Normal estrogen levels in women. Estrogen levels vary in women not only throughout their cycle but also through their lifetime. So, to answer the question what are normal estrogen levels in women, one has to take into account age, whether or not they are cycling and where they are in their cycle. Estrogen levels can also vary by lab as some measure it differently.  

The estrogen level that is most widely measured is estradiol and this is the strongest estrogen that builds bone, promotes growth of the uterine lining and relieves most symptoms of menopause. There is a conversion factor for labs that use different measures. In the United States we use pg/ml . To convert to pmol/L use the following formula:
Estradiol: pg/mL x 3.676 = pmol/L

Teens

The average age of puberty is 10 and cycles are beginning to become established. By age 18 most have established cycles and normal estrogen levels of women age 18 and above range from 15-350 pg/mL

Cycling Adult Women Pre Menopausal Women

Normal estrogen levels in women who are cycling vary widely throughout the menstrual cycle. Symptoms of estrogen dominance such as anxiety, irritability, insomnia, heavy periods, fluid retention, breast tenderness, weight gain and mood swings may occur if estrogen is not balanced with progesterone. Estrogen is the hormone of energy and growth and varies during a menstrual cycle.  

• Mid-follicular phase is the phase that is after a period and before ovulation and estrogen levels begin to rise to 27-123 pg/mL
• Periovulatory is around the time of ovulation when estrogen levels peak to about 96-436 pg/mL
• Mid-luteal phase is after ovulation when estrogen levels start to drop to 49-294 pg/mL
• Postmenses is after a period: 0-40 pg/mL

Menopause

Menopause is defined as cessation of period for a year and generally occurs between the ages of 45-55. Some women have mild to severe symptoms such as hot flashes, night sweats, moodiness, irritability, dry eye, skin and vagina, sagging and wrinkling of skin, weight gain, and forgetfulness among other things. Symptoms can last for up to 10 years.

• Normal estrogen levels in women in menopause is under 10 pg/ml and this may bring on all of the symptoms of menopause in some women but not all.

Estrogen levels affect fertility and cycling, however it is the balance of estrogen with progesterone that may be causing PMS type symptoms in pre teen and peri menopausal women. In menopausal women when both estrogen and progesterone are low, symptoms of both hormones being low occur.  Premature ovarian failure can occur and polycystic ovarian syndrome will interfere with ovulation and cycling. It is important for you to know your levels if you experience symptoms or have light, heavy, irregular or absent periods. Have your levels checked and see a anti aging, functional medicine doctor for natural ways to balance hormones.