One tablespoon of baking powder weighs 12 g (spooned and levelled, King Arthur Baking). That single number is the difference between a cake that rises tall and one that collapses in the middle, because baking powder is the most powerful ingredient in the bowl by weight: a tablespoon too many leaves a bitter, metallic taste and a crumb full of holes, while a tablespoon too few gives you a dense brick. Most recipes measure baking powder in teaspoons, so the tablespoon figure matters most when you are scaling a recipe up, converting a big batch of pancake mix, or checking a recipe that was written in grams. All weights on this page are approximate — baking powder settles in the tin, so verify with a scale when the bake matters.
How much does 1 tablespoon of baking powder weigh?
One level tablespoon of baking powder weighs 12 g, spooned and levelled, according to King Arthur Baking. That is the headline number, but a single tablespoon is rarely the whole story — most recipes use several spoonfuls, or a fraction of a cup, so the table below gives the weights you will actually reach for, from a teaspoon up to a full cup. Every figure is derived from the same source value of 192 g per cup, so the whole table is consistent. Treat all of these as approximate: spooned and levelled is a technique, not a machine setting, and two cooks measuring the same ingredient can differ by a gram or two per spoonful. When the recipe matters, weigh the ingredient on a kitchen scale instead.
| Amount | Weight (approx.) |
| --- | --- |
| 1 teaspoon | 4 g |
| 1 tablespoon | 12 g |
| 2 tablespoons | 24 g |
| 3 tablespoons | 36 g |
| 1/4 cup (4 tbsp) | 48 g |
| 1/2 cup (8 tbsp) | 96 g |
| 3/4 cup (12 tbsp) | 144 g |
| 1 cup (16 tbsp) | 192 g |
A useful rule of thumb: there are 3 teaspoons in a tablespoon and 16 tablespoons in a cup, so you can move between any of these measures by multiplying or dividing. If a recipe calls for 2 teaspoons and you only have a tablespoon measure, that is two-thirds of a tablespoon — about 8 g. If a recipe calls for a quarter cup and you only have a tablespoon, that is 4 level tablespoons. Keep the tablespoons to grams converter open while you cook and you will never need to do the arithmetic in your head.
Worked examples
A double batch of buttermilk pancakes
A Saturday pancake recipe for eight calls for 4 tablespoons of baking powder in a batter built on 4 cups of flour and 2 cups of buttermilk. At 12 g per tablespoon that is 48 g of baking powder in total. Weighing it out takes ten seconds and removes the guesswork: four level tablespoons scooped from a tin that has been open for a month can easily weigh 55 g or more, because the powder compacts as the tin is tapped and moved. That extra 7 g is enough to push the batter over the edge — the pancakes rise fast in the pan, then fall flat and taste faintly soapy. Weighing 48 g keeps the rise exactly where the recipe intended it.
Scaling a sponge cake for a crowd
A victoria sponge written for a 20 cm tin uses 2 teaspoons of baking powder. You need the same cake in a 30 cm tin for a party, so you scale everything by 2.5 and the leavening becomes 5 teaspoons, or 1 tablespoon plus 2 teaspoons — about 20 g. Here is where the tablespoon weight earns its keep: measuring 5 heaped teaspoons by eye is how cakes end up with a bitter aftertaste. Weighing 20 g on a scale is exact, and it also tells you when to stop scaling. Leavening does not scale perfectly linearly, so experienced bakers cap the increase at roughly double and accept a slightly denser crumb rather than risk the chemical taste that comes from too much baking powder.
Checking a metric recipe that lists 24 g
A European recipe for a lemon drizzle loaf lists 24 g of baking powder and no spoon measures at all. Dividing by 12 g per tablespoon gives exactly 2 tablespoons. That is a useful cross-check, because 24 g is a lot of baking powder for one loaf and it is worth confirming before you commit the batter. In this case the recipe is a large loaf with 3 cups of flour and a full cup of lemon juice, so the acid in the juice balances the leavening and 2 tablespoons is correct. If the same 24 g appeared in a small muffin recipe with no acidic ingredient, you would know immediately that something was wrong with the recipe, not with your measuring.
