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Making sushi at home vs buying sushi calculator
Put your days, home cost and buying cost in: 20 days at $9.00 at home is $180.00 a month against $360.00 bought at $18.00, so home saves $180.00 a month.
★ COMPARISONS · FOOD · HOME VS BUYING SUSHI
Home Sushi vs Buying Sushi: Save $180 a Month, $2,160 a Year
On the defaults — 20 sushi days a month, $9.00 a day at home against $18.00 a day bought — home sushi costs $180.00 a month against $360.00 bought, so home saves $180.00 a month and $2,160.00 a year. This is the SUSHI version of the daily-habit comparison — the making-burritos-at-home-vs-buying-burritos page is the BURRITOS version — 20 days at $6.00 at home against $15.00 bought; the making-stir-fry-at-home-vs-buying-stir-fry page is the STIR-FRY version — 20 days at $8.00 at home against $17.00 bought; the making-curry-at-home-vs-buying-curry page is the CURRY version — 20 days at $7.00 at home against $16.00 bought; and the making-tacos-at-home-vs-buying-tacos page is the TACOS version — 20 days at $5.00 at home against $14.00 bought.
What does $180.00 a month of home sushi saving mean?
It means that eating sushi at home costs $180.00 a month — 20 days at $9.00 a day for ingredients — against $360.00 a month for the same 20 sushi days bought at $18.00 each, so the home habit keeps $180.00 a month and $2,160.00 over a year. The two totals are the whole story in miniature: the home total is ingredients priced per sushi day, while the bought total is the restaurant or takeaway price for the same days, and the gap between them is the saving. The part people get wrong is pricing the bought side as the menu price alone: a $18.00 sushi with a delivery fee and a tip is not $18.00, and a bought total built on the menu price alone understates the saving. The other part people get wrong is the reverse — pricing the home side with a full weekly shop, which loads groceries that feed other meals onto the sushi days and overstates the home cost.
Three things to check before you trust the number
Is $9.00 really the home cost, or the whole shop? Nine dollars is the ingredients cost of one home sushi day, and it is the figure the home total turns on: the $12.00-home-cost branch totals $240.00 at home against $360.00 bought, so a $3.00 home-cost difference is $60.00 a month over 20 days. Price only what goes into the sushi — rice, fish, seaweed and vegetables — and leave the rest of the weekly shop out of it, or the home side carries meals it never fed.
Is $18.00 really the bought cost, or just the menu price? Eighteen dollars is the full bought price, and it is the figure the bought total turns on: the $15.00-buying-cost branch totals $300.00 bought against $180.00 at home, so a $3.00 bought-price difference is $60.00 a month over 20 days. If you always pay a delivery fee or a tip with the sushi, it belongs in the bought cost — a menu-only bought price understates the saving by exactly the fee and tip on every day.
Are 20 sushi days a month your real habit? Twenty days is the monthly count, and it is the figure both totals turn on: the 15-day branch saves $135.00 a month against the $180.00 headline, so five fewer sushi days are $45.00 a month less saving. Sushi habits vary by month, so average three honest months rather than taking your busiest month — a sushi-heavy month priced as a year-round habit overstates the saving by exactly the seasonal days.
Worked example
On the defaults: 20 sushi days a month, $9.00 a day at home, $18.00 a day bought.
- Home total per month: 20 × $9.00 is $180.00.
- Buying total per month: 20 × $18.00 is $360.00.
- Home saving per month: $360.00 − $180.00 is $180.00 a month.
- Home saving per year: $180.00 × 12 is $2,160.00.
- Break-even buying cost: $9.00 a day bought is exactly even with home — at $9.00 the two totals are both $180.00.
And the other way: the home cost behind $180.00 a month of saving is $9.00 a day, and the buying cost behind $180.00 a month of saving is $18.00 a day. With 0 sushi days the model honestly shows $0.00 against $0.00 — exactly even — because a habit with no days has no totals on either side, and with a buying cost equal to the home cost the two totals are both $180.00, which is the break-even point itself.
