# Progesterone to Estradiol Ratio Calculator (P/E2)

URL: https://speedycalculator.com/calculators/health/pg-e2-ratio/
Last updated: 2026-10-30

> The progesterone to estradiol ratio calculator converts both hormones to the same units and divides them to give the P/E2 ratio used to assess hormone balance in the luteal phase, with conversions between ng/mL, nmol/L, pg/mL and pmol/L.

## Inputs

- Progesterone (ng/mL, nmol/L)
- Estradiol (pg/mL, pmol/L, ng/mL)

## Results

- Progesterone / estradiol ratio

## Formula

```
P/E2 = progesterone (pg/mL) ÷ estradiol (pg/mL)
Progesterone: 1 ng/mL = 3.18 nmol/L = 1000 pg/mL
Estradiol: 1 pg/mL = 3.671 pmol/L
```

## Explanation

In the mid-luteal phase progesterone is normally 100 to 500 times higher than estradiol. Some practitioners describe a lower ratio as "estrogen dominance", though the term is not a medical diagnosis. In IVF, a high progesterone-to-estradiol ratio at trigger has been linked with lower pregnancy rates.

### How to use the Progesterone to Estradiol Ratio Calculator

- **Progesterone**
- **Estradiol**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter both hormone levels from a blood test taken about 7 days after ovulation (cycle day 21 in a 28-day cycle).

### Inputs explained

FieldWhat to enterProgesteroneUnits: ng/mL, nmol/LEstradiolUnits: pg/mL, pmol/L, ng/mL

### Example values

How the main result changes when **Progesterone** changes and everything else stays at the example values above:

Progesterone (ng/mL)Progesterone / estradiol ratio7.56311.25941512518.7515622.518830250
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — Progesterone: 15 ng/mL; Estradiol: 120 pg/mL.

Results — **Progesterone / estradiol ratio = 125**.

## Key terms

- **P/E2**: Progesterone-to-estradiol ratio.

## FAQ

**When should P and E2 be tested?**
About 7 days after ovulation, in the mid-luteal phase.

**What is a normal mid-luteal progesterone?**
Typically above 10 ng/mL (32 nmol/L) after ovulation.

**Is "estrogen dominance" a diagnosis?**
No – it is a descriptive term; symptoms should be assessed by a doctor.


## Sources

- [Elgindy EA. Progesterone level and progesterone/estradiol ratio on the day of hCG administration. Fertil Steril, 2011](https://pubmed.ncbi.nlm.nih.gov/21334612/)