Women typically lose about 30 to 60 milliliters (approximately 2 to 4 tablespoons) of blood during their period. This amount can vary widely, with an average around 35 to 40 milliliters, but some sources suggest it can be closer to 60 milliliters, roughly one and a half shot glasses full
. Menstrual fluid is not just blood; it also contains tissue, uterine lining, mucus, and blood clots. Blood makes up about 36% to 50% of the total menstrual fluid volume, so the total fluid lost is higher than the actual blood loss
. Bleeding is considered heavy (menorrhagia) if blood loss exceeds about 80 milliliters per period. Heavy bleeding may require medical attention, especially if it interferes with daily life or causes symptoms like fatigue or anemia
. In summary:
- Typical blood loss: 30–60 ml per period (2–4 tablespoons)
- Total menstrual fluid includes blood plus other materials
- Heavy bleeding: over 80 ml blood loss per period
This range reflects normal variation among individuals and can change due to factors like hormonal contraception, pregnancy, or health conditions
