A cup of blueberries is 170 g — the King Arthur Baking figure, measured spooned and levelled. Small, sweet blue berries. It is used for muffins, pancakes, salads and snacking. They are one of the heaviest fruits per cup at 170 g, and the number comes with a warning: King Arthur gives a range of 140 to 170 g, because berry size changes everything, and a cup of small wild blueberries packs far more weight than a cup of large, plump ones. This guide covers the weight of blueberries in every measure you will use — cups, tablespoons and teaspoons — how to measure it correctly, what to use instead when you run out, and how to store it. All weights on this page are approximate; verify with a kitchen scale when the recipe matters.
Blueberries: weight and measurement table
The table below gives the weight of Blueberries in every measure you will use, from a teaspoon up to 2 cups, all derived from the King Arthur Baking figure of 170 g per cup, spooned and levelled. Every figure is approximate — spooned and levelled is a technique, not a machine setting — so when the recipe matters, weigh the ingredient on a kitchen scale instead.
| Amount | Weight (approx.) |
|---|---|
| 1 teaspoon | 3.5 g |
| 1 tablespoon | 10.6 g |
| 1/4 cup (4 tbsp) | 42.5 g |
| 1/3 cup | 56.7 g |
| 1/2 cup (8 tbsp) | 85 g |
| 3/4 cup (12 tbsp) | 127.5 g |
| 1 cup (16 tbsp) | 170 g |
| 2 cups | 340 g |
| 100 g | 0.59 cups |
There are 3 teaspoons in a tablespoon and 16 tablespoons in a cup, so you can move between any of these measures by multiplying or dividing. If a recipe calls for 100 g and you only have measuring cups, that is about 0.59 cups. Keep the cups to grams converter open while you cook and you will never need to do the arithmetic in your head.
What is Blueberries?
Small, sweet blue berries. Blueberries is used for muffins, pancakes, salads and snacking. The ingredient is a familiar one in most kitchens, but it is worth knowing what it actually is before you measure it, because the form it comes in decides how it behaves in a recipe. Blueberries as sold is the form the weight on this page refers to: 170 g per cup, spooned and levelled, from King Arthur Baking. If you buy it in a different form — chopped, ground, toasted, sweetened or unsweetened — the weight per cup changes, sometimes by a lot, so weigh the ingredient in the form the recipe asks for, or weigh it before you change its form. That single habit, weighing before chopping, grinding or toasting, is what keeps the recipe consistent from one bake to the next.
How to measure Blueberries
Spoon the blueberries lightly into the measuring cup or spoon, then level the top with the back of a knife. Do not scoop the measure straight from the bag or the jar, because scooping packs the ingredient down and adds weight with every spoonful. Do not press it down or shake the measure to settle it, because that packs it too. The spooned and levelled method is a technique, not a machine setting, so two people measuring the same ingredient can still differ by a few grams, which is why the figures on this page are approximate. When the recipe matters, weigh the blueberries on a kitchen scale instead: put the bowl on the scale, press tare, and add the blueberries until the scale reads the weight you need.
How to store Blueberries
Refrigerate unwashed; use within 1 week. That storage advice is worth following, because blueberries goes stale faster than most cooks expect, and stale blueberries will spoil a whole batch of baking. Keep it sealed, because air and moisture are what make it go stale, and keep it away from strong smells, because it absorbs odours from the cupboard. Check the ingredient before you use it: smell it, taste a little, and look at it. If it smells sharp, stale or off, or if it has changed colour or texture, replace it rather than risking a recipe on it. A small amount of fresh blueberries is always better than a large amount of stale blueberries, and the cost of replacing it is far less than the cost of a ruined bake.
What to use instead of Blueberries
If you run out of blueberries, the closest swaps are Raspberries at 123 g per cup, Strawberries at 152 g per cup. Swap by weight, not by volume, because the cup weights differ, and a volume swap gives the wrong amount. Each substitute changes the flavour a little, so choose the one that suits the dish: a mild substitute for a delicate bake, and a stronger one where the flavour can carry it. Taste the finished dish before serving, because a substitute that works in a salad may not work in a cake, and the other way round.
Worked examples: Blueberries in real recipes
1. A batch of blueberry muffins
A batch of twelve blueberry muffins uses 12 tablespoons of blueberries, about 127.5 g, folded gently into the batter at the very end. The berries should be spread evenly through the muffins, not sunk to the bottom or burst into purple streaks, and the weight is what decides that: too many berries and the muffins fall apart, too few and they taste of plain sponge. Toss the berries in a spoonful of flour before folding them in, which stops them sinking, and fill the muffin cases only two-thirds full so the berries have room to expand.
