Milk Substitute for Baking

The simplest milk swaps for baking

Milk does three jobs in baking: it adds liquid, it adds fat and protein, and in some recipes it adds a little acidity. A good substitute does not have to match all three, but you should know which one you are changing. The calculator above takes the cups your recipe calls for and returns the exact amount of the swap you pick, so you never have to do the fraction in your head.

• Closest overall: buttermilk, or plant milk, at a 1 to 1 swap.
• Concentrated: evaporated milk, half milk and half water.
• Thick and acidic: yogurt or sour cream, three quarters plus a quarter water.
• Last resort: water plus butter, 1 cup plus 1 1/2 tablespoons.

Volume is the first thing to get right and fat is the second. Whole milk has about 8 grams of fat per cup, 2 percent has about 5, and most plant milks have 2 to 4. That gap is why a cake made with almond milk can taste a little lean. The FDA food pages are a good reference for what each product contains, and the USDA Food Safety and Inspection Service covers how to store the dairy you do use.

Buttermilk: when the recipe wants it and you have none

Buttermilk is the swap people search for most, and the fix takes two minutes. Stir an acid into milk and let it stand, and the milk thickens slightly and turns acidic, which is exactly what baking soda needs to rise. It is not real cultured buttermilk, but in a batter it behaves the same way.

• 1 cup buttermilk = 1 tablespoon lemon juice or vinegar + milk to the 1 cup line, rested 5 to 10 minutes.
• 1 1/2 cups buttermilk = 1 1/2 tablespoons acid + 1 1/2 cups milk.
• 2 cups buttermilk = 2 tablespoons acid + 2 cups milk.

Use the same milk you would have used, dairy or plant, since the acid does the work. If you have plain yogurt, 3/4 cup of yogurt thinned with 1/4 cup of water stands in for 1 cup of buttermilk with no waiting. And if a recipe uses baking powder rather than baking soda, the acidity matters less, so a plain 1 to 1 swap with any milk works.

Worked example: a cake that needs 1 1/2 cups of milk

Take a yellow cake that calls for 1 1/2 cups of milk, 2 eggs and 1/2 cup of butter, and you have no milk in the house. Here is what each substitute gives you for that 1 1/2 cup figure:

The evaporated milk route is the closest to real milk because it keeps the dairy fat and protein, just concentrated. Stir it into the batter with the water already added. The water and butter route works but gives the thinnest batter, so expect a slightly flatter cake. Either way, keep the total liquid at 1 1/2 cups, which is the mistake most people make when they swap in a thick yogurt or a rich cream.

Every substitute at a glance

Use this table when you want the ratio without the calculator. Amounts are for 1 cup of milk, so scale them up or down with the recipe.

The fat column is the part most recipes do not spell out. Swapping whole milk for almond milk quietly removes about 6 grams of fat per cup, which shows up as a drier, faster-browning bake. Adding a teaspoon of oil per cup brings it back in line without changing the flavor.

What changes when you swap, and how to fix it

A swap is rarely a perfect match, and knowing the two or three ways it moves the bake lets you correct on the spot.

• Fat: plant milks and buttermilk are leaner than whole milk. Add 1 teaspoon of neutral oil per cup to compensate.
• Acid: buttermilk, yogurt and sour cream are acidic, which is helpful in soda-raised recipes and neutral in powder-raised ones. Do not add extra acid to a recipe that already has it.
• Protein: dairy milk has about 8 grams of protein per cup, oat milk 3 and almond milk 1. Custards, puddings and cheesecakes that set with protein need the real thing or a soy swap.
• Sugar: sweetened plant milks add sugar you did not plan for, so use unsweetened versions in baking.
• Color and browning: milk sugars drive browning, so a leaner swap can leave the top pale. A wash of milk or a minute under the broiler fixes it.

The safest rule is to keep the total liquid the same and change one thing at a time. If you swap in yogurt, thin it with water; if you swap in cream, cut it with water; if you swap in plant milk, add a little fat. Do that and most recipes come out within a shade of the original. Everything here is an estimate for planning; taste and adjust as you bake.

Storing and keeping the dairy you use safe

If you are using the dairy you already have, keep it cold. Milk, buttermilk and cream belong at 40 degrees F or below, and opened cartons keep about a week, while unopened ones hold until the date on the label. The FoodSafety.gov cold-storage chart lists the exact windows for each dairy product, and it is the reference we use for the storage numbers here.

Powdered milk is the exception that never spoils quickly. Unopened it lasts a year or more in a cool cupboard, and once mixed it keeps about 3 days in the fridge. Keep a small bag on hand and a milk shortage stops being an emergency. Yogurt and sour cream last 2 to 3 weeks opened, and both freeze poorly for texture but are fine to bake with after thawing.

One food-safety note for any swap: if a recipe uses raw egg, or you are making a no-bake filling with milk, the same cold-chain rules apply. Keep it refrigerated and use it within a few days. When you are unsure whether an opened carton is still good, the sniff test is not reliable, so go by the date and the storage time.