Define what the audit will answer
Choose a narrow question such as why produce is discarded or how much prepared food goes uneaten. EPA emphasizes that knowing how much and why food is wasted helps identify effective prevention strategies. Do not collect detail without a decision it will inform.
Define the household and dates covered. Note unusual events such as travel, illness, parties, or a refrigerator problem so one atypical week is not mistaken for the normal pattern.
Record the event close to disposal
Capture ordinary food name, approximate amount, estimated purchase cost, and reason. Useful reasons include overbuying, hidden inventory, storage failure, schedule change, disliked food, oversized portion, and unavoidable preparation scrap.
Use a consistent unit that is easy enough to maintain: portions, pieces, cups, package fraction, or weight if a scale is already available. Perfect measurement is less important than applying the same method throughout the week.
Separate prevention from diversion
EPA's Wasted Food Scale places prevention at the top because avoiding surplus preserves the resources used to produce, transport, and prepare food. Donation or composting may be preferable to disposal in some circumstances, but they do not show that the purchase was necessary.
Separate edible avoidable food from inedible or normally unavoidable parts. Apply local rules for donation and organics. Do not encourage consuming questionable food merely to improve an audit result.
Test one response and repeat
Find the most repeated controllable reason, not necessarily the largest one-time cost. If leafy greens are repeatedly unused, test a smaller package or fewer planned salads. If leftovers are forgotten, assign a lunch when storing them.
Run the same audit again after two or three weeks using the same definitions. Compare the target category and note tradeoffs. A lower dollar estimate with more shopping trips or inadequate food may not be a useful improvement.
Match the situation before choosing an action
Where simple rules break down
How long should the first audit run?
One representative week is a practical start; repeat it to avoid overreacting to unusual events.
Must I weigh everything?
No. A consistent household-friendly unit can reveal patterns, though weight improves comparison when practical.
Does composted food count?
Track it separately. Diversion changes destination, while prevention asks whether surplus could have been avoided.
Check the underlying guidance
We reviewed the sources below on August 5, 2026. The numbered badges are a page-level navigation index; they do not mean every listed source supports every sentence in the preceding section. Agency pages can change, so use the linked page for current wording and product-specific instructions.
Household planning, shopping, storage, preparation, and waste-prevention practices.
Waste audits, prevention, purchasing, inventory, and source reduction.
Editorial boundary: This guide organizes published U.S. consumer guidance. It cannot observe your food, verify its temperature history, diagnose illness, or replace instructions for a specific product or emergency.
See outdated guidance or a factual error? Use our correction process.