Progesterone Level Calculator

Calculator Input

Main page sections stay in one vertical flow, while the input area switches to 3 columns on large screens, 2 on smaller screens, and 1 on mobile.

Progesterone Value Enter the measured serum progesterone value.

Unit The calculator converts both units automatically.

Clinical Context Choose the best matching phase or enter a custom range.

Interpretation Goal Changes summary notes and screening logic.

Cycle Day Useful when reviewing timing-sensitive menstrual results.

Progesterone Therapy Adds a caution note to the report.

Custom Lower Limit Uses the selected unit above.

Custom Upper Limit Upper limit must be greater than lower limit.

Clinical Notes Optional short note for your report export.

Reset

Example Data Table

These examples show how the tool can classify a value against the selected context.

Case	Value (ng/mL)	Value (nmol/L)	Context	Expected Range	Illustrative Result
Sample A	0.60	1.91	Follicular	0.10 to 0.90	Within range
Sample B	8.40	26.71	Ovulatory	0.10 to 12.00	Within range
Sample C	14.20	45.16	Luteal	1.80 to 23.90	Within range
Sample D	6.80	21.62	Luteal, Day 22	1.80 to 23.90	Within range, but below the common day 21–23 ovulation screening threshold
Sample E	32.00	101.76	Pregnancy First Trimester	11.00 to 44.30	Within range

Formula Used

This calculator combines unit conversion, range comparison, midpoint deviation, and optional ovulation-screening notes.

Metric	Formula	Meaning
SI conversion	nmol/L = ng/mL × 3.18	Converts conventional units into SI units.
Reverse conversion	ng/mL = nmol/L ÷ 3.18	Converts SI units back into conventional units.
Midpoint	(Lower Limit + Upper Limit) ÷ 2	Shows the center of the selected interval.
Deviation	Measured Value − Midpoint	Shows how far the result sits from the range center.
Range position	((Value − Lower Limit) ÷ (Upper Limit − Lower Limit)) × 100	Shows where the result falls inside the range when it is within limits.
Ovulation screen note	Day 21 to 23 result > 10 ng/mL	Often used as supportive evidence of ovulation in a timed luteal sample.

Reference ranges vary by assay, specimen timing, medication use, pregnancy stage, and the laboratory performing the test.

How to Use This Calculator

Enter the progesterone value from the lab report.
Select the unit shown on the report: ng/mL or nmol/L.
Choose the clinical context that best matches the patient status.
Pick the interpretation goal, such as general review or ovulation screening.
Enter cycle day if timing matters for the sample.
Use custom limits when your laboratory report provides different intervals.
Click the calculate button to generate the summary above the form.
Use the CSV or PDF buttons to export the result report.

FAQs

1. What does this calculator do?

It converts progesterone units, compares a result with a selected reference interval, shows midpoint deviation, and adds timing-based interpretation notes for common review scenarios.

2. Can this calculator diagnose infertility or miscarriage?

No. It is an educational interpretation helper. Diagnosis depends on symptoms, ultrasound, repeat testing, medications, clinical history, and direct review by a qualified clinician.

3. Why is cycle day important?

Progesterone changes across the menstrual cycle. A value can look low or high depending on whether the sample was taken in the follicular, ovulatory, or luteal phase.

4. Why do laboratories use different reference ranges?

Ranges vary by assay method, equipment, calibration, reporting unit, patient population, and whether the lab uses pregnancy-specific or cycle-phase specific intervals.

5. What is the purpose of the custom range option?

It lets you match the exact lower and upper limits printed on a lab report. That often gives a more relevant comparison than a generic interval.

6. Why does the tool mention day 21 to 23 ovulation screening?

A timed luteal progesterone sample is commonly used to support ovulation review. The tool adds a note when the interpretation goal is ovulation screening.

7. Can medication change progesterone interpretation?

Yes. Fertility treatment, progesterone supplementation, and some hormone therapies can change measured values and should be considered before drawing conclusions.

8. Is a single progesterone value enough by itself?

Often no. Trend testing, sample timing, symptoms, ultrasound findings, and other hormones may be needed for a more complete reproductive or pregnancy assessment.