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Making pad thai at home vs buying pad thai calculator
Put your days, home cost and buying cost in: 20 days at $9.00 at home is $180.00 a month against $340.00 bought at $17.00, so home saves $160.00 a month.
★ COMPARISONS · FOOD · HOME VS BUYING PAD THAI
Home Pad Thai vs Buying Pad Thai: Save $160 a Month
On the defaults — 20 pad thai days a month, $9.00 a day at home against $17.00 a day bought — home pad thai costs $180.00 a month against $340.00 bought, so home saves $160.00 a month and $1,920.00 a year. This is the PAD THAI version of the daily-habit comparison — the making-sushi-at-home-vs-buying-sushi page is the SUSHI version — 20 days at $9.00 at home against $18.00 bought; 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; and the making-curry-at-home-vs-buying-curry page is the CURRY version — home cooking against takeaway, priced day by day.
What does $160.00 a month of home pad thai saving mean?
It means that 20 pad thai days cost $180.00 cooked at home — $9.00 a day in ingredients — against $340.00 bought at $17.00 a day, so cooking at home keeps $160.00 a month and $1,920.00 over a year. The two totals are the whole story in miniature: the home total scales with the ingredient cost per day, while the buying total scales with the takeaway price per day, and the gap between them is the saving. The part people get wrong is comparing the daily prices without the day count: $9.00 against $17.00 is an $8.00-a-day gap, but the monthly saving is that gap times the days you actually eat pad thai — $160.00 over 20 days, not $8.00. The other part people get wrong is pricing home cooking at $0.00 for pantry staples, which flatters the home side by exactly the staples share.
Three things to check before you trust the number
Is $9.00 really your home cost per day? Nine dollars is the ingredients cost of one home pad thai day, and it is the figure the home total turns on: the $11.00-home-cost branch totals $220.00 at home against $340.00 bought, so a $2.00 ingredient difference is $40.00 a month over 20 days. Price the noodles, sauce, egg, peanuts and sprouts as you buy them, and include the pantry staples at their share — a home day priced without its staples is not a home day at all.
Is $17.00 really your buying cost per day? Seventeen dollars is the full bought price per day, and it is the figure the buying total turns on: the $14.00-buying-cost branch totals $280.00 bought against $180.00 at home, so a $3.00 takeaway difference is $60.00 a month over 20 days. If delivery and tip always ride along, they belong in the $17.00 — a menu price without its delivery fee understates the bought side every single day.
Are 20 days really your pad thai days? Twenty days is the monthly count, and it is the figure both totals turn on: the 15-day branch totals $135.00 at home against $255.00 bought, so five fewer days are $40.00 less saving a month. Count days you actually eat pad thai, averaged over honest months, not the month you discovered a new sauce — a habit counted at its peak overstates the saving by exactly the extra days.
Worked example
On the defaults: 20 days a month, $9.00 a day at home, $17.00 a day bought.
- Home total per month: 20 × $9.00 is $180.00.
- Buying total per month: 20 × $17.00 is $340.00.
- Monthly saving: $340.00 − $180.00 is $160.00 a month.
- Yearly saving: $160.00 × 12 is $1,920.00.
- Break-even: buying at $9.00 a day is exactly even — $180.00 either way over 20 days.
And the other way: the home cost behind $160.00 a month of saving is $9.00 a day, and the buying cost behind it is $17.00 a day. With 0 days the model honestly shows $0.00 against $0.00, exactly even, because a habit kept zero days costs nothing on either side.
Home pad thai vs buying pad thai: the comparison table
| Case | Home total (20 days) | Buying total (20 days) | Result |
|---|---|---|---|
| Defaults: $9.00 home, $17.00 bought | $180.00 | $340.00 | Home saves $160.00 a month |
| Break-even: $9.00 home, $9.00 bought | $180.00 | $180.00 | Exactly even |
| Buying wins: $20.00 home, $17.00 bought | $400.00 | $340.00 | Home costs $60.00 more a month |
| No pad thai 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 $17.00 bought, 20 days cost $400.00 at home against $340.00 bought, so home costs $60.00 more a month and buying is the cheaper choice that month. That happens most often when premium noodles or a costly sauce delivery 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
- $14.00 buying cost, same days and home cost: $14.00 buying cost, same days and home cost: Home $180.00 vs buying $280.00 — home saves $100.00 a month.
- $11.00 home cost, same days and buying cost: $11.00 home cost, same days and buying cost: Home $220.00 vs buying $340.00 — home saves $120.00 a month.
- 15 days, same costs: 15 days, same costs: Home $135.00 vs buying $255.00 — home saves $120.00 a month.
- 25 days, same costs: 25 days, same costs: Home $225.00 vs buying $425.00 — home saves $200.00 a month.
