1 Cup Dry Red Kidney Beans (185g) = 2 ½ cups Cooked
1 US cup (185 grams) of uncooked red kidney beans yields 2 ½ cups (444 grams) cooked after standard stove-top preparation in water or broth—a verified 2.5× volume expansion and 2.4× weight multiplier providing roughly 3.4 standard cooked servings.
Must be soaked and boiled vigorously for at least 10 minutes to destroy phytohaemagglutinin toxin, then simmered gently for 60–75 minutes until tender.
Canned equivalence: One standard 15-oz (425g) can drained yields ~1.5 cups (255g) cooked kidney beans, equivalent to ~0.57 cups (106g) dried kidney beans.
Method note: Must be soaked and boiled vigorously for at least 10 minutes to destroy phytohaemagglutinin toxin, then simmered gently for 60–75 minutes until tender. One standard 15-oz (425g) can drained yields ~1.5 cups (255g) cooked kidney beans, equivalent to ~0.57 cups (106g) dried kidney beans.
Dried Red Kidney Beans Batch Yield Reference Chart
| Uncooked (dry) | Uncooked Grams | Cooked Volume | Cooked Weight | Est. Servings |
|---|---|---|---|---|
| ½ cup | 92.5 g | 1 ¼ cups | 222 g (7.83 oz) | ~1.7 |
| 1 cup | 185 g | 2 ½ cups | 444 g (15.66 oz) | ~3.4 |
| 1 ½ cups | 277.5 g | 3 ¾ cups | 666 g (23.49 oz) | ~5.1 |
| 2 cups | 370 g | 5 cups + ¾ tsp | 888 g (31.32 oz) | ~6.8 |
| 3 cups | 555 g | 7 ½ cups + 1 ¼ tsp | 1332 g (46.98 oz) | ~10.2 |
Frequently Asked Questions
Why must dry red kidney beans be boiled vigorously? ▾
Raw kidney beans contain high concentrations of the natural lectin phytohaemagglutinin; boiling for at least 10 minutes completely destroys this compound safely.
How many cups cooked kidney beans does 1 cup dry make? ▾
1 cup (185g) dry kidney beans expands to yield about 2.5 cups (~444g) of cooked beans, enough for a large pot of chili.