1 Cup Baking Soda in Grams
1 cup of baking soda weighs 288 g (spooned and levelled, King Arthur Baking). Sodium bicarbonate; needs an acid to activate. All the figures on this page are approximate conversions based on the King Arthur Baking value, so when a recipe really matters, verify with a kitchen scale.
Why weighing baking soda beats measuring it in cups
Dry pantry ingredients vary enormously in weight per cup, which is why a single conversion number never works for all of them. A cup of table salt weighs 288 g while a cup of dried oregano weighs 48 g: six times lighter, same cup. The only safe way to move between cups and grams for dry ingredients is a per-ingredient table, and that is exactly what this page gives you. Guessing, or using the weight of a different ingredient, is how a dish ends up inedibly salty or a cake fails to rise.
Sodium bicarbonate; needs an acid to activate. It is used for leavening cakes, cookies and quick breads with acidic ingredients. That range of uses is part of why the conversion comes up so often: the same ingredient appears in everyday cooking and in precise baking, and the two situations demand different levels of accuracy.
Baking Soda cups to grams conversion table
| Cups | Grams | Tablespoons (approx.) |
|---|---|---|
| 1/4 cup | 72 g | 4.5 g |
| 1/3 cup | 96 g | 6 g |
| 1/2 cup | 144 g | 9 g |
| 2/3 cup | 192 g | 12 g |
| 3/4 cup | 216 g | 13.5 g |
| 1 cup | 288 g | 18 g |
| 1 1/2 cups | 432 g | 27 g |
| 2 cups | 576 g | 36 g |
| 3 cups | 864 g | 54 g |
| 4 cups | 1152 g | 72 g |
The tablespoon column is a bonus for recipes that call for a spoonful or two: one tablespoon of baking soda weighs about 18 g. Remember that a cup is 16 tablespoons, so the numbers in the table are just the cup weight divided by 16, rounded to one decimal place. For small amounts a scale that reads to the gram is far more reliable than a spoon, because a heaped tablespoon can weigh half as much again as a level one.
How the weight was measured
Spooned and levelled means spooning the ingredient into the measuring cup until it is heaped, then sweeping a straight knife across the top to level it off. Never scoop the cup through the bag or jar, and never tap the cup down, because both pack the ingredient and add weight.
The source for the 288 g figure is King Arthur Baking, and the confidence in the value is high. King Arthur Baking publishes a standard ingredient weight chart that recipe developers use as a reference, and this page follows it exactly rather than averaging across sources, because an average of two different measuring methods is a number that matches nobody's cup.
Worked examples
Scaling a spice rub for a barbecue
A spice rub that calls for 1/4 cup of baking soda needs 72 g. Spice rubs are all about ratio, and a quarter-cup of a ground spice can vary by several grams depending on how settled the jar is. Weighing 72 g keeps the rub balanced.
A large batch of seasoned flour
A seasoned flour mix using 1 cup of baking soda needs 288 g. When you are making a big batch to keep in the pantry, weighing 288 g means every future use of the mix tastes the same as the first.
Converting a commercial recipe down
A commercial recipe that uses 2 cups of baking soda needs 576 g, and you want a home-sized batch. Dividing by weight is exact, while dividing cups by eye is guesswork, so weighing 576 g and then halving it gives a reliable home version.
When this conversion matters most
This conversion matters most when you are scaling a recipe. A teaspoon of a spice or a leavener is easy to measure, but a cup of one is a large amount, and the difference between a level cup and a heaped one can be tens of grams. That difference is enough to make a cake taste of soap, a curry taste of nothing but chilli, or a brine too salty to eat. Weighing is the only reliable way to scale dry ingredients up or down.
Common mistakes with baking soda
- Using another ingredient's weight. Dry ingredients range from 48 g to 288 g per cup, so borrowing a number from a different ingredient is the fastest way to ruin a recipe. Always use the table for the ingredient you have.
- Measuring leaveners by the cup. Baking soda and baking powder are powerful in tiny amounts. A cup measure is far too coarse for them, so weigh them when scaling recipes up or down.
- Not levelling the spoon. A heaped teaspoon of a spice can be twice the weight of a level one. Level dry ingredients with a knife every time.
- Storing spices in a damp cupboard. Ground spices absorb moisture and clump, which changes both their weight per cup and their flavour. Keep them sealed and dry.
Storage and handling
Airtight container, cool and dry, up to 6 months once opened. Keeping baking soda stored properly also keeps its weight per cup stable: an ingredient that has absorbed moisture from the air weighs more per cup than a dry one, so a sealed container is not just about freshness, it is about measurement accuracy too. If a bag has been open for months in a humid kitchen, the first thing to do before a precise bake is to weigh the ingredient rather than trusting the cup.
Frequently asked questions
How many grams is 1 cup of baking soda?
1 cup of baking soda weighs 288 g, measured spooned and levelled according to King Arthur Baking. That is the figure to use when converting a recipe from cups to grams, and it is the value the conversion table on this page is built on.
How do I measure baking soda without a scale?
Spooned and levelled means spooning the ingredient into the measuring cup until it is heaped, then sweeping a straight knife across the top to level it off. Never scoop the cup through the bag or jar, and never tap the cup down, because both pack the ingredient and add weight. That gives the closest result to 288 g per cup, but it is still an estimate: the honest answer is that a scale is the only way to know the exact weight, and a basic digital kitchen scale costs less than a bag of good flour.
Does baking soda always weigh the same per cup?
No. Brand, grind, moisture and how settled the container is all shift the weight by a few grams, and for flour the swing can be 20 g or more. The 288 g figure is the standard King Arthur Baking value for baking soda measured spooned and levelled, and it is the right default, but when a recipe is precise, weigh the ingredient and trust the scale over the cup.
Can I use the same conversion for a different brand of baking soda?
Yes, as a starting point. The 288 g figure is a standard average for baking soda, and most brands sit within a few grams of it. If you bake with one brand all the time, weigh one cup of it once and note the number on the bag, and you will have a conversion tuned to your own kitchen.
How should I store baking soda?
Airtight container, cool and dry, up to 6 months once opened. Good storage keeps the ingredient fresh and keeps its weight per cup consistent, because moisture absorbed from the air adds grams that the recipe did not ask for.
What is baking soda used for?
Leavening cakes, cookies and quick breads with acidic ingredients. Sodium bicarbonate; needs an acid to activate.
Related conversions
Use the cups to grams converter or the tablespoons to grams converter for instant answers, or browse the cups to grams hub for the full ingredient list. Related pages: Salt in cups to grams, Baking Powder in cups to grams, Cinnamon in cups to grams. More tools: cups to grams converter, tablespoons to grams converter, weight converter, spice substitute finder. See also our disclaimer about approximate conversions.