the amount of elements may vary from person to person however based on analysis, averages and trends the composition of human body is like it mainly contains about 60% of oxygen by mass, 23% of carbon by mass, 10% hydrogen,2.5% nitrogen and then near by 1.4-1.5% of calcium
Thus if a man is weighing 60kg then the approximate or expected amount of calcium will be :
1.4% X 60kg = 0.84 kg
We may say that it will have 800-900 grams of calcium in its body.