How Many Grams in a Cup of Baking Soda? (288 g)
1 US legal cup of Baking Soda = 288 grams (10.16 ounces). One tablespoon = 18 grams, and one teaspoon = 6 grams.
Portion baseline measured as 1 cup according to official USDA laboratory reference testing.
Baking Soda: Fractional Cup to Grams Conversion Table
| Portion / Fraction | Grams (g) | Ounces (oz) | Equivalent Tablespoons |
|---|---|---|---|
| 1/8 cup | 36 g | 1.27 oz | 2 tbsp |
| 1/4 cup | 72 g | 2.54 oz | 4 tbsp |
| 1/3 cup | 96 g | 3.39 oz | 5.3 tbsp |
| 1/2 cup | 144 g | 5.08 oz | 8 tbsp |
| 2/3 cup | 192 g | 6.77 oz | 10.7 tbsp |
| 3/4 cup | 216 g | 7.62 oz | 12 tbsp |
| 1 cup | 288 g | 10.16 oz | 16 tbsp |
| 1 1/2 cups | 432 g | 15.24 oz | 24 tbsp |
| 2 cups | 576 g | 20.32 oz | 32 tbsp |
| 3 cups | 864 g | 30.48 oz | 48 tbsp |
| 4 cups | 1152 g | 40.64 oz | 64 tbsp |
Interactive Baking Soda Converter
Type any amount or choose a unit to calculate instant weights and volumes
Why the Weight of Baking Soda Varies in Baking
Fine crystalline minerals have high lattice density and trap almost zero air space, while fine starches compress easily under pressure. Precise gram measurement prevents chemical imbalances.
Powders & Leaveners Measuring Technique
Break up lumps before measuring. Level spoon strictly with a flat straight edge. Pure alkali requires acidic activator (buttermilk, cocoa, vinegar, lemon).
Atmospheric Altitude Context
At 5280 ft elevation, lower atmospheric pressure accelerates moisture evaporation. Ensure Baking Soda is measured strictly by weight (288g/cup) rather than volume scoop to prevent baking inconsistencies.
International Cup Size Weights for Baking Soda
Standard cup volumes vary between countries. If following a UK, Australian, or Canadian recipe, use these computed gram equivalents for Baking Soda:
| Standard Cup Standard | Volume (mL) | Calculated Grams (g) | Ounces (oz) | Primary Geographic Region |
|---|---|---|---|---|
| US Legal Cup (USDA Standard) | 240 mL | 288 g | 10.16 oz | United States (FDA nutrition labeling) |
| US Customary Cup | 236.6 mL | 283.9 g | 10.01 oz | United States (Standard kitchen measuring sets) |
| Metric Cup | 250 mL | 300 g | 10.58 oz | Australia, New Zealand, Canada, South Africa, UK |
| Imperial Cup | 284.1 mL | 341 g | 12.03 oz | Traditional British & Commonwealth recipes (1/2 pint) |
Related Powders & Leaveners Conversions
Frequently Asked Questions About Baking Soda
Why does a level teaspoon of Baking Soda weigh more than a teaspoon of flour?
Leavening salts and mineral compounds like Baking Soda are dense, non-porous crystalline structures with virtually no trapped internal air (6g per teaspoon). By contrast, wheat flour is composed of light, aerated starch granules weighing only ~2.5g per teaspoon.
What is the difference between natural and Dutch-processed cocoa powder?
Natural cocoa is untreated and acidic (pH 5–6), which reacts with alkaline baking soda to produce leavening gas. Dutch-process cocoa is washed in potassium carbonate solution to neutralize its acidity (pH 7–8), yielding a darker color and milder flavor. Because Dutch cocoa has no acid, it must be paired with double-acting baking powder.
How can I tell if my baking powder or baking soda is still fresh?
To test baking powder, stir 1/2 teaspoon into a cup of warm water; it should fizz and bubble vigorously immediately. To test baking soda, stir 1/2 teaspoon into a tablespoon of white vinegar or lemon juice; violent foaming confirms it is active.
Can I substitute baking powder for baking soda?
No, they are not 1:1 interchangeable. Baking soda is pure sodium bicarbonate (4x stronger than baking powder) and requires an acid in the recipe to activate. Baking powder already contains both an acid and a base. Replacing soda with powder requires roughly 3–4x the amount and can alter recipe taste.
Why is accurate weighing so critical for Baking Soda?
Leaveners and salts act as chemical reagents. Too much baking soda produces an unpleasant metallic taste, rapid over-rising followed by sinkholes, and coarse crumb. Too little causes dense, gummy, unrisen bakes. Measuring in exact grams prevents chemical imbalances.
Authoritative Laboratory Citation: USDA SR Legacy
Pure sodium bicarbonate: 1 cup = 288g; 1 level tablespoon = 18g; 1 level teaspoon = 6g.