01
Plain Yogurt
8.01 cup : 1 cup
Thin with milk to pourable consistency; adds tang and tenderness, works in pancakes and biscuits
8.0
buttermilk substitutes
14 substitutes · avg score 5.7 · Buttermilk — a tangy cultured milk product (traditionally the liquid left after churning butter, now cultured low-fat milk). Adds acidity and tenderness to pancakes, biscuits, fried chicken marinades, and dressings.
buttermilk is an acid, delivered in dairy
Almost every recipe that calls for buttermilk is calling for its acidity. That acid does two jobs at once. It reacts with baking soda the moment the batter comes together, throwing off carbon dioxide — which is why biscuit and pancake recipes so often pair the two and tell you not to let the batter sit. And it slackens gluten and helps set egg protein a little sooner, which is what people mean when they say buttermilk pancakes are tender.
The second thing buttermilk brings is a specific body. Cultured buttermilk is thicker than milk but still pours, and it is low in fat, so it wets flour without weighing a batter down. That combination — sour, thin, lean — is why a substitution can go wrong in two different directions. Use something too thick and the batter tightens. Use something with no acid at all and a soda-leavened recipe simply will not rise.
So when you look at the list below, ask two things of any candidate: does it bring acid, and does it pour? The entries that score highest answer yes to both, and the ones you have to thin or acidify yourself carry an instruction saying so.
choosing
the cultured options, then the ones you build
The strongest swaps are already cultured, so the acid is genuine rather than added. Plain yogurt, sour cream and Greek yogurt all score 8.0, and all three carry the same instruction: thin with milk or water until it pours like buttermilk. That step is not optional — spooned in thick, they will stiffen a pancake batter and leave you with dense, gummy centres. Kefir is the closest thing to a true drop-in at 7.5, because it is already thin and already tangy; use it 1:1 with no adjustment at all. Whey, if you happen to have drained yogurt or strained cheese, is a tangy pourable liquid that scores 6.7 in baking.
Below those come the ones you assemble yourself, and this is where a detail worth knowing shows up. Milk plus 1 tbsp of lemon juice or vinegar per cup, rested five minutes to curdle, is the famous kitchen trick — and the database rates it two different ways depending on the milk. Whole milk plus acid scores 6.0. Plain milk scores 4.0, and skim, with no fat at all, also 4.0 with a note that it is still leaner than real buttermilk. That gap is real: soured milk gives you the acid perfectly well, but it does not give you the body or the richness, and in a biscuit or a fried-chicken marinade the fat matters.
If you have cream in the fridge, that gap is closable. Heavy cream at 6.0 and half-and-half at 6.0 both work by going the other way — thin them with water to buttermilk consistency, then add 1 tbsp of vinegar or lemon juice per cup. You are rebuilding the fat level and the acidity separately. Coconut milk plus lemon juice, at 4.0, is the dairy-free version of the same move and works best where a little coconut in the background is fine.
One entry is worth reading as a warning rather than an option. Baking soda plus acid scores 2.0, because it addresses only the leavening half of what buttermilk was doing. If you go that route you will get the rise and none of the tenderness, moisture, or tang.
convert buttermilk measurements
quick swaps (averaged across uses)
02
Sour Cream
8.01 cup : 7/8 cup
Thin with milk or water to pourable consistency; adds tang and richness to baking and dressings
8.0
03
Greek Yogurt
8.01 cup : 3/4 cup
Thinner; best in baking or marinades
8.0
04
Kefir
7.51 cup : 1 cup
Nearly identical tang and thin consistency; 1:1 swap in baking, marinades, and dressings
7.5
05
Whey
6.71 cup : 1 cup
Tangy liquid, similar in baking
6.7
06
Lemon Juice
6.01 cup : 1 cup
Add 1 tbsp lemon juice to 1 cup milk and let sit 5 min; creates acidic substitute for baking
6.0