How Many Blueberries Are in a Cup?
5 min read · Published August 5, 2026
The short answer is about 100 — but the number moves a lot depending on what kind of berry you bought and whether it is frozen.
A US cup of fresh cultivated blueberries holds roughly 100 berries and weighs about 148 grams, or 5.2 ounces. If you only needed one number, that is the one.
But that figure hides a surprising amount of variation, and if you are scaling a recipe up or costing out a harvest, the variation is the part that matters.
Why it is not just volume divided by berry size
The intuitive approach is to divide the volume of a cup by the volume of one berry. A US cup is 236.6 mL and a median blueberry is about 1.07 cm³, which suggests roughly 221 berries per cup.
That answer is wrong by more than double, because berries are spheres and spheres do not tile. Pour any quantity of equal spheres into a container and they settle into what physicists call random close packing, occupying about 64% of the available space. The remaining 36% is air in the gaps.
Apply that correction and you get roughly 151 mL of actual fruit in a cup, which lands at about 100 to 141 berries depending on berry size. Our median berry converter does this arithmetic for you.
One cup of fresh cultivated blueberries is about 100 berries and 148 g. One pint is about 2 cups. One pound is about 3 cups, or roughly 300 berries.
Cultivated versus wild changes everything
Almost every published figure, including ours, assumes cultivated highbush blueberries — the large ones sold in plastic clamshells. Wild lowbush berries are dramatically smaller, commonly around 40% less volume per berry.
That means a cup of wild blueberries can contain 200 or more individual berries at a similar total weight. If a recipe was written for wild berries and you use cultivated ones by count, you will add far too much fruit.
| Measure | Cultivated (approx.) | Weight |
|---|---|---|
| 1 cup | 100 berries | 148 g / 5.2 oz |
| 1 pint | 200 berries | 296 g / 10.4 oz |
| 1 pound | 300 berries | 454 g / 16 oz |
| 1 quart | 400 berries | 592 g / 20.9 oz |
Frozen berries measure differently
Water expands roughly 9% when it freezes, and a blueberry is about 84% water. Frozen berries are therefore slightly larger and, more importantly, they do not settle the same way — ice crystals on the surface make them cling instead of flowing into gaps.
In practice a cup of frozen blueberries holds a few percent fewer berries than a cup of fresh. For baking this rarely matters. For anything where you are counting, measure frozen fruit by weight instead of volume.
How to measure accurately
- Use a kitchen scale if you have one. Weight ignores packing entirely and is the only truly reliable method.
- If measuring by volume, spoon berries into the cup rather than scooping. Scooping compacts them and overfills by up to 10%.
- Do not level the top with a knife the way you would with flour. You will crush fruit and change the measure.
- For frozen berries, do not thaw before measuring. Thawed fruit collapses and packs far denser.
Does the precision actually matter?
For most baking, no. A muffin batter tolerates a quarter cup either way without complaint. Where it does matter is in pie and preserves, because both depend on the ratio of fruit to thickener.
Too much fruit in a pie and the filling floods when you cut it; too little and the crust caves. If you are sizing a pie, the pie dish calculator works from your actual dish dimensions, and our classic blueberry pie lists both cups and berry counts.
The full set of constants behind these figures, and their limitations, is documented on our methodology page.
Recipes using this
- Bakery-Style Blueberry Muffins — 12 muffins
- Classic Blueberry Pie — One 9-inch pie · serves 8