Produce high in calcium includes broccoli, collard greens, figs, kale and soybeans. Seafood, notably sardines, salmon and shrimp also offer a substantial amount of calcium, while ricotta cheese, yogurt and milk top the list of calcium-rich dairy products. Many foods, including almond milk, orange juice, tofu, waffles and oatmeal are fortified with calcium as well.
An average 8-ounce serving of frozen collard greens provides 360 milligrams of calcium, while the same serving size of broccoli rabe offers 200 milligrams. Frozen kale contains 180 milligrams per serving, and an equivalent portion of soybeans delivers 175 milligrams of calcium. Though offering less calcium per serving than collard greens, a 3-ounce portion of canned sardines brings 325 milligrams of calcium, a 3-ounce serving of canned salmon features 180 milligrams and the same portion of canned shrimp has 125 milligrams of calcium.
While dairy products are notorious for being high in calcium, the amounts are comparable to other products. Four ounces of part-skim ricotta cheese brings 335 milligrams of calcium, 6 ounces of plain, low-fat yogurt contains 310 milligrams of calcium, and 8 ounces of cow's milk has 300 milligrams of calcium. One ounce of mozzarella or cheddar cheese provides 205 to 210 milligrams of calcium, and 8 ounces of vanilla ice cream offers 85 milligrams of calcium.