Baking Powder and Baking Soda: Tablespoons to Grams
Using the reference weights below, 1 level US tablespoon of baking powder is about 12 g, while 1 level US tablespoon of baking soda is about 18 g. A US tablespoon contains 3 teaspoons.
- 3 min read
- Updated 2026-10-22
Printable reference chart
Use your browser’s Print command to print this chart and your scaled ingredient list.
| Level US spoon amount | Baking powder (g) | Baking soda (g) |
|---|---|---|
| ¼ tsp | 1 | 1.5 |
| ½ tsp | 2 | 3 |
| ¾ tsp | 3 | 4.5 |
| 1 tsp | 4 | 6 |
| 1½ tsp | 6 | 9 |
| 2 tsp | 8 | 12 |
| 1 tbsp (3 tsp) | 12 | 18 |
| 1½ tbsp | 18 | 27 |
| 2 tbsp | 24 | 36 |
Approximate weights calculated from 4 g per teaspoon of baking powder and 6 g per teaspoon of baking soda. Use your recipe’s own gram weights when supplied.
Scale your ingredients
Paste your recipe into the scaler below, with one ingredient per line. The starting multiplier is 0.5; change it if your recipe or pan ratio differs. This scales amounts in their original units, not baking times or ingredient densities.
Where the reference weights come from
The King Arthur Baking ingredient weight chart lists baking powder at 4 g per teaspoon and baking soda at 3 g per half teaspoon. The table here expands those reference values arithmetically into common small-batch amounts. Product and measuring differences can change the actual mass.
Scale first, then convert
For half of a recipe calling for 1 tablespoon of baking powder, the scaler above gives 0.5 tablespoon, equal to 1½ teaspoons or about 6 g. It multiplies ingredient quantities; it does not convert spoons to grams. Use the chart for that second step or open the tablespoons-to-grams converter linked below.
Keep the two leaveners distinct
Equal spoon volumes do not have equal weights here, and equal weights do not make the ingredients interchangeable. Keep the original recipe’s leavener and acidic ingredients in proportion when changing batch size. Do not replace one powder with the other using this chart.
Measure tiny quantities carefully
Use level measuring spoons, not heaped spoons or cutlery. A scale that only displays whole grams may be unsuitable for a 1 g target; use an appropriate small measuring spoon or a scale designed for small quantities. This chart uses the US tablespoon convention, not a 20 mL tablespoon.
Frequently asked questions
How many grams are in a tablespoon of baking powder?
About 12 g under the 4 g-per-teaspoon reference used here.
How many grams are in a tablespoon of baking soda?
About 18 g under the 6 g-per-teaspoon reference used here.
Does the scaler convert teaspoons into grams?
No. It scales the quantity in the original unit; use the chart or spoon converter for grams.
Can baking soda replace baking powder gram for gram?
No. Their functions and formulation differ.