A 15 oz can of black beans holds about 1 1/2 cups drained. Like chickpeas, black beans are sold by total weight — 425 g for the can — and a significant part of that is the dark packing liquid, which most recipes tell you to drain away. What is left after draining and rinsing is about 1 1/2 cups of beans, and that is the number recipes are written around. A burrito recipe calling for two cans expects 3 cups of beans; a soup for four expects one can; a taco filling for six expects two. Get the drained yield right and the rest of the recipe falls into place.
Black beans are a staple of Mexican and Southwestern cooking, and they are also one of the cheapest sources of protein in the supermarket. The 1 1/2 cup figure is worth memorising because it comes up constantly: tacos, burrito bowls, quesadillas, soups, chilli, salads and dips all measure black beans by the can, and the can is always the same size. If you are meal-prepping, two cans give you 3 cups, which is enough for a week of lunches across tacos, bowls and salads — cook once, eat four times.
Can of black beans conversion table
The table below shows the drained yield for fractions of a can and for multiple cans. Measure after draining and rinsing, which is how recipes expect the beans to be used.
| Amount | Cups (approx.) | Tablespoons | Fluid ounces |
|---|---|---|---|
| 1/4 can | 0.38 cups (about 3/8 cup) | 6.0 tbsp | 3.0 fl oz |
| 1/2 can | 0.75 cups (about 3/4 cup) | 12.0 tbsp | 6.0 fl oz |
| 3/4 can | 1.12 cups (about 1 1/8 cups) | 18.0 tbsp | 9.0 fl oz |
| Full can | 1.50 cups (about 1 1/2 cups) | 24.0 tbsp | 12.0 fl oz |
| 2 cans | 3.00 cups | 48.0 tbsp | 24.0 fl oz |
The can weighs 425 g in total (15 oz), including the packing liquid. The drained beans weigh less, and the exact drained weight varies by brand, so measure by volume after draining. Black beans are not in the ingredient density table, so no grams-per-cup figure is published here.
Worked examples
Taco filling for six
A taco filling for six people uses two cans of black beans — 3 cups drained — sautéed with onion, garlic, cumin, smoked paprika and a squeeze of lime. Drain and rinse both cans, then fry the onion and garlic in oil for three minutes, add the spices and cook for thirty seconds until fragrant, then add the beans and a splash of water and mash about a third of them against the pan. The mashed beans bind the filling together so it stays in the taco instead of falling out. Two cans fill about twelve tacos, with lime, coriander and sour cream on top.
A burrito bowl for four
A burrito bowl for four people uses one can of black beans — 1 1/2 cups drained — over rice, with corn, avocado, tomato salsa and a dollop of sour cream. Warm the beans in a small pan with a pinch of cumin and a little of their own cooking water, or just heat them plain if you are in a hurry. One can is the right amount for four bowls as part of a spread; if beans are the main protein and there is nothing else substantial, use two cans and let people take more.
Black bean soup for a crowd
A black bean soup for eight people calls for 3 cups of drained beans — two cans — simmered with onion, garlic, cumin, oregano and vegetable stock, then partly blended. Use both cans, drained and rinsed, and add them after the onion has softened. Simmer for twenty minutes, then blend about half the soup and stir it back in for a thick, creamy texture without any cream. Serve with lime wedges and a swirl of sour cream. The soup freezes well, so make a double batch and freeze half in portions.
How the figure is worked out
Think of the answer as a conversion, not a measurement. The package weight is a standard 15 oz can of black beans, drained and rinsed. One cup of this ingredient weighs a known number of grams, so the cups in the package are the package weight divided by the cup weight. The method matters as much as the number: a spooned and levelled cup is the standard, and a scooped cup packs in more, which is why two bakers can get different cup counts from the same bag.
Practical guidance
Always drain and rinse black beans before using them, unless the recipe specifically says to use the liquid. The packing liquid is very dark and starchy, and it will turn a soup murky, stain rice grey, and add salt you did not plan for. Rinse under cold water until the water runs clear — about thirty seconds in a colander. The exception is a chilli or a soup where you want the starch to thicken the pot; even then, rinse half the beans and use the liquid from the other half, so you get the thickening without the murk.
Black beans are not in the ingredient density table, so there is no grams-per-cup figure for them — measure by volume after draining. Check the label: most canned black beans contain salt, and rinsing removes a good part of it. Low-sodium cans exist and are worth buying if you cook with beans often. Store leftovers in a sealed container in the fridge for three to four days, or freeze them in a bag for up to three months. Frozen beans go straight into a hot pan or pot without thawing, which makes them ideal for meal prep.
Frequently asked questions
How many grams are in a can of black beans?
The can weighs 425 g in total, including the packing liquid. The drained beans weigh less, and the exact drained weight is not a published standard — it varies by brand and by how much liquid the brand packs. Measure drained beans by volume (1 1/2 cups per can) rather than by weight.
Should I rinse canned black beans?
Yes, almost always. Rinsing removes the dark, starchy, salty packing liquid and gives you cleaner-tasting beans that will not discolour your dish. The only exception is a chilli or soup where you want the starch for thickening — and even then, rinse at least half the beans.
Can I use black beans instead of chickpeas?
In many dishes, yes — they are both about 1 1/2 cups drained per 15 oz can, so the volume swaps directly. The flavour and texture differ: black beans are softer and earthier, chickpeas are firmer and nuttier. In a salad or a curry the swap works; in hummus it does not, because the texture and flavour are wrong.
How many cans of black beans do I need for chilli?
A chilli for four people usually needs one can (1 1/2 cups drained) alongside the mince and tomatoes. A chilli for eight needs two cans (3 cups). If the chilli is vegetarian and beans are the main protein, add an extra can — three cans for eight people — and reduce the other vegetables slightly so the pot is not overfull.
How long do opened canned black beans keep?
Three to four days in the fridge in a sealed container, or up to three months in the freezer. Transfer them out of the can as soon as you open it, and rinse before storing. Frozen beans can be added straight to a hot dish without thawing.