Baking Soda: Grams to Cups
1 cup of baking soda = 288 grams
One US cup of baking soda weighs 288 grams. One 250 ml metric cup — the one used in the UK, Australia, New Zealand and Canada — holds 304 grams. To convert any weight, divide the grams by the figure for your cup.
Baking soda weighs about 6 g per teaspoon (King Arthur Baking: 3 g per ½ teaspoon), about 288 g per cup — heavier than baking powder, which contains lighter starch.
Where the 288 g figure comes from
- King Arthur Baking ingredient weight chart: Baking soda, 1/2 teaspoon = 3 g (about 288 g per cup) (chart)
This site uses 288 g per US cup of baking soda, spooned and levelled. References checked September 2026.
How many cups is X grams of baking soda?
| Grams | US cups | Metric cups | Tablespoons | Ounces |
|---|---|---|---|---|
| 25 g baking soda | ⅛ | ⅛ | 1.39 | 0.88 |
| 50 g baking soda | ⅛ | ⅛ | 2.78 | 1.76 |
| 75 g baking soda | ¼ | ¼ | 4.17 | 2.65 |
| 100 g baking soda | ⅓ | ⅓ | 5.56 | 3.53 |
| 110 g baking soda | ⅜ | ⅜ | 6.11 | 3.88 |
| 120 g baking soda | ⅜ | ⅜ | 6.67 | 4.23 |
| 125 g baking soda | ⅜ | ⅜ | 6.94 | 4.41 |
| 130 g baking soda | ½ | ⅜ | 7.22 | 4.59 |
| 140 g baking soda | ½ | ½ | 7.78 | 4.94 |
| 150 g baking soda | ½ | ½ | 8.33 | 5.29 |
| 170 g baking soda | ⅝ | ½ | 9.44 | 6.00 |
| 175 g baking soda | ⅝ | ⅝ | 9.72 | 6.17 |
| 200 g baking soda | ⅔ | ⅔ | 11.11 | 7.05 |
| 225 g baking soda | ¾ | ¾ | 12.5 | 7.94 |
| 240 g baking soda | ⅞ | ¾ | 13.33 | 8.47 |
| 250 g baking soda | ⅞ | ⅞ | 13.89 | 8.82 |
| 275 g baking soda | 0.95 | ⅞ | 15.28 | 9.70 |
| 300 g baking soda | 1.04 | 1 | 16.67 | 10.58 |
| 350 g baking soda | 1¼ | 1⅛ | 19.44 | 12.35 |
| 400 g baking soda | 1⅜ | 1⅓ | 22.22 | 14.11 |
| 450 g baking soda | 1.56 | 1½ | 25 | 15.87 |
| 500 g baking soda | 1¾ | 1⅝ | 27.78 | 17.64 |
How to measure baking soda accurately
The 288 g figure assumes the spooned-and-levelled method: spoon the baking soda into a dry measuring cup and sweep the top flat with a straight edge. Scooping the cup through the bag compacts it and gives a heavier cup.
- 1 US cup of baking soda = 288 g
- 1 metric cup (250 ml) of baking soda = 304 g
- ¾ cup = 216 g
- ½ cup = 144 g
- ⅓ cup = 96 g
- ¼ cup = 72 g
- 1 tablespoon = 18.0 g
Frequently asked questions
How many cups is 100 grams of baking soda?
100 grams of baking soda is about ⅓ US cups, based on 288 g per cup, or ⅓ metric cups.
How many grams in a cup of baking soda?
One US cup of baking soda weighs 288 grams. A 250 ml metric cup holds 304 grams.
How many cups is 250 grams of baking soda?
250 grams of baking soda is about ⅞ US cups, or ⅞ metric cups.
Does a UK cup of baking soda weigh the same as a US cup?
No. A UK, Australian or Canadian metric cup is 250 ml against the US 236.6 ml, so it holds about 5.7% more — 304 g of baking soda rather than 288 g.
How many tablespoons is 100 grams of baking soda?
100 grams of baking soda is about 5.56 tablespoons.
See also: Baking Soda and Baking Powder.