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Home yogurt vs buying yogurt
Put your days per month, home cost per serving and buying cost per serving in: 20 days at $1.75 home vs $4.75 buying — home $35.00 vs buying $95.00, home saves $60.00 a month.
★ COMPARISONS · DAILY HABIT #53 · YOGURT
Home Yogurt vs Buying: Save $60 a Month, $720 a Year
On the defaults — 20 days a month, yogurt at $1.75 a serving made at home versus $4.75 bought — home yogurt costs $35.00 a month against $95.00 buying, so home saves $60.00 a month and $720.00 a year. This is daily-habit comparison #53 — the same home-versus-buying shape as the making-guacamole-at-home-vs-buying-guacamole page (20 days, $45.00 home vs $130.00 buying), the making-salsa-at-home-vs-buying-salsa page (20 days, $25.00 home vs $80.00 buying), the making-hummus-at-home-vs-buying-hummus page, and the making-popcorn-at-home-vs-buying-popcorn page — only the habit changes.
What does saving $60.00 a month on yogurt mean?
It means the home batch is $3.00 a serving cheaper than the bought serving ($4.75 − $1.75), and that gap, repeated over 20 days, is $60.00 a month and $720.00 a year. The home side is $35.00 a month; the buying side is $95.00. The saving is not the bought price and not the home price — it is the gap times the days. Double the days to 30 and the saving grows to $90.00 a month, even though neither price changed, and a household where two people eat yogurt doubles it again.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Home total per month | days × home cost per serving | $35.00 — 20 × $1.75. |
| Buying total per month | days × buying cost per serving | $95.00 — 20 × $4.75. |
| Saving per month | buying total − home total | $60.00 — $95.00 − $35.00. |
| Saving per year | saving per month × 12 | $720.00 — $60.00 × 12. |
| Break-even buying price | home cost per serving | $1.75 a day — the bought price at which home and buying tie. |
| Home cost behind a target saving | buying cost − (target saving ÷ days) | $1.75 — $4.75 − ($60.00 ÷ 20). |
| Buying cost behind a target saving | home cost + (target saving ÷ days) | $4.75 — $1.75 + ($60.00 ÷ 20). |
| Days behind a target saving | target saving ÷ (buying cost − home cost) | 20 — $60.00 ÷ ($4.75 − $1.75). |
Three things to check before you trust the number
First, the home cost must be a true per-serving cost: the milk and starter culture for a batch, divided by the servings that batch actually makes. Jars are reused, so they are not a per-serving cost, but a starter that must be bought fresh every batch is. Second, the bought price must match the serving: a large tub divided by its servings is one price, a single pot is another, and comparing a home bowl to a premium single pot flatters home cooking. Third, the days must be days you actually eat yogurt on both sides: a day you skip yogurt entirely saves nothing and belongs on neither side.
Worked example
20 days, $1.75 home, $4.75 buying. Home total: 20 × $1.75 = $35.00. Buying total: 20 × $4.75 = $95.00. Saving: $95.00 − $35.00 = $60.00 a month, $720.00 a year. The gap per serving is $3.00, and $3.00 × 20 = $60.00 — the same answer reached two ways, which is the check. If the bought price falls to $4.00, the saving falls to $45.00 a month; if home cost rises to $2.25, the saving falls to $50.00 a month.
Every branch, checked
Buying at $4.00 with the same days and home cost gives home $35.00 vs buying $80.00 — home saves $45.00 a month. Home at $1.25 with the same days and buying cost gives home $25.00 vs buying $95.00 — home saves $70.00 a month. Twelve days with the same costs gives home $21.00 vs buying $57.00 — home saves $36.00 a month. Thirty days with the same costs gives home $52.50 vs buying $142.50 — home saves $90.00 a month. Each branch changes exactly one input, so the change in the saving isolates that input.