The reverses, worked backwards
- Home cost behind $160.00 a month saving: $9.00 a day — at $9.00 a day the figures are Home $180.00 vs buying $340.00 — home saves $160.00 a month.; at the lower neighbor the figures are Home $170.00 vs buying $340.00 — home saves $170.00 a month.; at the upper neighbor the figures are Home $190.00 vs buying $340.00 — home saves $150.00 a month..
- Buying cost behind $160.00 a month saving: $17.00 a day — at $17.00 a day the figures are Home $180.00 vs buying $340.00 — home saves $160.00 a month.; at the lower neighbor the figures are Home $180.00 vs buying $320.00 — home saves $140.00 a month.; at the upper neighbor the figures are Home $180.00 vs buying $360.00 — home saves $180.00 a month..
What the defaults assume
The defaults are 20 pad thai days a month, $9.00 a day at home and $17.00 a day bought, so the headline is one household for one year with a steady pad thai habit. The model is two multiplications and one subtraction: the home total is days times the home cost, the buying total is days times the buying cost, and the saving is the buying total minus the home total, times 12 for the year. The home-cost reverse is checked at $0.50 either side, because $0.50 over 20 days is $10.00 a month; the buying-cost reverse is checked at $1.00 either side, because $1.00 over 20 days is $20.00 a month. The model does not include cooking time, takeaway wait time, or the cost of learning the recipe — price those in your own judgement, and re-check the comparison when the takeaway 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 | $340.00 — 20 × $17.00. |
| Home saving per month | buying total − home total | $160.00 — $340.00 − $180.00. |
| Home saving per year | home saving per month × 12 | $1,920.00 — $160.00 × 12. |
| Home saving per day | buying cost per day − home cost per day | $8.00 — $17.00 − $9.00. |
| Break-even buying cost | home cost per day | $9.00 a day — exactly even with home. |
| Home cost behind $160.00 a month saving | reverse | $9.00 a day: Home $180.00 vs buying $340.00 — home saves $160.00 a month. |
| Buying cost behind $160.00 a month saving | reverse | $17.00 a day: Home $180.00 vs buying $340.00 — home saves $160.00 a month. |
| 0 days | same model | Home $0.00 vs buying $0.00 — exactly even. |
| 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 $340.00 — home costs $60.00 more a month. |
Who uses this
- A home cook checking a takeaway habit — $9.00 at home against $17.00 bought over 20 days is $160.00 a month kept, with the branches showing what a cheaper takeaway or dearer ingredients do to the gap.
- A household budgeting food spending — the day count and the two daily prices separate cleanly, so the cost of cooking and the cost of buying can be planned apart.
- A budget coach pricing a swap — the reverses recover the home cost or the buying cost behind any quoted monthly saving, so a claimed saving can be checked against real prices.
- A takeaway fan deciding when to cook — the break-even of $9.00 a day says exactly when buying stops being the expensive choice, so the decision follows the numbers, not the habit.
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 includes every ingredient, whether the buying 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 pad thai at $9.00 a day for 20 days costs $180.00 vs buying pad thai at $17.00 for $340.00: home saves $160.00 a month and $1,920.00 a year. Source: Bright Side Kit, https://brightoolbox.com/making-pad-thai-at-home-vs-buying-pad-thai/, accessed 29 October 2026.
Frequently asked questions
What counts in the $9.00 home cost per day?
The ingredients for one day of home pad thai: noodles, sauce ingredients, egg, peanuts, bean sprouts and lime, priced as you actually buy them. Pantry staples you already own still count at their share of the purchase price, because a $0.00 ingredient line is how home cooking looks cheaper than it is.
Should delivery fees and tips count in the buying cost?
Yes, if you always pay them: the buying cost is the full price of the pad thai as it reaches you, not the menu price alone. A $17.00 menu price with a $3.00 delivery fee is a $20.00 buying day, and leaving the fee out understates the saving by $60.00 over 20 days.
What if I eat pad thai fewer than 20 days a month?
Enter your real day count: at 15 days the totals are $135.00 at home against $255.00 bought, so home still saves $120.00 a month. The saving scales with days, which is why the day count matters as much as the daily prices — a habit you keep 5 days a month saves a quarter of a 20-day habit.
Why is the break-even exactly $9.00 a day?
Because break-even is the buying price at which the two totals match, and the totals match when the buying price equals the home price: at $9.00 bought, 20 days cost $180.00 either way. Any buying price above $9.00 leaves home cheaper; any price below it makes buying cheaper.
Does home pad thai really save $1,920.00 a year?
Only if the 20-day habit runs all year: $160.00 a month times 12 months is $1,920.00. If pad thai is a winter habit or a summer habit, multiply the monthly saving by the months you actually keep it, not by 12 — the yearly figure assumes the habit never takes a month off.
When does buying pad thai win?
Whenever the home cost per day rises above the buying cost per day: at $20.00 a day at home against $17.00 bought, home costs $60.00 more a month. Premium noodles, a costly sauce delivery or a big takeaway discount can each flip the sign, which is why the model prices both sides instead of assuming home always wins.