how much do girls bleed on their periods?
<answer> 60 milliliters per one period. <context> Although it can feel like a lot more at times, the total amount of blood lost during one period is usually about 60 milliliters (about 2.7 ounces). That's about a third of a small plastic cup. At that rate of bleeding, it takes about 4 hours for a regular tampon or pad to become fully soaked. That is just an average, though: menstrual flow is usually heavier on some days than on others. Doctors consider a woman to have menorrhagia if she regularly loses more than 80 ml of blood during one menstrual period.