What Should You Spend on Groceries? The USDA Already Has Four Answers.

Most grocery budgets start as a round number that felt right once — $150 a week, $600 a month — and then get revised only when the bank account complains. The USDA already publishes a better starting point: four official food plans that estimate what a nutritious diet costs at home, by household size, updated from the Cost of Food reports. As of the May 2026 figures AisleAMP uses, a family of four on the Moderate plan sits at about $1,465 a month, or roughly $338 a week. That is not a ceiling. It is a benchmark most households never look at.

The four tiers, in real dollars

The plans are Thrifty, Low-Cost, Moderate, and Liberal (AisleAMP labels the top tier Abundant). Each one is a per-person monthly cost, adjusted for household size with USDA's economy-of-scale multipliers — a single adult pays a 20% premium per person; a household of four pays the base rate.

For a family of four, the weekly numbers work out like this:

Thrifty is the bare-bones plan and the basis for SNAP benefits: careful meal planning, little waste, almost no convenience food. Moderate is what the USDA treats as typical American grocery spending. Liberal / Abundant builds in more premium and prepared items. The gap between Thrifty and Liberal for that household is about $158 a week — more than $680 a month — which is why "we're spending too much on groceries" is meaningless until you know which tier you are actually in.

A couple lands lower: about $186 a week on Moderate, $145 on Thrifty. A single adult sits near $102 a week on Moderate. Same plans, different household math.

Why a round number keeps failing you

A budget of "$600 a month" does not tell you whether you are thrifty or liberal. It also does not tell you whether a $180 week is a win or a blowout. Without a household-size benchmark, every trip is graded against a number you invented under stress, which is how people end up cutting produce when they were already under the Moderate plan, or feeling fine while quietly living in Liberal territory and wondering where the money went.

The useful question is not "did I hit my number?" It is "which USDA tier does my actual spending match, and is that the tier I meant to be in?"

What AisleAMP does with this

AisleAMP's Budget Calculator takes your household size (1–8) and, optionally, the weekly budget you already use. It pulls the same USDA Cost of Food numbers — currently the May 2026 per-person bases, adjusted with the official household multipliers — and shows all four weekly tiers as comparison bars. If you enter your own budget, it highlights the closest plan, converts your number into per-day and per-person-per-day figures, and flags how far you sit under or over the Moderate plan in monthly dollars.

On the dashboard, the USDA Benchmark card does the quieter version of the same job. Once you have set a household size and completed some trips, it averages your last 30 days of spending into a weekly total, pins that total on the four-tier scale, and labels which plan you are currently living in. You do not have to remember the USDA tables. The card shows whether your real cart is Thrifty, Moderate, or drifting into Abundant.

None of that requires a perfect meal plan. It requires knowing your household size and letting a few trips create a sample.

The takeaway, with or without the app

This week, compute one number: what you actually spent on groceries over the last four weeks, divided by four. Compare it to the USDA weekly figure for your household size — about $338 for a family of four on Moderate, $186 for a couple, $102 for one person, using the May 2026 Cost of Food bases. If you are under Moderate and still stressed, the problem is probably visibility during the trip, not the size of the budget. If you are sitting near Liberal without meaning to, the fix is not another round number. It is deciding which tier you are aiming for, then shopping like that is the plan.