How to measure a tablespoon of baking powder correctly
Baking powder is measured spooned and levelled, and the technique matters more here than for almost any other ingredient because the powder is so light and so compressible. Scoop the powder into the tablespoon with a smaller spoon, letting it fall in loosely, then sweep the back of a knife across the top to level it. Never dip the tablespoon into the tin and never tap it to settle the powder — a tapped tablespoon can hold 15 g instead of 12 g, a 25 percent overdose. Keep the tin sealed between uses, because baking powder absorbs moisture from the air and loses strength over months; a tin that has been open for a year can be half dead. Test old baking powder by dropping half a teaspoon into a cup of hot water: if it fizzes vigorously, it still works. If it barely bubbles, replace it before you bake, because no amount of accurate weighing will rescue dead leavening.
When the weight matters most
Baking powder is the one ingredient where a tablespoon error changes the chemistry of the whole bake. It is a complete leavening system — baking soda plus an acid, usually cream of tartar — that releases carbon dioxide twice: once when it meets liquid, and again when it meets heat. Too much of it produces more gas than the batter structure can hold, so the bubbles merge, the crumb turns coarse and tunnelled, and the excess alkaline salts leave a metallic, soapy taste on the tongue. Too little, and the batter never lifts, giving a dense, gummy texture. The margin is narrow: most recipes use 1 to 2 teaspoons per cup of flour, so a single tablespoon already covers a whole cake. That is why weighing matters. A scale turns a fiddly, error-prone spoon measure into a single reliable number, and it is the habit that separates consistent bakers from lucky ones.
Common mistakes to avoid
The most common mistake is measuring baking powder with the same casual scoop used for flour, dipping the spoon straight into the tin and levelling by eye. That packs the powder and adds up to a quarter more than the recipe expects. The second mistake is confusing baking powder with baking soda: they are not interchangeable, and a tablespoon of baking soda weighs 18 g, not 12 g, and is roughly four times stronger as a leavening agent. Swapping them by the spoonful is how cakes turn out bitter and yellow. The third mistake is trusting an old tin. Baking powder loses strength with humidity and time, and many bakers keep a tin for years without testing it. If your cakes have started coming out flat for no obvious reason, the leavening is the first suspect, not your oven. Finally, do not mix baking powder into a wet batter and then leave the bowl standing while you answer the phone — the first rise starts the moment liquid hits the powder, and every minute on the counter is lift lost.
Frequently asked questions
How many grams is 1 tablespoon of baking powder?
One level tablespoon of baking powder weighs 12 g, spooned and levelled, according to King Arthur Baking. One teaspoon weighs 4 g. These are approximate weights — the powder compacts easily, so weigh it on a kitchen scale for the most accurate result.
How many tablespoons of baking powder are in 100 g?
There are about 8 tablespoons in 100 g of baking powder (100 divided by 12 is 8.3). In practice you would almost never measure baking powder in such a large amount — 100 g would leaven an enormous batch of batter — so this figure is mostly useful when you are scaling a commercial recipe down.
Can I use baking soda instead of baking powder?
Only with an acid and a different ratio. Baking soda is about four times stronger than baking powder and needs an acidic ingredient such as lemon juice, vinegar or buttermilk to work. As a rough guide, use 1/4 teaspoon of baking soda plus 1/2 teaspoon of cream of tartar for each teaspoon of baking powder. Do not swap them 1:1 — a tablespoon of baking soda in place of baking powder will taste soapy and bitter.
Does baking powder go bad?
Yes. Baking powder loses strength with moisture and age, typically within 6 to 12 months of opening. Test it by dropping 1/2 teaspoon into a cup of hot water: vigorous fizzing means it is still active. Store it in an airtight container in a cool, dry place and replace it if the test is weak.
Why does my cake taste bitter when I use baking powder?
A bitter or metallic taste almost always means too much baking powder. The excess alkaline salts are left behind after the gas is released. Weigh the baking powder instead of spooning it, and check that you have not confused it with baking soda, which is far stronger and tastes soapy in excess.
Related conversions
If you cook with this ingredient regularly, these pages will help: the tablespoons to grams converter for any amount, the cups to grams converter for larger quantities, and the full ingredient guide for storage, substitutes and the weight of a whole cup. You can also compare the cup weight on the Baking Powder cups to grams page or work backwards from a gram amount on the Baking Powder grams to cups page.
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