Normal estradiol levels in premenopausal women range from about 15 to 350 pg/mL, depending on where you are in your menstrual cycle. That’s a wide range because estrogen isn’t static. It shifts dramatically from week to week, drops after menopause, surges during pregnancy, and sits at much lower levels in men. Understanding what’s “normal” means knowing which phase of life and which phase of your cycle you’re in.
The Three Types of Estrogen
Your body makes three forms of estrogen, and they aren’t equally important at every stage of life. Estradiol (E2) is the strongest and most abundant form during the reproductive years. It drives ovulation, thickens the uterine lining for pregnancy, and supports bone density, brain function, and blood vessel health. When doctors test “estrogen levels,” they’re almost always measuring estradiol.
Estrone (E1) is a weaker form that becomes the dominant estrogen after menopause, since it’s the only type your body keeps producing naturally once the ovaries stop releasing eggs. Your body can convert estrone into estradiol when needed, but the conversion is limited. Estriol (E3), the weakest form, is primarily produced by the placenta during pregnancy and doesn’t play a major role outside of it.
Estradiol Levels Through the Menstrual Cycle
Estradiol levels follow a predictable pattern each cycle, but the swings are large. In the early follicular phase (the days right after your period starts), levels sit at their lowest, typically around 15 to 50 pg/mL. They then climb gradually over the next week or so. Two to three days before ovulation, estradiol rises sharply and peaks at 5 to 10 times the early follicular level, often reaching 150 to 350 pg/mL or higher. After ovulation, levels dip briefly, then rise again to a moderate plateau during the mid-luteal phase before dropping back down as your period approaches.
This is why a single blood draw can be misleading without context. A result of 40 pg/mL on day 3 of your cycle is perfectly normal. The same number on day 12 might signal a problem with ovulation.
Estrone Levels by Phase
Estrone follows a somewhat different pattern. During the follicular phase, normal estrone ranges from 100 to 250 pg/mL. In the luteal phase, it drops to 15 to 200 pg/mL. After menopause, estrone settles into a range of 15 to 55 pg/mL. These numbers are less commonly tested than estradiol, but they matter most in postmenopausal women, where estrone is the primary circulating estrogen.
After Menopause
Once you’ve gone 12 months without a period, estradiol levels drop significantly and generally stay below 30 pg/mL, often falling into single digits. Estrone becomes the main estrogen in circulation, though at much lower levels than estradiol reached during reproductive years. This drop is what triggers the symptoms many women experience: hot flashes, vaginal dryness, sleep disruption, and accelerated bone loss.
Estrogen Levels During Pregnancy
Pregnancy sends estradiol levels into an entirely different range. In the first trimester, levels climb to roughly 150 to 3,000 pg/mL. By the second trimester, they can reach 1,200 to 7,000 pg/mL or higher. In the third trimester, some assays measure levels above 30,000 pg/mL. These dramatic increases are driven by the placenta and are essential for supporting fetal development and preparing the body for delivery.
Normal Levels in Men
Men produce estrogen too, just in smaller amounts. Normal estrone levels in adult men range from 15 to 65 pg/mL. Estradiol levels are generally lower than those seen in premenopausal women, typically sitting well below 50 pg/mL. Estrogen in men supports bone health, brain function, and cardiovascular health. Levels that climb too high relative to testosterone can cause symptoms like breast tissue growth, fatigue, and mood changes.
Target Levels on Hormone Therapy
If you’re taking estrogen for menopausal symptoms, the clinical target for symptom relief is generally 60 to 150 pg/mL of estradiol. Research published in the journal Menopause found that levels around 60 pg/mL relieve hot flashes in about half of women and prevent bone breakdown. At around 100 pg/mL, hot flashes are essentially eliminated and bone density begins to increase. These targets help explain why dosing is often adjusted over time based on blood work and symptom response rather than set at a fixed amount.
When to Test and How to Read Results
Timing matters. If you’re still having periods and your doctor wants a baseline estradiol reading, the best window is between days 6 and 11 of your cycle (counting from the first day of your period). Research in Cancer Epidemiology, Biomarkers & Prevention found that a blood draw around day 10 correlates most reliably with your overall estrogen exposure across the full cycle. Testing during the mid-cycle surge or luteal phase captures a snapshot that may not reflect your typical levels.
Labs report estradiol in one of two units: pg/mL (common in the U.S.) or pmol/L (common internationally). To convert, multiply pg/mL by 3.676. So 100 pg/mL equals about 367 pmol/L. If your results look unexpectedly high or low, check which unit was used before drawing conclusions.
What High or Low Levels Mean
Low estrogen relative to your age and cycle phase can show up as irregular or missed periods, hot flashes, night sweats, vaginal dryness, difficulty concentrating, joint pain, and gradual bone thinning. These symptoms can begin in perimenopause, years before periods actually stop.
High estrogen, or estrogen that’s elevated relative to progesterone, is sometimes called estrogen dominance. This imbalance can result from overproduction, changes in how your body breaks down and clears estrogen, or insufficient progesterone to balance it out. Symptoms often include heavy or prolonged periods, breast tenderness, bloating, mood swings, and weight gain. Formal lab testing for the estrogen-to-progesterone ratio isn’t necessary for most women, according to the U.S. Department of Veterans Affairs. Symptoms and clinical context usually guide the evaluation.
A single estrogen number in isolation tells you very little. The same level can be perfectly healthy or clinically meaningful depending on your age, cycle timing, symptoms, and what other hormones are doing alongside it.