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Grocery budget per person calculator
Put your monthly grocery spend, people and days in: $600 a month for 4 people is $150 per person a month — $5 a day each, $20 a day for the household.
★ MONEY · GROCERIES · HOUSEHOLD BUDGET
Grocery Budget Calculator: $150 Per Person a Month
On the defaults — $600 a month for a household of 4, over a 30-day month — a grocery budget is $150 per person a month, or $5 a person a day. This is the grocery budget per person tool: divide the monthly spend by the people for the per-person month, divide again by the days for the per-person day — a food budget guessed from the household total alone tells you nothing until the people behind it are known.
What does $150 per person a month, $5 a day each mean?
It means a household spending six hundred dollars a month on groceries, feeding four people over thirty days, spends one hundred and fifty dollars on each person in the month, which is five dollars a person a day, and twenty dollars a day for the whole household. The monthly spend sets every figure, the people set only the per-person split, and the days set only the daily figures: a bigger shop lifts every person equally, an extra mouth splits the same shop thinner without changing the household total, and a longer month spreads the same shop over more days without changing the month. The only judgement is the monthly spend itself — $600 must be the groceries actually bought, not the food budget wished for, and the spend that settles the split is the one on the receipts, not the one remembered at the till.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Per person a month | monthly spend ÷ people | $150 — $600 ÷ 4. |
| Per person a day | per person a month ÷ days | $5 — $150 ÷ 30. |
| Household a day | monthly spend ÷ days | $20 — $600 ÷ 30. |
Three things to check before you trust the number
First, check the monthly spend honestly: $600 must be groceries only, not groceries plus takeaways, not groceries plus the pharmacy aisle — a shop that mixes food with household goods overstates the food per person by exactly the non-food lines. Second, check the people against the table, not the lease: 4 people must be the people actually fed from the shop, including children who eat smaller portions but still eat, and excluding a housemate who buys their own food — a person counted wrongly splits the budget wrongly for everyone else. Third, check the days against the calendar, not a round month: 30 days suits most months, while February at 28 days lifts the daily figures and a 31-day month lowers them, and a daily figure borrowed from the wrong month misstates the day by the missing days.
Worked example
$600 a month, 4 people, 30 days. Per person a month: $600 ÷ 4 = $150. Per person a day: $150 ÷ 30 = $5. Household a day: $600 ÷ 30 = $20. In practice that means a four-person household spending six hundred dollars a month on groceries feeds each person for five dollars a day — the number to set against the food budget, and the twenty-dollar household day to use when a week of shopping is planned.
Every branch, checked
At $800 a month instead of $600, the per-person month rises to $200 — $6.67 a day each. At 3 people instead of 4, the per-person month rises to $200 — $6.67 a day each. At 31 days instead of 30, the per-person month stays $150 — $4.84 a day each. At 5 people instead of 4, the per-person month falls to $120 — $4 a day each.
The reverses, worked backwards
The monthly spend behind $150 is $600: at $400 the per-person month is $100; at $800 it is $200. The people behind $150 are 4: at 3 people the per-person month is $200; at 5 people it is $120 — more people always cut the share, because the same shop splits further. The days behind $150 are 30: at 28 days the per-person month is still $150, but the day is $5.36; at 31 days it is $4.84 — the days never touch the month, only the day.
What the defaults assume
The defaults assume a $600 monthly grocery spend feeding 4 people for 30 days, with no takeaways, no eating out, and no guest meals. They do not assume a teenager eating for two, a baby on formula, or a month of guests — a household with a heavy eater or a run of visitors spends more per person than $150, so treat $150 as the even split, not the appetite split.
Who uses this
- A household splitting the food shop: the $150 a month settles a fair share per person.
- A family planning a food budget: the $5 a day is the line to set against the weekly shop.
- A couple moving in together: the people lever shows what sharing the shop really saves.
- A budgeter checking food inflation: the per-person day is the line to compare month to month.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is the monthly spend, the people actually fed, and the days. Real food spending varies with appetites, guests, and non-food lines in the shop — so treat $150 as the planning share for a four-person household spending a true $600 a month on groceries, and check it against a month of receipts before promising it to anyone else.
Cite this calculator
Bright Side Kit, “Grocery Budget Calculator: $150 Per Person a Month”, https://brightoolbox.com/grocery-budget-per-person-calculator/, accessed 3 November 2026. Students and researchers: cite the calculator name, the page URL and the date you used it, and quote the defaults ($600 a month, 4 people, 30 days) so the result can be checked.
Frequently asked questions
How much should one person spend on groceries a month?
$150 on the defaults: $600 a month split across 4 people is $150 each, or $5 a day. Your own figure is your monthly grocery spend divided by the people it feeds — a single person spending $300 a month is also $300 a person, not $150.
Does this include eating out?
No: this page counts groceries only. Takeaways and restaurants are a separate line — add them to the monthly spend only if you want a total food figure, and say so, or the per-person day mixes two different kinds of food.
Why does adding a person lower the per-person figure?
Because the same shop splits further: $600 across 4 people is $150 each, but across 5 people it is $120 each. That only holds if the shop itself does not grow — in practice a fifth person usually lifts the shop, so enter the new shop total too.
Should children count as full people?
For this even split, yes: children eat, and the split is a budget share, not an appetite measure. For an appetite split, weight children lower and adults higher — but then say so, because the even $150 no longer applies.
Why 30 days and not 4 weeks?
Because months are 28 to 31 days, not 4 weeks: dividing by 30 gives the daily figure for a typical month. A 28-day February gives $5.36 a day on the same $150, and a 31-day month gives $4.84 — the month never changes, only the day.
How is this different from the grocery budget calculator?
That page budgets the household total; this page splits that total per person and per day. Use that page for the household figure, this page for the fair share.