The average volume of menstrual blood is only between 3-8 tablespoons for your entire period. During their period, they may have some light days when they’re barely bleeding at all, and then some days where their bleeding is heavier. Their period flow (volume) is the amount of blood that comes out, and the easiest way to measure it is by noting how often they need to change your period products. Their flow may be light, regular, heavy, or very heavy. They’ll probably need to change your pad, tampon, or menstrual cup about 3–6 times a day. For more information about your period flow, visit BLOOM’s Signs of Your Cycle Page.