Home sushi vs buying sushi: the comparison table
| Case | Home total (20 days) | Buying total (20 days) | Result |
|---|---|---|---|
| Defaults: $9.00 home, $18.00 bought | $180.00 | $360.00 | Home saves $180.00 a month |
| Break-even: $9.00 home, $9.00 bought | $180.00 | $180.00 | Exactly even |
| Buying wins: $20.00 home, $18.00 bought | $400.00 | $360.00 | Home costs $40.00 more a month |
| No sushi days: 0 days | $0.00 | $0.00 | Exactly even |
When buying wins
Buying wins whenever the home cost per day rises above the buying cost per day — the saving flips sign at the break-even point of $9.00 a day. At $20.00 a day at home against $18.00 bought, 20 days cost $400.00 at home against $360.00 bought, so home costs $40.00 more a month and buying is the cheaper choice that month. That happens most often when premium fish or a costly delivery of ingredients pushes the home day above the takeaway price: the model does not assume home always wins, it prices whichever side is cheaper on the numbers you enter. At exactly $9.00 bought the two totals are both $180.00, which is the exactly-even branch, not a win for either side.
Every branch, checked
- $15.00 buying cost, same days and home cost: $15.00 buying cost, same days and home cost: Home $180.00 vs buying $300.00 — home saves $120.00 a month.
- $12.00 home cost, same days and buying cost: $12.00 home cost, same days and buying cost: Home $240.00 vs buying $360.00 — home saves $120.00 a month.
- 15 days, same costs: 15 days, same costs: Home $135.00 vs buying $270.00 — home saves $135.00 a month.
- 25 days, same costs: 25 days, same costs: Home $225.00 vs buying $450.00 — home saves $225.00 a month.
The reverses, worked backwards
- Home cost behind $180.00 a month saving: $9.00 a day — at $9.00 a day the figures are Home $180.00 vs buying $360.00 — home saves $180.00 a month.; at the lower neighbor the figures are Home $170.00 vs buying $360.00 — home saves $190.00 a month.; at the upper neighbor the figures are Home $190.00 vs buying $360.00 — home saves $170.00 a month..
- Buying cost behind $180.00 a month saving: $18.00 a day — at $18.00 a day the figures are Home $180.00 vs buying $360.00 — home saves $180.00 a month.; at the lower neighbor the figures are Home $180.00 vs buying $340.00 — home saves $160.00 a month.; at the upper neighbor the figures are Home $180.00 vs buying $380.00 — home saves $200.00 a month..
What the defaults assume
The defaults are 20 sushi days a month at $9.00 a day at home against $18.00 a day bought, so the headline is one household for one year with a steady sushi habit. The model is two multiplications and a subtraction: the home total is days times the home cost, the bought total is days times the buying cost, and the saving is the bought total minus the home total, times 12 for the year. The home-cost reverse is checked at $0.50 either side, because $0.50 a day over 20 days is $10.00 a month; the buying-cost reverse is checked at $1.00 either side, because $1.00 a day over 20 days is $20.00 a month. The model does not price your cooking time, energy costs, or the value of leftovers — add those separately if they matter to the comparison, and re-check the habit when either price changes.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Home total per month | days × home cost per day | $180.00 — 20 × $9.00. |
| Buying total per month | days × buying cost per day | $360.00 — 20 × $18.00. |
| Home saving per month | buying total − home total | $180.00 — $360.00 − $180.00. |
| Home saving per year | home saving per month × 12 | $2,160.00 — $180.00 × 12. |
| Home saving per day | buying cost per day − home cost per day | $9.00 — $18.00 − $9.00. |
| Break-even buying cost | home cost per day | $9.00 — at $9.00 a day bought, home and bought cost the same. |
| $15.00 buying cost, same days and home cost | same model | Home $180.00 vs buying $300.00 — home saves $120.00 a month. |
| $12.00 home cost, same days and buying cost | same model | Home $240.00 vs buying $360.00 — home saves $120.00 a month. |
| 15 days, same costs | same model | Home $135.00 vs buying $270.00 — home saves $135.00 a month. |
