Estrogen to Progesterone Ratio Calculator
Quick Toggle:
Visual Ratio Comparison
Your ratio (blue) vs. optimal range (green: 100-500) [Luteal phase reference].
Common Estrogen Progesterone Ratios
| Cycle Phase | Optimal Ratio (P4:E2) | Progesterone pg/mL | Estradiol pg/mL |
|---|---|---|---|
| Follicular | 50-100 | 100-300 | 30-100 |
| Ovulation | 100-300 | 300-600 | 100-400 |
| Luteal | 100-500 | 500-2000 | 50-150 |
Ratio Formula and Steps
- Convert units to pg/mL: Progesterone ng/mL × 3180 = pg/mL; E2 remains pg/mL if already.
- Divide: Ratio = Progesterone pg/mL ÷ Estradiol pg/mL.
- Check range: 100-500 ideal for luteal phase balance.
Formula: \( \text{Ratio} = \frac{P4 \, (\text{pg/mL})}{E2 \, (\text{pg/mL})} \).
Testing Norms: US vs. Europe
- US labs often report P4 in ng/mL, E2 pg/mL.
- Europe favors pg/mL for both; ratios consistent post-conversion.
- Day 21 luteal testing standard globally.
Balance Scenarios
- Ratio >500: Progesterone dominant.
- Ratio <100: Estrogen dominant.
- 100-500: Balanced luteal phase.
Frequently Asked Questions
What is optimal pg e2 ratio in luteal phase?
100-500 supports cycle balance.
How to convert ng/mL progesterone to pg/mL?
Multiply by 3180 for accurate ratio calc.
When to test estrogen progesterone ratio?
Day 21 of cycle for luteal insight.
References
- Testmottagningen.se. Progesterone-Estrogen Ratio Calculator. 2023.
- Omni Calculator. PG/E2 Ratio. Accessed 2025.
- Rupa Health. Estrogen to Progesterone Ratio. 2023.
- Prior JC. Progesterone for Symptomatic Menopause Treatment. Climacteric. 2018;21(4):358-365.
- Stanczyk FZ. All About Estradiol Testing. Clin Chem. 2014;60(5):832-834.
Consult healthcare provider for personal advice. Not medical diagnosis.