# Testosterone to Estradiol Ratio Calculator (T/E2)

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

> The testosterone to estradiol ratio calculator works out the T/E2 ratio used in male fertility assessment, converting testosterone from ng/dL or nmol/L and estradiol from pg/mL or pmol/L.

## Inputs

- Total testosterone (ng/dL, nmol/L)
- Estradiol (pg/mL, pmol/L)

## Results

- Testosterone / estradiol ratio

## Formula

```
T/E2 = testosterone (ng/dL) ÷ estradiol (pg/mL)
Testosterone: 1 nmol/L = 28.84 ng/dL · Estradiol: 1 pg/mL = 3.671 pmol/L
A ratio below 10 is considered abnormal in men
```

## Explanation

In men, too much testosterone is converted to estradiol by the aromatase enzyme, especially with obesity. A low T/E2 ratio is linked with poor sperm production, and aromatase inhibitors can improve it under specialist care.

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

- **Total testosterone**
- **Estradiol**

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

### How it works

Enter morning testosterone and estradiol results from the same blood sample.

### Inputs explained

FieldWhat to enterTotal testosteroneUnits: ng/dL, nmol/LEstradiolUnits: pg/mL, pmol/L

### Example values

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

Total testosterone (ng/dL)Testosterone / estradiol ratio2257.5337.511.345015562.518.867522.590030
*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 — Total testosterone: 450 ng/dL; Estradiol: 30 pg/mL.

Results — **Testosterone / estradiol ratio = 15**.

## Key terms

- **Aromatase**: Enzyme that converts testosterone to estradiol.

## FAQ

**What is a normal T/E2 ratio in men?**
10 or more when testosterone is in ng/dL and estradiol in pg/mL.

**What lowers the ratio?**
Obesity, ageing, some medicines and alcohol.

**Can it be treated?**
Weight loss helps; specialists may use aromatase inhibitors.


## Sources

- [Raman JD, Schlegel PN. Aromatase inhibitors for male infertility. J Urol, 2002](https://pubmed.ncbi.nlm.nih.gov/11792937/)