Heavy Cream substitute

Out of heavy cream? This calculator tells you exactly how much butter and milk to combine so the mixture has the same fat content as the cream in your recipe.

How the calculation works

The method is a fat balance: the butter-and-milk blend must carry as much fat as the cream it replaces. The butter fraction is x = (cream fat − milk fat) / (butter fat − milk fat). You need V × x grams of butter and V × (1 − x) millilitres of milk, where V is the amount of cream required.

Inputs: cream volume in ml, cream fat (10–40%), milk fat (0–6%) and butter fat (72–99%). For US products, heavy cream must contain at least 36% milkfat, whole milk about 3.25% and butter at least 80%; ghee is close to 99%. The calculation works by mass and assumes 1 ml ≈ 1 g, which is accurate enough for cooking.

One key limit: the blend matches the fat content but will not whip into peaks. Use it for sauces, soups, batters, creamy pasta and baking, not for whipped cream.

Worked example

You need about 1 cup (240 ml) of heavy cream at 36%, with whole milk at 3.3% and butter at 80%. Butter fraction x = (36 − 3.3) / (80 − 3.3) = 32.7 / 76.7 ≈ 0.426. Butter: 240 × 0.426 ≈ 102.3 g (about 7 tablespoons); milk: 240 − 102.3 ≈ 137.7 ml (a little over ½ cup).

Things to keep in mind

• Melt the butter gently and whisk it into warm milk, or blitz with a stick blender, so the mixture separates less.
• Use unsalted butter, not a spread: margarine-type products change the flavour and how the sauce behaves when heated.
• For whipped toppings this substitute will not work; you need real cream of 30% fat or more.
• In hot sauces, stir the mixture in near the end and avoid a rolling boil to prevent splitting.