Pregnancy Rate Calculator

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Pregnancy Rate & Conception Calculator

Estimate your probability of conceiving this cycle based on age and timing.

Peak (Within Fertile Window) Good (1-2 days before/after) Poor (Outside fertile window) Unknown / Random
Less than 1 year 1 to 2 years More than 2 years
Regular Cycles Slightly Irregular Highly Irregular

Your Results

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*Note: This is an estimation based on statistical averages and not a medical diagnosis.

Understanding Pregnancy Rates and Fertility

The journey to conception is a biological process influenced by numerous variables. While many couples expect to conceive immediately, the statistical "Pregnancy Rate" per cycle—often referred to as fecundability—is lower than most realize, even for healthy couples.

The Role of Age in Conception

Female age is the single most significant factor in natural pregnancy rates. This is due to both the quantity and the chromosomal quality of the eggs remaining in the ovaries.

  • Ages 20–25: Peak fertility period with a roughly 25-30% chance per cycle.
  • Ages 30–35: Fertility starts to decline slightly, with about a 20% chance per cycle.
  • Ages 35–40: A more significant decline occurs; by age 40, the chance is approximately 5% per cycle.

The Importance of the Fertile Window

Conception is only possible during a small window each month. This window typically includes the day of ovulation and the five days preceding it. Sperm can live inside the female reproductive tract for up to 5 days, while the egg is only viable for about 12-24 hours after release. Our calculator accounts for "Timing of Intercourse" because having intercourse on the day of ovulation or the two days prior offers the highest statistical probability of success.

Example Calculation Scenarios

Scenario Estimated Rate
24-year-old, Perfect Timing, < 1 year trying ~25% per cycle
36-year-old, Good Timing, < 1 year trying ~12% per cycle
42-year-old, Perfect Timing, 1+ year trying ~2-3% per cycle

When to Seek Help

Medical professionals generally recommend seeking a fertility consultation if:

  • You are under 35 and have been trying for over 12 months.
  • You are between 35 and 40 and have been trying for 6 months.
  • You are over 40 or have known issues like irregular cycles or endometriosis.

function calculatePregnancyRate() { var age = parseFloat(document.getElementById('femaleAge').value); var timing = parseFloat(document.getElementById('timingFactor').value); var years = parseFloat(document.getElementById('yearsTrying').value); var regular = parseFloat(document.getElementById('cycleRegularity').value); if (isNaN(age) || age 55) { alert("Please enter a valid age between 15 and 55."); return; } // Determine Base Rate based on Age (Natural probability for healthy couple) var baseRate = 0; if (age < 25) { baseRate = 25; } else if (age < 30) { baseRate = 23; } else if (age < 35) { baseRate = 20; } else if (age < 38) { baseRate = 15; } else if (age < 40) { baseRate = 10; } else if (age < 43) { baseRate = 5; } else if (age 35) { calculatedChance = 35; } if (calculatedChance 20) { message = "Your chances this cycle are optimal based on your age and timing. Consistency is key!"; } else if (calculatedChance > 10) { message = "You have a good probability of conception. It is common for healthy couples to take 6-12 months to conceive."; } else if (calculatedChance > 3) { message = "Your probability is within the normal range for your demographic, though it may take more time or clinical tracking."; } else { message = "The calculated probability is lower this cycle. Consider tracking ovulation more closely or consulting a specialist if you have been trying for a while."; } descText.innerHTML = "Estimated chance of conception this month: " + calculatedChance.toFixed(1) + "%." + message; // Scroll to results resultDiv.scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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