US nonprofit dedicated to reducing food loss and waste, estimates that restaurants and foodservice businesses, a group that also includes catering, cafeterias and the hospitality sector, generated 12.5 million tons of surplus food in 2024. More than 85% of it went to landfill or incineration, and less than 1% was donated. Full-service restaurants generated more than 43% of the total. ReFED breaks the surplus down by cause:

Plate waste is the surprise. Nearly 70% of the surplus is food guests were served and didn't eat, which makes it a portion and menu problem more than a kitchen-discipline one. ReFED's first recommendation for the sector is to "offer flexible portion sizes and 'à la carte' choices." Overproduction is the cause a kitchen controls most directly, and it's where a forecast pays off.

How to run a food waste audit

You can't cut what you haven't measured. Champions 12.3 put measurement first among the actions its restaurants took, noting that a food waste inventory let sites see "how much and where food was wasted." The one rule that makes an audit useful: record each item before it's mixed with anything else. Once chicken, rice and lettuce share a bin, the bin's weight can't tell you which of them you wasted. A simple audit takes two weeks:

1. Pick two ordinary weeks. Include a weekend and avoid holidays, so the numbers reflect normal business.
2. Put a scale and a log sheet where the waste happens, at the prep table, the pass and the dish station, not in the office.
3. Weigh and log each item before it goes in a bin: the item, the weight, the reason and the shift. The reasons are spoilage (expired or gone bad), prep trim, overproduction (made and never sold) and plate waste (back from the dining room), plus catering returns if you cater. Weigh a full pan of leftover chicken on its own, then tip it in.
4. If logging every item isn't practical for a category, such as mixed plate scrapings at the dish station, weigh that bin at the end of each shift and log it as a category total. Treat any cost you put on it as a category-level estimate, not an item-level finding.
5. Cost it. Multiply each item's weight by its cost per usable pound, after trimming and cooking.
6. Rank by dollars, not by weight. Ten pounds of rice and ten pounds of short rib are different problems.
7. Fix the top three, one cause at a time, then measure for another two weeks to see whether the fix held.

Worked example: Say a fast-casual restaurant's item-level log shows this in a typical week.

In this example, waste costs $337 a week, or $17,524 a year. By weight, fries and rice look like the problem. By dollars, chicken is: it's almost half the total, and it's overproduction, which a forecast can fix. The fries say the portion is too big for the guests who order it.

Prep forecasting by daypart

Prep forecasting means working out how much of each item to prep for each daypart, a part of the service day such as lunch or dinner, from expected covers, instead of prepping the same amount out of habit. Here is the method:

1. Pull item sales by daypart from your POS for the same weekday over the last four to six weeks.
2. Forecast covers for each daypart. Adjust for reservations, local events, weather, holidays and catering orders already booked.
3. Turn covers into portions: covers × the share of guests who order the item.
4. Turn portions into prep: portions × portion size, allowing for trim and cooking yield.
5. Add a buffer, set item by item. Give more to items that hold well or take long to make, and less to items that spoil within hours.
6. Cook in batches timed to each daypart, and start a second batch only when the first runs low. Champions 12.3 notes that "batch cooking, casserole trays, and buffets tend to overproduce food relative to cook-to-order preparation."
7. Record what you prepped, sold and threw out every day, and adjust next week's pars.

Worked example: Say the restaurant from the audit forecasts 400 covers on a Tuesday. Grilled chicken is served as a 4-ounce cooked portion (0.25 pounds), and the kitchen cooks 36 pounds every morning out of habit.

In this example, the forecast calls for about 30 pounds, not 36, cooked in batches before each daypart rather than all at once in the morning. That's 5.75 pounds a day less, or about 40 pounds a week, which is the chicken in the audit. At $4.00 a cooked pound (thighs at $3.00 a pound raw with a 75% cooking yield), it's $23 a day, or about $8,300 a year for a restaurant open 360 days. The 10% buffer is only an example. Set yours item by item from your prep, sales and waste records. A buffer exists so you don't run out, so an item that never sells out isn't necessarily over-prepped. The sign is leftovers: if the same item shows up in the waste log day after day, trim its buffer; if it ran short at peak, a bigger buffer may cost less than the lost sales.

The forecast is the part kitchens tend to skip, because it takes daily attention. Kutlerri.ai's Daily Prep & Waste Control Agent, which will forecast daily prep and cut waste, is coming soon and isn't available yet.

