To convert pounds of tapioca starch into cups, multiply by 3.7799364: one pound comes to 3.7799364 cups. Every ingredient has its own figure here, because the units are measuring different things and only the density links them.
The density behind that figure is 0.50721 g per mL, against 1.00 for water. A cup of water weighs 236.6 g and a cup of tapioca starch weighs 120 g, so this ingredient is 50.72% as heavy as the same volume of water — the single fact the whole page rests on.
A cup of tapioca starch is 120 g when it is measured the standard way, but how it gets into the cup changes the answer: between about 108 g and 144 g covers the range from lightly spooned to firmly packed. That 20% spread is larger than most of the adjustments recipes fuss over, and it disappears entirely the moment the ingredient is weighed instead.
Pounds are how tapioca starch is bought rather than cooked, so this is the bag-size arithmetic: one pound is 3.78 cups, a 2 lb pack is 7.56 cups and a 5 lb sack is 18.9. That last figure is the one worth knowing before a large bake — it tells you whether one bag covers the recipe.
What the number depends on: Sold as tapioca flour as well — the same thing under two names, which is worth knowing before buying both.
The formula
pounds- The amount of tapioca starch you are converting, in pounds
3.77993641667- Cups per pound for tapioca starch, from its density of 0.50721 g/mL
cups- The equivalent quantity in cups
How it works, step by step
- Enter the quantity in pounds.
- It is multiplied by 3.77993641667, the cups-per-pound figure for tapioca starch.
- The result appears in cups, with a second reading in tbsp beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
3/4 lb of tapioca starch in cups
3/4 lb of tapioca starch weighs out at 2.83495 cups. Divide 2.83495 by 3.7799364 and you get back to 3/4 lb, which is the quickest check that the factor is the right way up.
1 1/2 lb of tapioca starch in cups
1 1/2 lb of tapioca starch weighs out at 5.6699 cups. Divide 5.6699 by 3.7799364 and you get back to 1 1/2 lb, which is the quickest check that the factor is the right way up.
3 lb of tapioca starch in cups
Take 3 lb of tapioca starch: 3 × 3.7799364 gives 11.3398 cups. Doubling the batch takes it to 22.6796 cups, because the relationship is a straight proportion once the density is known.
How to read your score
Frequently asked questions
How many cups are in 1 lb of tapioca starch?
One pound of tapioca starch is 3.7799364 cups. Half that quantity is 1.88997 cups and double it is 7.55987 cups, so the figure scales straight up and down — there is no offset in this conversion, only the factor.
Why is a cup of tapioca starch not 236 g like water?
Because weight per cup depends on what is in the cup. Tapioca starch has a density of 0.50721 g per mL where water has 1.00, so a cup of it weighs 120 g rather than 236.6 g. That is a difference of 116.6 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 tapioca starch by roughly 20% — about 12 g either side of 120 g — because sold as tapioca flour as well — the same thing under two names, which is worth knowing before buying both. Weighing removes the question entirely.
Is a fluid ounce of tapioca starch 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 tapioca starch weighs 0.5291 oz, so the two readings differ by 47.1%. 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 tapioca starch would weigh 126.8 g instead of 120 g — 6.8 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?
A scale, if the result matters. Volume measuring carries a spread of about 20% for tapioca starch — roughly 24 g on a 120 g cup — while a domestic scale is accurate to a gram or two. For anything where the ratio of ingredients drives the outcome, bread and pastry above all, weigh it.
How much does 2 cup of tapioca starch weigh?
2 cup of tapioca starch comes to 240 g, or 0.52911 pounds. This page runs that calculation in reverse — enter a weight and it returns the volume — and the cups-to-pounds page does it in the direction the question is usually asked.
Tapioca starch in pounds and cups
| Pounds | Cups | Unrounded |
|---|---|---|
| 1/4 lb | 0.944984 cup | 0.9449841042 |
| 1/2 lb | 1.88997 cup | 1.889968208 |
| 3/4 lb | 2.83495 cup | 2.834952313 |
| 1 lb | 3.77994 cup | 3.779936417 |
| 1 1/2 lb | 5.6699 cup | 5.669904625 |
| 2 lb | 7.55987 cup | 7.559872833 |
| 3 lb | 11.3398 cup | 11.33980925 |
| 5 lb | 18.8997 cup | 18.89968208 |
Based on 120 g per cup of tapioca starch. One pound of tapioca starch is 3.7799364 cups.
| Measure | Grams | Ounces | Millilitres |
|---|---|---|---|
| 1 cup | 120 g | 4.23 oz | 236.6 mL |
| 3/4 cup | 90 g | 3.17 oz | 177.4 mL |
| 2/3 cup | 80 g | 2.82 oz | 157.7 mL |
| 1/2 cup | 60 g | 2.12 oz | 118.3 mL |
| 1/3 cup | 40 g | 1.41 oz | 78.86 mL |
| 1/4 cup | 30 g | 1.06 oz | 59.15 mL |
| 1 tbsp | 7.5 g | 0.265 oz | 14.79 mL |
| 1 tsp | 2.5 g | 0.0882 oz | 4.929 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) |
|---|---|---|---|
| Coconut flour | 112 g | 3.951 oz | 0.4734 |
| Cake flour | 114 g | 4.021 oz | 0.4818 |
| Whole wheat flour | 120 g | 4.233 oz | 0.5072 |
| Tapioca starch (this page) | 120 g | 4.233 oz | 0.5072 |
| Powdered sugar | 120 g | 4.233 oz | 0.5072 |
| All-purpose flour | 125 g | 4.409 oz | 0.5283 |
| Self-rising flour | 125 g | 4.409 oz | 0.5283 |
Ordered by weight. The spread across this group is why a single generic cups-to-grams factor cannot work.