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Grocery budget for two people a month
Look up the current USDA Food Plans cost of food at home report, take the per-person figure for each adult's age and sex, add them, then apply the household-size adjustment for a two-person household, which is a smaller upward premium than the one-person adjustment. Set that as one shared Groceries envelope both people can see, refill it weekly, and agree in advance on what counts as groceries and who logs the shop.
Getting the two-person number
Use the USDA Food Plans as the anchor. The Food and Nutrition Service publishes a monthly cost of food at home report with per-person figures by age and sex at four tiers: Thrifty, Low-Cost, Moderate-Cost and Liberal. Pull the current month's report, find the row for each adult, add the two figures, then apply the household size adjustment the report specifies for a two-person household. That adjustment is an upward one, but smaller than the single-person premium, because two people can buy standard package sizes and cook standard recipes without the same waste. Do not quote a number from an article for this, including ours. Food prices move and the report is updated monthly, so getting the current one takes minutes and is worth it.
Two adults, two different diets
The main reason a couple's grocery envelope misses is that it was sized as if two people eat the same way. They rarely do. One person eats meat and the other does not, one drinks a specialty coffee daily, one does high-protein meal prep and buys accordingly, one has an allergy that makes half the staples off limits. Each of those is a real cost difference and none of them show up in a single averaged number. Sit down once and list what each person buys that the other does not. You are not doing this to police anyone. You are doing it so the envelope is set at a number that reflects your actual household rather than one that guarantees an overrun every month followed by an argument.
Who logs the shop
A shared envelope only works if both people can see the current balance and both purchases land in it. The failure is predictable: one person does most of the shopping and the other picks up items on the way home, those small trips never get recorded, and the envelope reads as fine until it suddenly is not. Agree on one rule and keep it, which is that whoever pays logs it immediately, before leaving the parking lot. In Envelope Budget the entry is manual, which sounds like a downside and is actually the mechanism, because typing the amount is the moment you notice it. The alternative, where nobody logs and you reconcile from statements weeks later, gives you history instead of control.
Define the envelope boundaries in advance
Decide together what a grocery store trip is allowed to contain. Household supplies, paper goods and cleaning products, pet food, alcohol, over-the-counter medicine and the occasional dish rack all get bought at the same store on the same receipt, and every one of them will inflate a grocery envelope until the number looks impossible. Either split them into their own envelopes and split the receipt at the register, or explicitly include them and set the envelope higher to match. Both are fine. What does not work is leaving it undecided, because then the two of you are effectively using different definitions and the monthly review turns into a disagreement about arithmetic that is really a disagreement about rules.
The weekly refill and the warehouse run
Fund the envelope weekly rather than monthly, dividing your monthly figure by 4.3, because a weekly balance gives you a signal you can act on while you are still in the store. Weekly funding also solves the specific couples problem of the Sunday warehouse club run, where a single large trip consumes a big share of the month in one transaction and everything after it feels like a failure. If you shop that way, either fund the envelope biweekly to match your real cycle, or treat bulk staples as a separate small envelope so the weekly food money stays clean. And check the envelope before either of you goes, since the recurring I thought you already went problem is solved by a shared balance, not by better memory.
The envelope change to make today
Set one shared Groceries envelope at your USDA-derived two-person number, refill it weekly, and make sure both people have it visible on the home-screen widget. Then run it for a month before adjusting anything. At the end of the month, look at what the leftover or the overrun is telling you: consistent leftover means the tier was set too high and the difference belongs in a savings goal you both chose; consistent shortfall in the last week usually means non-food items are landing in the envelope, or that one person's specialty items were never counted. Fix the definition first and the number second. Most couples find the definition was the problem.
Common questions
Should a couple use one grocery envelope or two?
One shared envelope for household food works best for most couples, because that is how the shopping actually happens and a shared balance ends the coordination problem. Where two envelopes help is with genuinely individual food spending, such as one person's daily coffee or specialty items the other never touches. Some couples run a shared grocery envelope plus a small personal envelope each that nobody has to justify. That structure removes the most common source of friction, which is not the total amount but the feeling of being audited on small individual purchases.
Is a two-person budget just double the one-person budget?
No, it is less than double per person. The USDA Food Plans apply a household size adjustment that adds a premium to smaller households, and the premium for two people is smaller than for one. That reflects reality: two people buy standard package sizes, waste proportionally less produce, and can cook a four-serving recipe with the leftovers actually getting eaten. So take each adult's per-person figure, add them, then apply the two-person adjustment from the current report rather than the one-person adjustment. The difference between doing this correctly and doubling a solo number is meaningful over a year.
How do we handle one person eating out for work?
Put it in a restaurant or work lunch envelope, not in groceries, and size it from actual history rather than intention. Keeping it separate does two things. It stops the grocery envelope from absorbing a cost it was never sized for, and it makes the real tradeoff visible, since packed lunches move money from one envelope to the other and you can see exactly how much. Review both lines together monthly. If total food spending is the problem, this is usually where the largest and least painful reduction is available.
Run this budget on your phone
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