Estrogen Level Calculator — evidence-based tool to check your estrogen level. Includes formula, tips, and interpretation guide.
Informational only — not a diagnosis. The Estrogen Level Calculator is an educational tool for a reported estradiol result. It does not diagnose, rule out, or treat a condition, and it should not be used to start, stop, or change medicine. For related context, see Creatinine Clearance Calculator and BMI Calculator.
Use the page only with the units and context shown beside each field. cycle day, an optional usual cycle length, optional cycle day 1 and collection dates, a documented assay/reference-interval choice, a postmenopausal or adult-male context when relevant, and estradiol in pg/mL or pmol/L are not interchangeable with a different specimen, collection time, assay, device, or population. Preserve the date and original laboratory report, because an apparently precise comparison can still be wrong when a reference interval or method has changed.
Estradiol is not constant across a menstrual cycle and can change with pregnancy, menopause, medicines, ovarian or testicular function, and the assay platform. A single number cannot establish ovulation, fertility, menopause, or a diagnosis. Count cycle day 1 as the first day of bleeding and enter the collection date when known. Usual cycle length is optional; blank uses a 28-day guide. Do not assume ovulation occurs on day 14: shorter, longer, or irregular cycles shift the suggested window. The estimate is a planning aid, not an ovulation detector. If cycle dates are missing, choose the cycle day or phase manually. Calendar guidance may be unreliable or inapplicable in pregnancy or with hormonal contraception. Match the context and original report; assay, specimen timing, hormone therapy, and medicines change results. Specialist interpretation matters during pregnancy, puberty, hormone therapy, and cancer treatment. A qualified clinician should interpret an abnormal, unexpected, urgent, or personally concerning result with the symptoms, history, examination, medicines, and the laboratory's own range.
For cycling, use a valid usual cycle length or a 28-day guide when blank; estimate ovulation about 14 days before the next period and classify results as follicular, ovulatory, or luteal. Select the documented Labcorp Roche ECLIA or Mayo LC-MS/MS interval that matches the report. Convert between pg/mL and pmol/L using estradiol molecular weight 272.38 g/mol (1 pg/mL = 3.671 pmol/L), then compare with the selected interval. The selector offers two cited methods. Labcorp Roche ECLIA reports follicular phase 12.5–166.0, ovulation 85.8–498.0, and luteal phase 43.8–211.0 pg/mL, with postmenopausal 0–10 and adult-male 10–40 pg/mL. Mayo LC-MS/MS reports 15–350 pg/mL for premenopausal adults, <10 pg/mL postmenopause, and 10–40 pg/mL for adult males; because Mayo does not split premenopausal results by phase, that interval appears for each cycling choice. Conversion uses 1 pg/mL = 1,000 ÷ 272.38 = 3.671 pmol/L and is rounded only for display. The mapper uses an estimated luteal phase 14 days before the next period; shorter or longer usual cycles shift that guide. These are illustrative intervals tied to the cited report, not universal cut-offs.
Reference intervals describe the population and method used by a laboratory; they are not universal treatment thresholds. The reporting laboratory's interval normally takes priority over an example shown here. Age, sex, pregnancy, cycle phase, collection time, fasting status, assay calibration, medicines, and jurisdiction can all change what a result means.
For the named source behind this page, see Labcorp estradiol test reference information. The follicular, ovulation, and luteal intervals come from Labcorp Estradiol test (Roche ECLIA reference intervals).The sources are provided so the assumptions can be checked, not so a web calculator can replace the ordering clinician or the laboratory report.
The result is best treated as a prompt to verify context. A value near a boundary can move between categories because of biological variation, rounding, collection conditions, device or assay differences, and the chosen reference population. Repeat testing, when clinically appropriate, should follow the clinician's instructions rather than an arbitrary schedule.
Count cycle day 1 as the first day of bleeding and enter the collection date when known. Usual cycle length is optional; blank uses a 28-day guide. Do not assume ovulation occurs on day 14: shorter, longer, or irregular cycles shift the suggested window. The estimate is a planning aid, not an ovulation detector. If cycle dates are missing, choose the cycle day or phase manually. Calendar guidance may be unreliable or inapplicable in pregnancy or with hormonal contraception. Match the context and original report; assay, specimen timing, hormone therapy, and medicines change results. Specialist interpretation matters during pregnancy, puberty, hormone therapy, and cancer treatment. If symptoms are severe, rapidly worsening, or urgent, seek appropriate medical care instead of waiting for a calculator comparison. Do not infer a diagnosis from a normal-looking result, because a calculator cannot see symptoms, examination findings, medication history, or related laboratory values.
Informational only — not a diagnosis. Share the raw value, unit, collection date, reference interval, and relevant context with a qualified clinician. That information is more useful than reporting the category alone.
Informational only — not a diagnosis. This calculator is general educational information, not medical advice, a laboratory report, a diagnosis, a treatment recommendation, or an emergency service. Reference ranges and clinical practice vary by laboratory, assay, jurisdiction, age, sex, pregnancy, medicines, and patient history. Discuss results and care decisions with a qualified clinician.