Progesterone to Estrogen Ratio Calculator
HealthCalculate the progesterone-to-estradiol (P/E2) ratio from serum progesterone (ng/mL) and estradiol (pg/mL) lab values. A reference calculation, not a diagnosis.
Progesterone/Estradiol (P/E2) Ratio
66.67
What is a P/E2 Ratio?
The Progesterone to Estrogen Ratio Calculator computes the P/E2 ratio from serum progesterone (ng/mL) and estradiol (pg/mL) values, converting units appropriately before dividing. This is a standard lab reference calculation, not a diagnostic tool.
For a related fertility timing tool, see the Luteal Phase Calculator.
How to use this P/E2 Ratio calculator
- Enter your progesterone value in ng/mL.
- Enter your estradiol value in pg/mL.
- Read the P/E2 Ratio instantly.
- Discuss any specific lab results with a qualified healthcare professional for proper interpretation.
Formula & Methodology
P/E2 Ratio = (Progesterone [ng/mL] × 1,000) ÷ Estradiol [pg/mL] Worked example — a progesterone of 10 ng/mL and estradiol of 150 pg/mL: P/E2 Ratio = (10 × 1,000) ÷ 150 = 66.67
Frequently Asked Questions
The P/E2 ratio compares progesterone and estradiol hormone levels, sometimes referenced in fertility and hormone balance discussions as one data point among several considered together.
Progesterone is commonly reported in ng/mL while estradiol is commonly reported in pg/mL — since these are different units (nanograms vs picograms), converting progesterone to pg/mL by multiplying by 1000 allows a directly comparable ratio.
The calculator converts progesterone from ng/mL to pg/mL by multiplying by 1000, then divides that figure by the estradiol value in pg/mL.
No — this calculator performs the mathematical conversion and ratio only. Interpreting what a specific P/E2 ratio means for your health requires a qualified healthcare professional reviewing your complete hormone panel and clinical history.
Both are measured through blood tests, commonly ordered together as part of a hormone panel in fertility or reproductive health evaluations.
The luteal phase is when progesterone rises significantly relative to the follicular phase, making this window a common time when the P/E2 ratio is sometimes discussed in fertility contexts, though interpretation always requires professional context.
The [Luteal Phase Calculator](/luteal-phase-calculator/) calculates the timing of the phase during which progesterone and estradiol levels are most commonly measured for this type of ratio calculation.
Yes — hormone levels including progesterone and estradiol can fluctuate throughout the day and across the menstrual cycle, so the timing of blood draws relative to your cycle is an important context factor for interpreting any result.
This calculator provides the ratio calculation only, without a specific threshold interpretation — any consideration of what a specific value might suggest should come from a qualified healthcare professional.
Both calculators perform a similar unit-conversion-then-ratio calculation, but the [Testosterone to Estradiol Ratio Calculator](/testosterone-to-estradiol-ratio-calculator/) is typically referenced in different contexts, often related to male hormone balance.
Also known as