what percent of the blood is hemoglobin
Someone else already gave the normal lab values for hemoglobin in g/dL, which is how hemoglobin amounts are typically measured. But in the spirit of the asked question, I calculated the percentages for you. Hemoglobin makes up around 33% of the total red blood cell (RBC), if you include the water content of the cells. If you're a woman, RBCs should be 37-48% of your total blood volume. For guys, it should be 45-52%. We call this value the hematocrit.