Pregnancy Probability Calculator
This pregnancy probability calculator estimates conception likelihood based on menstrual cycle data and unprotected intercourse timing. It helps users understand potential fertility windows using ovulation prediction, helping family planning decisions. Results are statistical estimates only.
Days Since Last Period:
Unprotected Sex Days Ago:
Formula Used
Probability = (Ovulation Window Probability) × (Sperm Survival Factor). Uses normal distribution around day 14 (ovulation day) for cycle probability (σ=3 days). Sperm survival considered up to 5 days. Formula: P = e^(-0.5*((d-14)/3)^2) × (1 - (sperm_age/5))
How to Use
1. Enter average menstrual cycle length (usually 28 days). 2. Input days since last period started. 3. Specify days since unprotected intercourse. Click calculate to get conception probability percentage based on biological fertility models.
FAQs
1. How accurate is this calculator?
This calculator provides statistical estimates based on cycle timing and biological models (60-70% accuracy). Actual conception depends on individual health factors, sperm quality, and precise ovulation timing.
2. Does it work for irregular cycles?
Accuracy decreases with irregular cycles as ovulation prediction becomes harder. Recommended to use basal body temperature or ovulation kits for better results.