Homemade Crème Fraîche Cost Calculator

See if making your own crème fraîche saves money per cup.

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Frequently Asked Questions

What ratio of buttermilk to cream should I use?
The standard ratio is 1 to 2 tablespoons of cultured buttermilk per cup of heavy cream. More buttermilk speeds up the process slightly and produces a tangier result; less gives a milder flavor. Do not use regular (sweet) buttermilk — it must be cultured to contain the live bacteria needed for fermentation.
How long does homemade crème fraîche keep?
Stored in a sealed container in the refrigerator, homemade crème fraîche keeps for 1 to 2 weeks. Because it contains no preservatives, inspect it before use: discard if it smells off, develops mold, or has an unusual color. The natural acidity of crème fraîche acts as its own mild preservative, so it generally outlasts regular heavy cream.
Can I use ultra-pasteurized cream?
It is possible but results vary. Ultra-pasteurized (UHT) heavy cream has been heat-treated at very high temperatures, which can make fermentation slower and sometimes less reliable. Regular pasteurized heavy cream gives the most consistent results. If UHT is your only option, you may need to extend the incubation time by several hours.
Why does my crème fraîche not thicken?
The most common causes are cream that is too cold (the kitchen temperature should be 70 to 75°F / 21 to 24°C), ultra-pasteurized cream that resists culturing, or buttermilk that is too old and lacks active cultures. Try wrapping the jar in a towel to retain warmth, or placing it in an oven with only the light on. A fresh carton of buttermilk also makes a noticeable difference.
Is crème fraîche the same as sour cream?
They are similar but not identical. Crème fraîche has a higher fat content (about 30 to 45 percent vs. roughly 20 percent for sour cream), a milder, nuttier tang, and — crucially — it does not curdle when heated. This makes it ideal for pan sauces, soups, and baked dishes where sour cream would break. Sour cream is made with a different bacterial culture and a lower-fat base.

Is Homemade Crème Fraîche Really Cheaper?

Crème fraîche is one of those refrigerator staples that feels luxurious and expensive — but it is remarkably simple to make at home with just two ingredients: heavy cream and a splash of cultured buttermilk. The question is whether the DIY route actually saves money, or whether convenience wins out at your local grocery store.

The math is straightforward. A standard batch starts with one cup (half a pint) of heavy cream and a tablespoon or two of buttermilk. After 12 to 24 hours of passive incubation at room temperature, you end up with roughly a cup to two cups of thick, tangy crème fraîche. The total hands-on time is under two minutes — all the work happens while you sleep.

Store-bought crème fraîche typically runs between $3.50 and $5.00 per cup depending on brand and region. Heavy cream averages around $4.00 to $5.50 per pint, and cultured buttermilk costs roughly $2.00 to $3.00 per pint. Since a batch uses only half a pint of cream and a tiny amount of buttermilk, the ingredient cost per cup usually lands between $1.50 and $2.50 — often 40 to 60 percent less than store-bought.

Beyond cost, homemade crème fraîche has no stabilizers, thickeners, or preservatives. Many cooks find the flavor cleaner and more nuanced. You also control the thickness: a shorter incubation gives a looser, pourable consistency, while a longer rest produces something closer to thick sour cream. Once you have an established batch, you can use a tablespoon of your homemade crème fraîche as the starter for the next one, reducing your buttermilk cost to near zero over time.

Use this calculator to plug in local ingredient prices and see exactly how much you save per cup in your kitchen.