01
Baking Soda
10.01/4 tsp : 1 tsp
Use 1/4 tsp baking soda plus 1/2 tsp cream of tartar per 1 tsp baking powder; mix fresh each time
10.0
baking powder substitutes
11 substitutes · avg score 2.4 · Chemical leavening agent combining an alkali (sodium bicarbonate) and one or more acids, typically buffered with cornstarch. Produces CO2 when moistened and heated to lift quick breads, cakes, and muffins.
a kit you can assemble yourself
Baking powder is not a single substance. It is a pre-measured kit: sodium bicarbonate as the alkali, one or more powdered acids to react with it, and usually a little cornstarch keeping the two apart and dry on the shelf. Add moisture and heat and it produces carbon dioxide — the gas that lifts a muffin, a pancake, a scone.
That construction is why almost every entry below carries the same instruction: pair it with baking soda. The substitutes are not alternative leaveners. They are the acid half of the kit, and you supply the alkali yourself. Read the notes and you will see the same 1/4 tsp of baking soda recurring under entry after entry.
There is one thing you give up when you assemble it in the bowl instead of buying it in the tin, and it is worth knowing before you commit. Most commercial baking powder is double-acting: it releases a first burst of gas when the batter is wetted, then holds a second in reserve until the oven heat arrives. A homemade acid-and-soda combination is single-acting — it goes off once, immediately, and keeps going off while the bowl sits on the counter. Whatever you mix, get it into the tin and into the oven straight away.
choosing
which acid you happen to have
The cleanest replacement is the dry one. Baking soda with cream of tartar scores a full 10.0, and the instruction is 1/4 tsp of baking soda plus 1/2 tsp of cream of tartar per 1 tsp of baking powder, mixed fresh each time. The cream of tartar entry states the same pairing slightly differently, at 5/8 tsp per 1/4 tsp of soda; either lands in the working range. This is the option to reach for when the recipe has no spare liquid to give — it is a powder replacing a powder, so nothing else in the recipe has to move.
The wet acids are the other route, and they all demand a compensation somewhere. Buttermilk scores 10.0 with the clearest version of the instruction: 1/2 cup of buttermilk plus 1/4 tsp of baking soda replaces 1 tsp of baking powder, and reduce the recipe's other liquid to make room. Greek yogurt works the same way, half a cup swapped in for part of the liquid, and brings tang and tenderness with it.
If you only need a small amount, the sharp acids are easier to balance. Lemon juice, cider vinegar and distilled vinegar all follow the same pattern — 1/2 tsp of acid plus 1/4 tsp of baking soda per 1 tsp of baking powder — and vinegar has the advantage of vanishing entirely in the bake. The two vinegar entries are noted as neutral in flavour, where lemon juice will make itself known in a pale batter. Molasses at 1/4 cup plus 1/4 tsp of soda is the one that changes the recipe most, adding colour and a lot of sweetness, so reduce the sugar slightly to compensate.
Two entries are there to be ruled out, and their scores say so. Plain yogurt is described as providing acid to activate baking soda already in the recipe — not a direct leavener, which is a precise way of saying it does nothing on its own. Cornstarch has no leavening power at all. And whipped eggs at 1.7, one egg per teaspoon of baking powder, are a real technique rather than a substitution: you are folding physical air into the batter instead of generating gas chemically, which works in a pancake or a light quick bread and asks for a much gentler hand with the mixing.
convert baking powder measurements
quick swaps (averaged across uses)
02
Buttermilk
10.01/2 tsp : 1 tsp
Mix 1/2 cup buttermilk + 1/4 tsp baking soda to replace 1 tsp baking powder; reduce other liquid
10.0
03
Cream Of Tartar
5.05/8 tsp : 1 tsp
5/8 tsp cream of tartar + 1/4 tsp baking soda per 1 tsp baking powder
5.0
04
Egg
1.73 1/3 tbsp : 1/2 tbsp
Whipped eggs add structure and lift; use 1 egg per tsp baking powder in pancakes and quick breads
1.7
05
Molasses
0.01/4 tsp : 1 tsp
Mix 1/4 cup molasses + 1/4 tsp baking soda to replace 1 tsp baking powder; reduce sugar slightly
0.0
06
Lemon Juice
0.01/2 tsp : 1 tsp
Mix 1/2 tsp lemon juice + 1/4 tsp baking soda to replace 1 tsp baking powder; works in pancakes
0.0