It is probable that people who consume diets that are low in sodium and moderate in protein and who exercise regularly have lower calcium needs than those who eat copious amounts of protein and salt and lead a couch-potato lifestyle. But in terms of general recommendations, we can't conclude that vegetarians as a group need less calcium than omnivores. Pending a better understanding of calcium needs of all groups, vegetarians should aim to meet the current calcium recommendation for their age group. Clearly, however, bone health is not a one-nutrient issue. All the calcium in the world will not do you much good if you don't exercise, don't get adequate vitamin D, eat too much salt, and have a diet that is generally unbalanced.
Calcium is important, but it's only one of many important factors.
Meeting Calcium Needs Make the most of your food choices. Choose calcium-fortified soymilk, rice milk, and orange juice over the unfortified brands. And look for ways to incorporate other sources of calcium into your diet as well. Toss raw greens like kale with onions and garlic sauteed in olive oil and with just a pinch of cinnamon. Then cook them in a small amount of vegetable broth until tender.