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Progesterone to Estrogen Ratio Calculator

Health

Calculate the progesterone-to-estradiol (P/E2) ratio from serum progesterone (ng/mL) and estradiol (pg/mL) lab values. A reference calculation, not a diagnosis.

Reviewed by the thecalcu.com team · Last updated July 25, 2026

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Progesterone/Estradiol (P/E2) Ratio

66.67

This calculator computes your Progesterone/Estradiol (P/E2) Ratio from the values you enter.

Inputs
ProgesteroneEstradiol
Outputs
Progesterone/Estradiol (P/E2) Ratio

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.

Why Use a Progesterone to Estrogen Ratio Calculator?

Progesterone and estradiol are typically reported in different units, making a direct ratio calculation error-prone without careful unit conversion. This calculator handles that conversion automatically before computing the ratio.

Who Should Use This Calculator?

  • Anyone reviewing their own hormone panel results who wants to calculate the P/E2 ratio.
  • Students of reproductive endocrinology learning how hormone ratios are derived across different units.
  • Healthcare educators demonstrating the unit conversion and ratio calculation.
  • Researchers working with hormone panel data.

What Insights Does the Progesterone to Estrogen Ratio Calculator Give You?

The Progesterone/Estradiol (P/E2) Ratio is the sole output, calculated after converting progesterone to matching units with estradiol, a standard reference figure sometimes considered alongside other hormone panel values.

How to use this P/E2 Ratio calculator

  1. Enter your progesterone value in ng/mL.
  2. Enter your estradiol value in pg/mL.
  3. Read the P/E2 Ratio instantly.
  4. Discuss any specific lab results with a qualified healthcare professional for proper interpretation.
Show formula & methodology ↓Show less ↑

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

What is the progesterone-to-estradiol (P/E2) ratio?
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.
Why do progesterone and estradiol need unit conversion before calculating the ratio?
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.
How is the P/E2 ratio calculated?
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.
Is this calculator a diagnostic tool?
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.
Where do I find progesterone and estradiol values?
Both are measured through blood tests, commonly ordered together as part of a hormone panel in fertility or reproductive health evaluations.
Why might this ratio be tracked during the luteal phase?
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.
How does this relate to the Luteal Phase Calculator?
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.
Can hormone levels vary significantly throughout the day?
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.
Is a specific P/E2 ratio considered 'ideal'?
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.
How does this relate to the Testosterone to Estradiol Ratio Calculator?
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
P/E2 ratio calculatorprogesterone estradiol ratiohormone ratio calculatorluteal phase hormone ratio