Homemade Yogurt Cost Calculator

Q: Can I use store-bought yogurt as a starter culture?

Yes. Plain whole-milk yogurt with live active cultures works well as a starter. Use 2 to 3 tablespoons per quart of milk. The cost is typically under $0.50 per batch, and after your first successful batch you can save a few tablespoons as your next starter at no additional cost.

Is Homemade Yogurt Actually Cheaper?

Making yogurt at home is one of those kitchen projects that sounds like it should save money — and often does — but the real answer depends on a handful of variables most people never add up. Whole milk prices, the type of starter you use, batch size, and even the appliance you incubate in all affect whether your mason jar of homemade yogurt comes out ahead of a grocery store tub.

The biggest lever is milk cost. A gallon of whole milk yields roughly 3.5 quarts of finished yogurt once the whey is factored in (a bit less if you strain it into Greek-style yogurt). If whole milk runs $4.50 a gallon in your area, your milk-only cost per quart is about $1.29. Most premium store brands land between $4.00 and $7.00 per quart for full-fat yogurt, so the math usually favors homemade — but only if you account for everything.

What Goes Into the True Cost

Milk: The dominant cost. Organic whole milk can push $8–$10 per gallon, which narrows savings considerably. Conventional whole milk on sale is where homemade yogurt becomes a clear winner.

Starter culture: If you save a few tablespoons from your last batch, your ongoing starter cost is essentially zero. A store-bought plain yogurt used as starter costs $0.50–$1.00 per batch. Freeze-dried heirloom starter packets run $5–$10 but last many batches.

Electricity: An Instant Pot on yogurt mode, a dedicated yogurt maker, or even a low oven draw around 30–50 watts over 6–12 hours of incubation. At average U.S. electricity rates (~$0.13/kWh), that is typically less than $0.10 per batch — negligible, but real.

When Homemade Makes the Most Sense

Homemade yogurt saves the most money when you buy milk in bulk or on sale, reuse your own starter, make at least one gallon per batch, and compare it to premium or organic store brands. The savings widen further if you strain it into Greek yogurt, since store-bought Greek yogurt commands a significant premium while the extra whey you drain off costs you nothing extra.

On the flip side, if you are comparing to a store brand that is frequently on sale for $2–$3 per quart, and you use organic milk, homemade may not win on cost alone — though freshness, no additives, and the ability to control tartness are non-monetary benefits worth considering.

Frequently Asked Questions

How many quarts of yogurt does one gallon of milk make?

One gallon of whole milk typically yields about 3.5 quarts of regular (unstrained) yogurt. If you strain it into thick Greek-style yogurt, expect closer to 2 quarts, since roughly half the volume is whey that drains away. The calculator uses the 3.5-quart yield for standard yogurt.

Can I use store-bought yogurt as a starter culture?

Yes. Plain whole-milk yogurt with live active cultures (look for "L. bulgaricus" and "S. thermophilus" on the label) works well as a starter. Use 2–3 tablespoons per quart of milk. The cost is typically under $0.50 per batch if you portion it from a small container. After your first successful batch, save a few tablespoons as your next starter at no additional cost.

What appliance uses the least electricity for incubation?

Dedicated yogurt makers are the most efficient, typically drawing 15–20 watts. An Instant Pot on yogurt mode uses about 40 watts. A conventional oven with just the light on stays warm enough and uses 25–40 watts from the bulb alone. All are cheap to run — usually under $0.10 per batch at average U.S. electricity rates.

Does homemade yogurt save money compared to Greek yogurt?

Usually yes, and by a wide margin. Store-bought Greek yogurt often sells for $6–$8 per quart. To make Greek yogurt at home, you simply strain regular homemade yogurt through cheesecloth for a few hours. Your per-quart cost rises slightly (less yield per gallon) but remains far below store prices, especially for organic or premium brands.

Why does the calculator assume 3.5 quarts per gallon instead of 4?

A gallon equals 4 quarts by volume, but during yogurt making a small amount of whey separates and some moisture is lost even without straining. In practice, home yogurt batches yield about 3.25–3.75 quarts of finished yogurt per gallon of milk. Using 3.5 quarts as the default gives a realistic mid-range estimate. If your batches run thicker or thinner, adjust accordingly.