Baking Soda Replacement: Ratios in Teaspoons and Grams

What to use when the box is empty: baking powder at 3 to 1, potassium bicarbonate with salt added back, sodium per spoon, and a pancake recipe that needs no baking soda.

The jar is empty and the batter is half mixed. It happens to everyone, and the swap is shorter than you'd think. If your problem is the opposite one, with baking soda in the cupboard and no baking powder, that's covered in baking soda instead of baking powder. This page goes in the other direction.

The Food Science / Lab Kitchen Note

Except where a source is named, this section is standard food chemistry.

Here's why this works. Baking soda is sodium bicarbonate, a base. When it meets an acid (buttermilk, yogurt, vinegar), it releases carbon dioxide, and those bubbles lift the batter.

Baking powder is the same bicarbonate with the acid already packed in, plus starch to keep the mix dry. Double-acting powder holds more than one acid, so it gives a first burst of gas when wet and another in the heat of the oven. (Bob's Red Mill, a source on this page, recommends double-acting powder for swaps.)

That's the reason the ratio is 3 to 1. Baking powder is only partly bicarbonate, so you need more of it to get the same lift. It also explains why a recipe built around buttermilk may need adjusting: the acid the soda was meant to use is still in the bowl, and the powder brings its own.

Three replacers compared

The table below compares published data, not finished bakes. Where no source gives a figure, the cell says so. Grams marked "our math" are conversions from King Arthur's ingredient weight chart: baking powder is 4 g per teaspoon, and baking soda is 3 g per half teaspoon, so about 6 g per teaspoon (our doubling).

Two warnings sit under that table. First, don't blend rows: take the salt amount and the potassium bicarbonate amount from the same source. Second, self-rising flour is the riskiest swap. A reader on Smitten Kitchen found aluminum in self-rising flour, which had doubled the leavening unnoticed.

Other options with no sourced proportion

These show up in the competing guides, and the table keeps to what the sources say. Where a proportion isn't sourced, the cell says so.

Potassium bicarbonate and baker's ammonia are listed by the guides with no word on where to find them. For most kitchens, baking powder is the fallback.

Sodium per spoon, our math

USDA FoodData Central (SR Legacy, read through a mirror page) lists baking soda at 27,360 mg sodium per 100 g. With King Arthur's 6 g per teaspoon, 1 teaspoon holds about 1,640 mg. That's about 71% of the FDA's 2,300 mg Daily Value.

Double-acting baking powder, the sodium aluminum sulfate type, is listed at 10,600 mg per 100 g. Other powder types differ, and none was opened for this page. At 4 g per teaspoon, 1 teaspoon holds about 424 mg, or about 18% of 2,300 mg.

A worked conversion

Say a recipe calls for 1/2 teaspoon of baking soda.

1. Baking soda weighs about 3 g per half teaspoon (King Arthur).
2. Triple the teaspoons: 1 1/2 teaspoons of baking powder.
3. Weigh it: 1 1/2 teaspoons at 4 g per teaspoon is 6 g.

On sodium, 3 g of baking soda is about 820 mg (36% of 2,300 mg). The 6 g of powder is about 636 mg (28%). Both figures are our math from the USDA values above.

Then check the rest of the recipe. If it also lists baking powder, you may already have the leavening covered. And if it uses buttermilk or vinegar, the swap changes the balance of acid, so keep the first bake plain.

Pancakes with baking powder only

This pancake recipe needs no baking soda at all. It's adapted from King Arthur Baking's Simply Perfect Pancakes, reworded and with our own gram conversion for the salt. The recipe card above has the full list and steps.

Here are the points that matter most. King Arthur beats the eggs and milk for about 3 minutes, then stirs wet into dry without beating, because lumps are fine. The butter goes in last, and the batter rests at least 15 minutes. The first side cooks about 2 minutes, until bubbles break on top, then 1 1/2 to 2 minutes on the second. Flip once.

In hot, humid weather, or if you plan to rest the batter longer, King Arthur starts with 1 cup of milk instead of 1 1/4 cups. The card lists the 2 teaspoons of baking powder in the dry mix.

On sodium, our estimate is about 716 mg for one quarter of the batch, or about 31% of 2,300 mg. The salt makes up the largest share, not the baking powder. For other baking soda recipes, see Irish soda bread or baking soda bath for pretzels.

Common mistakes

Tripling by feel. Baking powder is lighter than baking soda, so a heaped spoon can mean a lot more than you meant. Level the spoon, or weigh the 12 g.

Skipping the salt with potassium bicarbonate. The bicarbonate has no sodium, and both sources pair it with added salt. Add salt back, and pick the amount from one source. Bob's Red Mill and Healthline give different ranges.

Ignoring the taste risk. None of the three top guides says what tripling the powder does to taste. Smitten Kitchen links a metallic, slightly bitter note to aluminum-containing powder, which quick-rise bakes use in quantity. If you're tripling, reach for an aluminum-free brand.

Storage and checking your leavener

Storage time for cooked pancakes: no sourced data, so this page gives no fridge time.

The batter itself rests at least 15 minutes before cooking, per King Arthur. To check whether a tin of leavener is still active, the freshness checks live in the reverse swap article.

Where the numbers come from

The ratios come from editorial guides, not trials. Bob's Red Mill is a specialist miller's page (dated 2018, no byline). Healthline's was written by Ansley Hill, RD, LD, and updated October 15, 2026. Lemons for Lulu is a food blog from 2022, and Bless This Mess is a food blog too. They agree on 3 to 1 for baking powder but conflict on salt with potassium bicarbonate and on self-rising flour, and we found no controlled comparison of finished bakes.

The weights and sodium figures come from reference data. King Arthur's ingredient weight chart is a miller's technical reference. USDA FoodData Central SR Legacy is a nutrient database, read here through a mirror page. The 2,300 mg Daily Value comes from the FDA. The taste lead comes from a Smitten Kitchen post (2009, updated 2016) with 12 comments, which is a baker's observation and not a study.

Tips for the swap

• Weigh the baking powder when you can. 4 g per teaspoon is easier to repeat than a heaped spoon.
• Change one thing at a time on the first bake.
• Keep your leavener tin closed and dry between uses.