I've got four cups of dry pinto beans. What will be their volume after I let them soak overnight?

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Typically dry beans expand 2-3 times their original volume when soaked, depending on their age (fresher beans have more moisture left than older ones and expand less). I usually put them in a large pot and cover them with at least 5-6cm of water above.

It's closer to 3 to 4 times. I actually measured mine, I make 6 pounds at a time and they swelled up (after cooking and draining leftover water) about 3.5 times.

Here is an image of a dry pinto bean next to a pinto bean that I soaked for 8 hours. You can see that the soaked bean is about 3.5 times the size of the dry bean. 4 cups of dry beans will turn into ~12 cups of soaked beans.

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I quick soaked 1 cup of black beans and wound up with almost 5 cups of them.

I measured by volume, not weight. 3/4 cup of navy beans came out to just over 1 3/4 cups after cooking. After soaking them overnight, they were just about doubled. After cooking they were roughly 2.5 times the dried volume.

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