Grams of baking soda to millilitres runs on one number, 0.82148693 millilitres per gram. It is a measured property of this ingredient rather than a defined conversion, which is why a generic volume-to-weight tool cannot give you it.
The density behind that figure is 1.2173 g per mL, against 1.00 for water. A cup of water weighs 236.6 g and a cup of baking soda weighs 288 g, so this ingredient is 121.7% as heavy as the same volume of water — the single fact the whole page rests on.
Baking soda has a density of 1.2173 g per mL, so 100 mL of it weighs 121.7 g and 250 mL weighs 304.3 g. That single figure is what every other number on this page is built from — water is 1.00 g per mL, so this ingredient is 121.7% as heavy as the same volume of water.
Grams are the unit this conversion is really for. A domestic scale resolves to a gram, which is 0.347% of a cup of baking soda, so weighing gets an accuracy no measuring cup can reach. A 500 g pack of it is 1.736 cups, and a 1 kg pack 3.472.
How the figure is arrived at: Denser than baking powder because there is no starch filler in it — 6 g to a teaspoon against 4 g.
The formula
grams- The amount of baking soda you are converting, in grams
0.821486932292- Millilitres per gram for baking soda, from its density of 1.2173 g/mL
millilitres- The equivalent quantity in millilitres
How it works, step by step
- Enter the quantity in grams.
- It is multiplied by 0.821486932292, the millilitres-per-gram figure for baking soda.
- The result appears in millilitres, with a second reading in tsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
50 g of baking soda in millilitres
A recipe calling for 50 g of baking soda needs 41.0743 millilitres on the scale. The arithmetic is 50 × 0.82148693 = 41.074347, and halving the recipe halves the weight to 20.5372 millilitres.
150 g of baking soda in millilitres
A recipe calling for 150 g of baking soda needs 123.223 millilitres on the scale. The arithmetic is 150 × 0.82148693 = 123.22304, and halving the recipe halves the weight to 61.6115 millilitres.
500 g of baking soda in millilitres
A recipe calling for 500 g of baking soda needs 410.743 millilitres on the scale. The arithmetic is 500 × 0.82148693 = 410.74347, and halving the recipe halves the weight to 205.372 millilitres.
How to read your score
Frequently asked questions
How many millilitres are in 1 g of baking soda?
One gram of baking soda is 0.82148693 millilitres. Half that quantity is 0.410743 millilitres and double it is 1.64297 millilitres, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of baking soda not 236 g like water?
Because weight per cup depends on what is in the cup. Baking soda has a density of 1.2173 g per mL where water has 1.00, so a cup of it weighs 288 g rather than 236.6 g. That is a difference of 51.4 g per cup, and it is the reason a single volume-to-weight factor cannot be applied to every ingredient.
Does how I measure it change the weight?
Yes, and by more than most people expect. Handling changes the weight of a cup of baking soda by roughly 20% — about 28.8 g either side of 288 g — because denser than baking powder because there is no starch filler in it — 6 g to a teaspoon against 4 g. Weighing removes the question entirely.
Is a fluid ounce of baking soda the same as an ounce?
No. A fluid ounce is a volume — one eighth of a US cup, 29.57 mL — and an ounce is a weight. One fluid ounce of baking soda weighs 1.27 oz, so the two readings differ by 27%. They coincide only for something with the density of water, and then only roughly.
Is this a US cup or a metric cup?
US customary: 236.59 mL, which is the cup every US recipe means. A metric cup is 250 mL, so the same cup of baking soda would weigh 304.33 g instead of 288 g — 16.3 g more, or 5.67%. Australian and some European recipes use the metric cup, and the difference is large enough to matter in baking.
Do I need a scale for this, or will measuring cups do?
At this size the spoon wins. One millilitre of baking soda is 1.217 g, and a scale reading to the nearest gram is working at 82.1% resolution on that — a measuring spoon is the more accurate instrument below about 5 g, which is why spice quantities are still written in spoons.
How much does 15 mL of baking soda weigh?
15 mL of baking soda comes to 18.26 g, or 18.26 grams. This page runs that calculation in reverse — enter a weight and it returns the volume — and the ml-to-grams page does it in the direction the question is usually asked.
Baking soda in grams and millilitres
| Grams | Millilitres | Unrounded |
|---|---|---|
| 5 g | 4.10743 mL | 4.107434661 |
| 10 g | 8.21487 mL | 8.214869323 |
| 25 g | 20.5372 mL | 20.53717331 |
| 50 g | 41.0743 mL | 41.07434661 |
| 100 g | 82.1487 mL | 82.14869323 |
| 125 g | 102.686 mL | 102.6858665 |
| 150 g | 123.223 mL | 123.2230398 |
| 200 g | 164.297 mL | 164.2973865 |
| 250 g | 205.372 mL | 205.3717331 |
| 300 g | 246.446 mL | 246.4460797 |
| 500 g | 410.743 mL | 410.7434661 |
| 1000 g | 821.487 mL | 821.4869323 |
Based on 288 g per cup of baking soda. One gram of baking soda is 0.82148693 millilitres.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 288 g | 10.2 oz | 236.6 mL |
| 1 tbsp | 18 g | 0.635 oz | 14.79 mL |
| 2 tsp | 12 g | 0.423 oz | 9.858 mL |
| 1 tsp | 6 g | 0.212 oz | 4.929 mL |
| 3/4 tsp | 4.5 g | 0.159 oz | 3.697 mL |
| 1/2 tsp | 3 g | 0.106 oz | 2.464 mL |
| 1/4 tsp | 1.5 g | 0.0529 oz | 1.232 mL |
| 1/8 tsp | 0.75 g | 0.0265 oz | 0.6161 mL |
US customary measures: 1 cup = 236.59 mL, 1 tbsp = 14.79 mL, 1 tsp = 4.93 mL.
| Ingredient | Grams per cup | Ounces per cup | Density (g/mL) |
|---|---|---|---|
| Ground turmeric | 144 g | 5.079 oz | 0.6087 |
| Powdered gelatin | 150 g | 5.291 oz | 0.634 |
| Baking powder | 192 g | 6.773 oz | 0.8115 |
| Vanilla extract | 202 g | 7.125 oz | 0.8538 |
| Kosher salt | 240 g | 8.466 oz | 1.014 |
| Table salt | 288 g | 10.16 oz | 1.217 |
| Baking soda (this page) | 288 g | 10.16 oz | 1.217 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.