Bean Soaking Time Calculator

Soaking dried beans before cooking serves two important purposes: it rehydrates the beans (reducing cooking time significantly) and helps remove some of the oligosaccharides — complex sugars that cause digestive discomfort in many people.

Why soak beans? Dried beans are essentially dehydrated seeds. Without soaking, cooking times can be extremely long (2–3+ hours for large beans). Soaking softens the outer seed coat, begins rehydration, and allows the bean to cook more evenly.

Two soaking methods:

Overnight Soak (Traditional): Cover beans with 3× their volume in cold water. Let soak 8–12 hours (or overnight). Drain and rinse. This is the gentlest method and reduces cooking time by 25–50%. Best for most bean varieties.

Quick Soak: Place beans in a pot, cover with water, bring to a boil, boil 2 minutes, then remove from heat and let sit 1 hour. Drain and rinse. Nearly as effective as overnight soaking. Good when you forget to plan ahead.

Bean varieties and soaking times:

Cook times below are stovetop, at a simmer.

Quick soaking lands within a few minutes of the overnight column, so the calculator treats the two the same.

Important safety note: Kidney beans contain phytohaemagglutinin (PHA), a natural toxin that is destroyed only by boiling. Always boil kidney beans vigorously for at least 10 minutes before slow cooking.

Pressure cooker / Instant Pot: soaked beans run 6–15 minutes at high pressure, and the same beans from dry run 20–40. Those are minutes at pressure only. Budget another 10–15 for the pot to come up, and let the pressure fall on its own, because a fast release tears the skins off.

Slow cooker: 4–6 hours on low for soaked beans, 6–8 from dry. Chickpeas want the top of that range. One exception matters more than the rest. Dried kidney beans in a slow cooker are the classic way people give themselves food poisoning, because low never reaches boiling and the phytohaemagglutinin survives. Boil them hard for 10 minutes on the stove first, then transfer.