Blackberry converter: whole blackberries, cups, grams

You have two punnets of blackberries and a recipe is asking for cups. A metric cup (250 ml) holds about 150 g of blackberries, which is often the standard punnet size, though a punnet can range from 125 g to 150 g. Use the converter to swap between whole blackberries, cups, grams and ounces.

A large cultivated blackberry weighs close to three times a small one in the wild, so a cup can be under twenty berries or nearer fifty. Use the tool below to get the right weight or volume for your crumble, jam or compote.

How much does a blackberry weigh?

A medium, or average, blackberry weighs about 5 g, with a small one around 3 g and a large one around 8 g.

Related Blackberry Ingredients

Also need to convert blueberries? The blueberry converter can swap between a weight or volume like grams to cups. See our Blueberry converter.

Using strawberries in your dish? Use the strawberry converter to switch between cups, grams or whole strawberries. See our Strawberry converter.

Raspberries are hollow once picked, so a cup is 128 g where blackberries are 150 g. The raspberry converter can get the right weight or volume. See our Raspberry converter.

Out of blackberry? See blackberry substitutes →

Blackberry converter tool

Enter an amount, pick your units, and set the size for counting whole blackberries.

Size applies to whole blackberries (small / medium / large).

Result

30 blackberries

Blackberry Calculators & Kitchen Tools

Working with blackberry? These tools handle the jobs a converter cannot.

Common Blackberry conversions

Quick reference for blackberry at medium size. Switch the size in the converter above for small or large.

Cups (chopped)Grams
0.25 cups37.5 g
0.5 cups75 g
0.75 cups112.5 g
1 cup150 g
1.5 cups225 g
2 cups300 g
3 cups450 g

Blackberry conversion chart

The chart below shows how whole blackberries (medium size) convert to cups, grams and ounces.

cupsblackberriescups (US)goz
0.25 cups7.5 blackberries0.26 cups (US)37.5 g1.32 oz
0.5 cups15 blackberries0.52 cups (US)75 g2.65 oz
1 cup30 blackberries1.04 cups (US)150 g5.29 oz
1.5 cups45 blackberries1.56 cups (US)225 g7.94 oz
2 cups60 blackberries2.08 cups (US)300 g10.58 oz

Blackberry varieties and best uses

The conversions above are the same whatever variety you use; the difference is what each is good for. Here is how the common blackberry varieties compare.

VarietyBest for
Triple CrownFresh eating and crumbles: large, sweet, thornless, the cultivated standard.
Marion (Marionberry)Jam and pies: deep, complex, slightly tart flavour with soft flesh.
ChesterFreezing and baking: firm, late-cropping, keeps its shape when cooked.
BoysenberryPreserves and desserts: a large soft hybrid with a deep winey flavour.
Loch NessFresh eating and garden crops: thornless UK favourite that crops heavily.
Wild (Bramble)Jelly and hedgerow jam: tiny, seedy, and the sharpest in flavour.

Which should I pick?

Most of the time when you visit a supermarket you will only be offered a generic “blackberry”, so you won't have a lot of choice. Depending on where you live, you may be able to grow different varieties. Triple Crown is thornless and easiest to cultivate. Large and sweet, they suit crumbles and a fresh snack. Chester is firmer, so it can hold its shape when freezing or baking. Wild berries can give you a sharper taste in your jam.

In my kitchen

Blackberries are usually a fresh fruit we have in the fridge at home for snacking on when they are in season. It is probably a less popular jam in the cupboard, behind raspberry, strawberry and marmalade. As a kid I did enjoy picking them during our holidays, where the property we stayed in was surrounded by wild blackberry bushes, and we used strips of corrugated iron to access the fruit without getting cut up by the thorns too much.

Notes from Ian, Cooking Converter

Frequently Asked Questions

What is the size of a medium blackberry?
A medium blackberry weighs about 5 g, which works out to roughly 0.03 cups (0.03 US cups) of chopped flesh. Blackberries come in a range of sizes depending on the season, variety and where they were grown, so weight and cup figures shift accordingly. Use the size selector above to match what you actually have, then read the exact conversion for any amount.
How much does a medium blackberry weigh?
A medium blackberry weighs about 5 g, with a small one around 3 g and a large one near 8 g. That range changes the weight of any recipe that counts blackberries by the piece, so set the size selector to match what you actually have before trusting a cup or gram figure.
How much does an average blackberry weigh?
An average blackberry is the same as a medium one: about 5 g. A small blackberry is lighter at around 3 g and a large one heavier at about 8 g, so the size you actually have changes the total for any recipe that counts blackberries by the piece rather than by weight.
How much does a large blackberry weigh?
A large blackberry weighs about 8 g, noticeably more than a medium, or average, one at 5 g or a small one at 3 g. Set the size selector to large to convert cups, grams and ounces for the bigger blackberries you actually have on the counter.
Which blackberry variety should I use?
Most of the time when you visit a supermarket you will only be offered a generic “blackberry”, so you won't have a lot of choice. Depending on where you live, you may be able to grow different varieties. Triple Crown is thornless and easiest to cultivate. Large and sweet, they suit crumbles and a fresh snack. Chester is firmer, so it can hold its shape when freezing or baking. Wild berries can give you a sharper taste in your jam.
How do I convert grams to ounces for any ingredient?
Converting grams to ounces is pure weight maths that applies to any food, not just blackberries, so 50 grams is always 1.76 ounces. For other amounts, the weight converter at the link below handles grams, ounces, pounds, kilograms and stone in both directions. Grams to ounces converter

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