What a week of family dinners actually costs
Ask most households what a week of dinners costs and you'll get a round number said with no confidence: "I don't know, two hundred?" It's a guess, and it's usually low — because the guess only counts the shop you meant to do, not the two top-up trips and the handful of things that appeared in the trolley on the way to the till.
Here is the honest version: seven home-cooked dinners for a household of four, costed ingredient by ingredient. The prices below are illustrative — they'll move with your country, your shops, and the season — but the shape of the number is the part worth paying attention to.
Seven dinners, itemised
| Night | Dinner | Cost to cook (serves 4) |
|---|---|---|
| Monday | Lentil and squash traybake | $9.30 |
| Tuesday | Chicken orzo, lemon and dill | $14.60 |
| Wednesday | Miso butter salmon, charred greens | $19.20 |
| Thursday | Sheet-pan chicken thighs | $12.80 |
| Friday | Homemade pizza night | $11.00 |
| Saturday | Slow-cooked beef ragù | $13.50 |
| Sunday | Roast chicken with the trimmings | $12.40 |
That comes to about $92.80 for the week, or roughly $3.31 a serving. For a lot of households that number lands lower than they expected — home cooking, even with a piece of salmon in the mix, is cheaper per plate than people assume.
So why does the monthly grocery bill feel so much heavier than four times ninety-two dollars?
Because dinners are the part you can see
The table above is only the meals you planned. It doesn't include:
- Breakfasts and lunches — the quiet, every-single-day spend that never feels like an event.
- The top-up trip. You run out of milk on Wednesday, go for milk, come back with milk and four other things.
- Snacks nobody planned. The crisps, the second coffee, the treat that ends a long day.
- Waste. The half a bag of spinach that turned, the bread that went stale — money spent, never eaten.
None of that shows up in a recipe cost. All of it shows up on the receipt. The gap between "what the meals cost" and "what we actually spent" is the entire reason grocery budgets feel impossible to pin down.
Why the estimate is always wrong
Most meal-planning tools cost your week by adding up recipe ingredients from a price database. It's a reasonable model, and it is always at least a little wrong, for a predictable reason: a recipe database doesn't know your household. It doesn't know that your shop rounds up to the nearest larger pack, that your teenager eats one and a half portions, or that you bought the branded miso because the shop was out of the cheaper one.
An estimate tells you what a careful, disciplined version of your week should cost. The receipt tells you what your actual week did cost. Those are different numbers, and only one of them is real.
The only honest number is the one at the bottom of the receipt
If you want to know what your groceries cost, there is exactly one reliable source: the receipt. Everything else is a projection.
That's the thinking behind how Supper handles budgeting. Instead of estimating your spend from recipes, it reads the receipt — you photograph it, and the line items get logged automatically, tied to whoever paid. Every shop becomes a point on a chart you can drill into by week, month or year, with a trend line and a projection of where the month is heading. You find out you're on pace to go over in the second week, when you can still do something about it — not on the first of next month, when you can't.
What to actually do with the number
Once you can see the real figure, the useful moves are dull and effective:
- Get a baseline. Track a normal month without changing anything. You cannot set a budget you can hold until you know what "normal" costs.
- Set one cap for the household, not per person. Groceries are a shared cost; make them a shared number.
- Watch the projection, not the total. The total is history. The projection is the part you can still change.
- Look at the gap. The distance between your planned dinners and your real receipts is where the money actually goes — usually the top-ups and the snacks, not the meals.
Home-cooked dinners are rarely the problem. They're the cheapest, most visible part of the week. The spend that surprises you is everything around them — and you can't manage what you're guessing at.
If your household also eats to different goals — someone cutting, someone bulking, kids somewhere in between — the per-serving cost still holds. You just portion the same dinner differently for each person, which is its own small skill worth having.