Store, order and rotate first in, first out

Spoilage is waste you paid to store. The fixes are routines:

• Order to par. Set a par for each item from what you use between deliveries plus a small safety stock, and order only the difference. Buy perishables in smaller, more frequent deliveries if your supplier allows it.
• Rotate first in, first out. Put new deliveries behind old stock, so the oldest product is the easiest to reach.
• Label and date everything. The FDA Food Code requires refrigerated, ready-to-eat food that needs time and temperature control for safety, and is held more than 24 hours, to be date-marked for no more than 7 days at 41°F or below, counting the day of preparation as day 1 (section 3-501.17). A dish made from several such ingredients keeps the date of the earliest one. Your state or county's adopted version of the code is the one that applies.
• Keep a use-first shelf for items close to their date, and have cooks check it before opening anything new.
• Look after refrigeration. Log cooler temperatures every shift and fix door gaskets and coils before they fail. A walk-in that fails overnight can mean throwing out what was in it.

Design the menu to waste less

ReFED recommends "low-waste menu design solutions, including smaller menus, product repurposing, and whole-product utilization." In practice:

• Share ingredients across dishes, so a case of herbs or a protein turns over across several plates instead of waiting on one.
• Cut dishes that rarely sell. Each one carries ingredients that spoil while they wait.
• Size portions from your plate waste. If the same side keeps coming back half-eaten, make it smaller or optional, and offer half portions.
• Make extras optional. Bread, chips and garnishes on request waste less than the same items on every plate.
• Give trim a second life in stocks, sauces, staff meals and specials, handled and stored as food.
• Sell end-of-day product. ReFED suggests dynamic pricing for end-of-day sales, such as late happy hours, for items that won't hold until tomorrow.
• Offer to-go containers for leftovers, so plate waste goes home with the guest.

Donate food you can't sell

Federal law protects restaurants that donate in good faith. The Bill Emerson Good Samaritan Food Donation Act of 1996 says a donor "shall not be subject to civil or criminal liability arising from the nature, age, packaging, or condition of apparently wholesome food" donated in good faith to a nonprofit organization for distribution to people in need. The protection doesn't cover gross negligence or intentional misconduct, and the Act doesn't override state or local health regulations.

The Food Donation Improvement Act of 2022, signed in January 2023, extended that protection. Restaurants and caterers are now "qualified direct donors," protected when they donate apparently wholesome food in good faith directly to a person in need at no cost, not only through a nonprofit.

Some states go further than protection. Under California's SB 1383, certain food businesses must donate the maximum amount of edible food they would otherwise throw away to food recovery organizations, under contracts or written agreements, and keep records of what they give.

Donation is still rare in foodservice. ReFED attributes the low rate to prepared food being "more difficult to transport, store, and distribute." To make it work:

1. Find a partner. The EPA notes that many food banks and food rescue organizations will pick up donations free of charge.
2. Agree what they'll take. Unopened stock and food that was never served are the easiest. Prepared food needs to have been held at safe temperatures and be labeled and dated.
3. Write a procedure and train the team on what can be donated, how to package and chill it, and who signs it off.
4. Ask your accountant about the tax side. The EPA points businesses to a legal guide on the federal enhanced tax deduction for food donation from the Harvard Food Law and Policy Clinic.

This is a summary, not legal advice. Check your state and local health rules before you start.

Compost what's left, and keep food out of the drain

The EPA's Wasted Food Scale ranks what to do with food from most to least preferred. Preventing waste, donating and upcycling sit at the top. Landfill, incineration and sending food down the drain sit at the bottom, and composting and anaerobic digestion fall in between. The bottom matters: the EPA estimates that food is 24% of the material in municipal solid waste landfills, and that it is responsible for 58% of landfill methane emissions to the atmosphere.

Restaurants have a long way to go here. Of the 2024 surplus, ReFED puts 77.6% in landfill and 10.3% in compost. To compost what's left:

• Ask your waste hauler whether it collects food scraps, what it accepts and what it costs compared with trash pickup.
• Check your local rules. Requirements vary by state and city. In California, for example, SB 1383 requires every jurisdiction to provide organic waste collection to all residents and businesses.
• Keep the compost stream clean. Gloves, film and plastic wrap ruin a load, so put the compost bin where the waste happens and train the team on what goes in it.
• Scrape plates into the bin, not the disposal. The EPA ranks sending food down the drain among the least preferred options because it decays in the sewer and generates methane.

Composting is the last step, not the first. Every pound you compost was still bought, stored and prepped. Prevention is where the money is.

Putting it together

Start with the two-week audit, then fix the most expensive line first. If it's overproduction, build a prep forecast for those items; if it's plate waste, resize the sides that keep coming back; if it's spoilage, tighten pars and rotation. To see what the savings do to your numbers, run them through the food cost calculator, and see what prime cost is for how food cost and labor add up.