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I have a recipe which calls for 250g of tinned black beans.. i thought i would be smart and use some DRIED black beans i have already!

but.. obviously the dried beans will weigh less than the tinned black beans..

How can i calculate how many grams of the dried beans i would need to make 250g of cooked black beans?

I was going to soak them overnight and then boil them until theyre soft!

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This answer covers the general rule of thumb for conversion… – TFD May 17 '11 at 21:25
up vote 1 down vote accepted

250g of canned black beans is about a cup of soaked/cooked beans, which is the same as a drained 15oz/425g tin.

The volume of beans increases from 2-3x. It is probably closer to 3x for black beans but I'm not certain.

So I would cook up about 80g-90g of dry beans, I think that will get you a bit more than you need without a huge waste. 70g would probably nail it but if I'm wrong you would be short. And I'd take notes on what the weight change is for future reference :-).

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Thank you i will use this! the recipe doesnt have to be exact so im sure having a few extra beans wont matter! – alice May 20 '11 at 17:13

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