The reverses, worked backwards
The home cost behind $60.00 a month saved is $1.75: at $1.25 the saving is $70.00 a month, and at $2.25 it is $50.00 a month — a $0.50 step moves the saving by $10.00 over 20 days. The buying cost behind $60.00 saved is $4.75: at $4.00 the saving is $45.00 a month, and at $5.50 it is $75.00 a month — a $0.75 step moves the saving by $15.00. The days behind $60.00 saved are 20: at 12 days the saving is $36.00 a month, and at 30 days it is $90.00 a month — days scale the saving in direct proportion, because the per-serving gap never changes.
What the defaults assume
The defaults assume one serving a day on 20 days a month, a $1.75 home serving, and a $4.75 bought serving, with no value placed on the time spent culturing. Time is the honest caveat: a batch takes roughly fifteen minutes of hands-on work plus hours of incubation, and makes about five servings, so the hands-on time is small per serving but not zero — if your time is worth $30.00 an hour, add about $1.50 a serving to home cost and the saving falls to about $30.00 a month. Zero days is the honest edge: $0.00 on both sides, exactly even. Negative inputs are rejected, and a home cost above the bought price — $5.50 home against $4.75 buying — honestly reports home costing $15.00 more a month.
Who uses this
A daily yogurt eater deciding whether the culturing habit pays: $60.00 a month is the prize, and the break-even of $1.75 a day is the test for any bought brand. A household budgeting breakfasts: the same gap times every eater’s days is the household saving. A lunch-packer checking the markup: the $3.00 gap per serving is what the store charges over ingredients, before its own pot and shelf costs. A home cook costing a batch: the home serving price is the milk and starter cost divided by servings, and this page turns it into a monthly figure.
Accuracy & limitations
The arithmetic is exact for the inputs entered; the judgement is in the home serving cost and the bought comparison. Milk prices swing the home cost more than any other ingredient, and a bought tub that is a larger tub is not comparable to a small home bowl. The model does not price incubation time, spoilage of a batch that outlasts its eaters, or taste — a home batch you dislike saves nothing if it sits uneaten in the fridge. This page is a calculation tool, not dietary or financial advice.
Cite this calculator
Home yogurt $1.75 vs $4.75 over 20 days: home $35.00 vs buying $95.00, home saves $60.00 a month, $720.00 a year. Break-even $1.75 a day, plus batch tips. Source: Bright Side Kit, https://brightoolbox.com/making-yogurt-at-home-vs-buying-yogurt/, accessed 30 October 2026 (2026-10-30).
Frequently asked questions
How do I price my home yogurt per serving?
Add up the batch: milk plus starter culture, then divide by the servings the batch makes. A batch that costs $8.75 and makes 5 servings is $1.75 a serving — the default here. Jars are reused, so leave them out, but count starter you must buy fresh each time.
Why is the break-even buying price exactly my home cost?
Because break-even is the bought price at which both sides cost the same, and both sides buy the same number of servings: when buying costs $1.75 a serving, 20 days cost $35.00 either way. Any bought price above $1.75 makes home cheaper; any price below it makes buying cheaper.
What if I eat yogurt twice some days?
Count servings, not days: enter the number of servings a month in the days field, or scale the days. Two servings on each of 20 days is 40 servings — enter 40 and the saving doubles, because the gap applies per serving.
Does incubation time wipe out the saving?
Usually not: a batch takes about fifteen minutes of hands-on work for roughly five servings, so at $30.00 an hour the time adds about $1.50 a serving, cutting the $60.00 saving to about $30.00 a month — still a saving. The hours of incubation need no attention, so they are not hands-on time. If you dislike culturing, the time cost is higher than any hourly rate, and buying wins on enjoyment alone.
What if the bought yogurt comes in a large tub, not singly?
Use the tub’s per-serving price: tub price divided by its servings. A $9.50 tub with 5 servings is $1.90 a serving — above the $1.75 home cost — so home still wins, but only by $3.00 a month at 20 days. The calculator only compares the two prices you enter; it never assumes single-pot prices.
Can home yogurt ever cost more than buying?
Yes, when milk or starter is dear: a premium-milk batch can pass $4.75 a serving, above the $4.75 bought price, and then home costs more a month at 20 days — $5.50 home against $4.75 buying costs $15.00 more. Enter your real batch cost — the calculator reports the honest direction, including home losing.