Cups of tapioca starch to pounds runs on one number, 0.26455471 pounds per cup. 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.
Put next to water — 1 g per mL exactly — tapioca starch measures 0.50721 g per mL. That ratio, 50.72%, is what separates this page from every other ingredient in the same units, and it is measured rather than defined.
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.
How the figure is arrived at: Sold as tapioca flour as well — the same thing under two names, which is worth knowing before buying both.
The formula
cups- The amount of tapioca starch you are converting, in cups
0.264554714622- Pounds per cup for tapioca starch, from its density of 0.50721 g/mL
pounds- The equivalent quantity in pounds
How it works, step by step
- Enter the quantity in cups.
- It is multiplied by 0.264554714622, the pounds-per-cup figure for tapioca starch.
- The result appears in pounds, with a second reading in g beneath it.
- Use the measure table if you want a standard recipe quantity rather than a number you type in.
Worked examples
1/3 cup of tapioca starch in pounds
A recipe calling for 1/3 cup of tapioca starch needs 0.0881849 pounds on the scale. The arithmetic is 0.333333 × 0.26455471 = 0.088184905, and halving the recipe halves the weight to 0.0440925 pounds.
3/4 cup of tapioca starch in pounds
Take 3/4 cup of tapioca starch: 0.75 × 0.26455471 gives 0.198416 pounds. Doubling the batch takes it to 0.396832 pounds, because the relationship is a straight proportion once the density is known.
3 cup of tapioca starch in pounds
3 cup of tapioca starch weighs out at 0.793664 pounds. Divide 0.793664 by 0.26455471 and you get back to 3 cup, which is the quickest check that the factor is the right way up.
How to read your score
Frequently asked questions
How many pounds are in 1 cup of tapioca starch?
One cup of tapioca starch is 0.26455471 pounds. Half that quantity is 0.132277 pounds and double it is 0.529109 pounds, 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 many cups of tapioca starch is 1 lb?
1 lb of tapioca starch is 3.7799 cups — 3.77994 cups to one pound, so 1 × 3.77994 = 3.7799. Going that way is a division by 0.264555, or a multiplication by 3.77994 if you prefer.
Tapioca starch in cups and pounds
| Cups | Pounds | Unrounded |
|---|---|---|
| 1/8 cup | 0.0330693 lb | 0.03306933933 |
| 1/4 cup | 0.0661387 lb | 0.06613867866 |
| 1/3 cup | 0.0881849 lb | 0.08818490487 |
| 1/2 cup | 0.132277 lb | 0.1322773573 |
| 2/3 cup | 0.17637 lb | 0.1763698097 |
| 3/4 cup | 0.198416 lb | 0.198416036 |
| 1 cup | 0.264555 lb | 0.2645547146 |
| 1 1/2 cup | 0.396832 lb | 0.3968320719 |
| 2 cup | 0.529109 lb | 0.5291094292 |
| 3 cup | 0.793664 lb | 0.7936641439 |
| 4 cup | 1.05822 lb | 1.058218858 |
Based on 120 g per cup of tapioca starch. One cup of tapioca starch is 0.26455471 pounds.
| 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.