| 25 days, same costs | same model | Home $225.00 vs buying $450.00 — home saves $225.00 a month. |
| Home cost behind $180.00 a month saving | reverse | $9.00 a day: Home $180.00 vs buying $360.00 — home saves $180.00 a month. |
| Buying cost behind $180.00 a month saving | reverse | $18.00 a day: Home $180.00 vs buying $360.00 — home saves $180.00 a month. |
| 0 days | same model | Home $0.00 vs buying $0.00 — exactly even. |
| Negative days | same model | Days per month — 0 or more. |
| Negative home cost | same model | Home cost — $0 or more. |
| Negative buying cost | same model | Buying cost — $0 or more. |
| Buying cost equals home cost | same model | Home $180.00 vs buying $180.00 — exactly even. |
| Home cost above buying cost | same model | Home $400.00 vs buying $360.00 — home costs $40.00 more a month. |
Who uses this
- A home cook checking a sushi habit — $9.00 at home against $18.00 bought are $180.00 a month saved, with the branches showing what fewer days or a cheaper takeaway do to the saving before the habit changes.
- A household budgeting groceries — the home total and the bought total separate cleanly, so the cost of cooking sushi and the cost of buying it can be planned apart.
- A takeaway regular comparing the two sides — the break-even buying cost shows the exact bought price at which home stops winning, so a menu change can be judged at once.
- A meal planner costing a month of sushi — the 15-day and 25-day branches price a lighter or heavier sushi month at once, so a meal plan can be costed before the shop is done.
Accuracy & limitations
Figures are the model’s own arithmetic on the numbers you type, computed from unrounded values and displayed rounded HALF_UP to 2dp. The main limitation is the inputs, not the arithmetic: whether the home cost is ingredients alone or a loaded weekly shop, whether the bought cost includes delivery and tip, and whether the day count is an honest average are all judgement calls, and this page prices the figures you enter without checking them. This page is a calculation tool, not financial advice.
Cite this calculator
Home sushi at $9.00 a day for 20 days costs $180.00 vs buying sushi at $18.00 a day for $360.00: home saves $180.00 a month and $2,160.00 a year. Source: Bright Side Kit, https://brightoolbox.com/making-sushi-at-home-vs-buying-sushi/, accessed 29 October 2026.
Frequently asked questions
What counts in the home sushi cost?
Only what goes into the sushi: rice, fish, seaweed and vegetables. The rest of the weekly shop — breakfast, snacks, other dinners — does not belong here, or the home side carries meals it never fed.
Does the bought cost include delivery and tip?
Yes, if you always pay them: the bought cost is the full price of the sushi as it reaches you, menu price plus delivery fee plus tip. A menu-only bought price understates the saving by exactly the fee and tip on every sushi day.
What if I batch-cook rice and prepare fillings ahead?
Then the home cost per day falls, because one cooking session feeds several sushi days: divide the batch ingredients cost by the number of sushi days it feeds, and enter that per-day figure as the home cost. The model prices days, not cooking sessions.
Why 20 sushi days, not 30?
Because most sushi habits are not daily: 20 days is a working-month habit with days off and other meals in between. If you eat sushi every day, enter 30 — the model scales both totals by the day count, and the saving scales with it.
Is the saving real if I value my cooking time?
Only if the time is free to you: this page prices ingredients against bought price, not hours against wages. If cooking time has a price for you, add an hourly value times the cooking time to the home cost and re-check — the break-even buying cost moves up by exactly that amount.
What if the bought sushi is on offer?
Enter the offer price as the buying cost for the days it applies to, or run the comparison twice — once at full price, once at the offer price — and average by how often the offer actually runs. A permanent offer price is just the buying cost; a rare one is not.