2. Blueberry pancakes for a weekend breakfast
A stack of blueberry pancakes for four uses 10 tablespoons of blueberries, about 106.2 g, dropped onto each pancake as it cooks rather than stirred into the batter. Dropping them on top keeps the batter pale and the berries whole, while stirring them in bursts the berries and turns the pancakes grey. Cook the pancakes over a medium heat so the berries soften without burning, and serve them with a little maple syrup, because the berries are sweet enough on their own.
3. A blueberry and spinach salad
A summer salad of spinach, blueberries and feta uses 8 tablespoons of blueberries, about 85 g, scattered over the leaves just before serving. The berries add sweetness and colour that balance the salty feta and the earthy spinach, and their weight matters because too many berries make the salad taste like a fruit bowl. Scatter them at the end and dress the salad lightly, because a heavy dressing crushes the berries and stains the leaves.
Why the weight of Blueberries matters
Blueberries matter by weight because the cup is a poor measure for a round fruit. Berries leave air gaps between them, and the size of the gap depends on the size of the berry: small berries pack tightly and weigh more, large berries leave bigger gaps and weigh less. King Arthur gives a range of 140 to 170 g per cup for this reason, and we use the top of the range, 170 g, which suits the large cultivated berries most shops sell. In a muffin batter, the blueberry content decides whether the muffins are studded with fruit or barely flavoured, and a 30 g error is the difference between the two. Weighing the berries is the only way to get the same muffins twice, and it also helps with cost, because blueberries are expensive and a recipe that says two cups can hide a wide range of actual amounts.
The King Arthur Baking figure, and how it was measured
King Arthur gives a range of 140-170 g per cup for fresh blueberries; we use the top of the range, 170 g. The figure on this page, 170 g per cup, was measured spooned and levelled, which is the standard method for this kind of ingredient. If you measure it differently — scooping instead of spooning, packing instead of levelling, or measuring after chopping — the weight changes, and the recipe changes with it. The source matters too: King Arthur Baking is the reference used throughout this site, because its figures are consistent and widely used in baking, and the USDA figures are used where King Arthur does not publish one. When two sources disagree, this site says so, and the figure given is the one judged most reliable for everyday cooking.
Common mistakes with Blueberries
The most common mistake is washing blueberries and then measuring them by volume: wet berries stick together and pack differently, and the water adds weight. Wash them, dry them well, then weigh them. The second mistake is stirring fresh blueberries into a batter roughly, which bursts them and turns the whole batter purple. Fold them in gently at the end, and toss them in a spoonful of flour first so they do not sink to the bottom. The third mistake is using frozen blueberries straight from the freezer in a muffin batter without adjusting: frozen berries release water as they bake and can make the muffins soggy. Use them frozen but add a few extra minutes to the baking time. Finally, do not store blueberries washed in the fridge, because the moisture makes them go soft and mouldy faster; wash them just before use.
Frequently asked questions
How many grams is 1 cup of blueberries?
One cup of fresh blueberries weighs about 170 g, spooned and levelled, using the King Arthur Baking figure. King Arthur gives a range of 140 to 170 g per cup, because small berries pack more tightly than large ones, and we use the top of the range, which suits the large cultivated berries most shops sell. The figure is approximate, so verify with a kitchen scale when the recipe matters.
How many tablespoons is 100 grams of blueberries?
100 grams of blueberries is about 9.4 tablespoons, spooned and levelled, because one tablespoon weighs about 10.6 g. Nine level tablespoons is just under 100 g, so add a few more berries, or weigh them on a scale, which is easier and more accurate for a round fruit.
Should I use fresh or frozen blueberries in muffins?
Both work, but they behave differently. Fresh blueberries hold their shape and give a cleaner flavour, while frozen ones release water as they bake and can make the muffins soggy. If you use frozen berries, do not thaw them first, and add a few extra minutes to the baking time. Either way, toss the berries in flour before folding them in, so they do not sink.
Why do my blueberries sink to the bottom of muffins?
Because they are heavy and the batter is thin. The fix is to toss the berries in a spoonful of flour before folding them in, which gives them grip, and to fill the muffin cases only two-thirds full. A thicker batter also helps, so do not over-mix the batter and thin it out.
How should I store blueberries?
Refrigerate them unwashed and use them within 1 week. Washing them before storage adds moisture that makes them go soft and mouldy faster. Pick out any soft or mouldy berries as soon as you see them, because one bad berry spoils the rest of the punnet.