An adult who weighs 75 kg, so is targeting about 75 grams of protein intake per day, would only need to eat 833 grams of cooked chickpeas (which are 9% protein by weight) to get there. That is indeed a lot of chickpeas! But a lot less than you claimed, and you probably shouldn't be getting all your protein from chickpeas anyway.
You're probably talking about dry weight. My can says 6g protein / 130 g. I'm about 100kg and to hit the 1.6 g protein/kg I need 160g of protein. 6g/130g * 3500 g is 161 g of protein.
Two numbers from the USDA:
- Canned, drained and rinsed: 7g protein / 100g [1]
- Boiled: 9g protein / 100g [2]
Not sure what explains the discrepancy (though the second number is much older), but both are considerably higher than what your can says. Sure you aren't reading a per-serving amount?
[1]: https://fdc.nal.usda.gov/food-details/2644288/nutrients
Nope, here's the can:
https://www.kroger.com/p/kroger-garbanzo-beans/0001111010648
It was definitely eye opening on the sort of ancient benefit of meat. It's really hard to reach your muscular potential without it.