Fertility by Age Calculator

Understand natural conception rates, IVF success rates, and when to seek specialist care based on your age and trying duration.

Your Information

Current Age

Months Trying to Conceive

Cycle Regularity

Partner (if applicable)

Goal: Baby by

Fertility Assessment

Natural Chance per Cycle —%

Avg Time to Conceive—

IVF Success Rate—

12-cycle success—

Months TTC—

See Specialist?—

Goal Feasibility—

12-cycle ≈ 1-(1-p)^12

Specialist: >12mo (<35) or >6mo (≥35)

Natural Fertility Rate by Age (Your Age Highlighted)

Fertility Outcomes by Age

Compare key fertility metrics at different ages. Your current age range is highlighted.

Age	Natural Conception per cycle	IVF Success live birth	Miscarriage risk	Chromosomal abnormality	AMH Range ng/mL	FSH Range mIU/mL

IVF Live Birth Success Rate by Age (SART 2022)

Egg Freezing Success Rates

Age at Freezing	Eggs Needed	Success/Egg	Recommendation
<35	8–10	7–12%	Optimal window
35–37	10–14	5–8%	Good window
38–40	15–20	3–5%	Consider soon
41–42	25–35	2–3%	Diminishing returns
43+	40+	<2%	Donor eggs recommended

Family Timeline Planner

Enter your desired family size and spacing to see a projected timeline with fertility probabilities at each stage.

Current Age

Number of Children

Years Between Children

Family Timeline Projection

TTC period Pregnancy

How to Use This Calculator

Enter your age — Female age is the most critical factor in fertility. Rates are based on CDC/SART research data and are population averages.

Enter months trying — This determines whether you should seek specialist consultation. Guidelines differ by age: 12 months for under 35, 6 months for 35+.

Review your assessment — The calculator provides natural conception probability, IVF success estimate, and a recommendation card. Use the Scenario Analysis tab to compare ages.

Plan your family — Use the Family Planner tab to project timelines for multiple children with fertility probabilities at each stage.

Key Terms

Fecundability — The probability of achieving a pregnancy in a single menstrual cycle.

AMH (Anti-Müllerian Hormone) — Blood marker for ovarian reserve. >1.0 ng/mL normal, <0.5 low.

AFC (Antral Follicle Count) — Ultrasound count of developing follicles; >10 normal, 5–10 low, <5 very low.

TTC — Trying to Conceive. Duration is tracked by clinicians to determine workup timing.

DOR (Diminished Ovarian Reserve) — Low ovarian reserve indicated by AMH, AFC, or FSH levels regardless of age.

MFI (Male Factor Infertility) — Sperm abnormalities contributing to infertility; affects ~40–50% of infertile couples.

Fertility Rates by Age: What the Data Shows

Female fertility follows a well-documented age-related decline driven primarily by the quantity and quality of eggs. At birth, females have approximately 1–2 million eggs. By puberty, this falls to 300,000–500,000. Only 300–500 eggs will ever ovulate during the reproductive years. By the mid-30s, egg quality — particularly chromosomal integrity — begins to decline significantly, increasing miscarriage rates and reducing implantation success.

Natural Conception Statistics

In women under 30, approximately 25–30% of menstrual cycles result in pregnancy when timing is optimal. This falls to roughly 15–20% in the early 30s, 10–12% by the late 30s, and under 5% by the mid-40s. Cumulative conception rates over 12 cycles remain relatively high in the 30s — approximately 80% for women aged 30–34 — but decline more sharply from 37 onwards.

When to Seek Fertility Evaluation

The American Society for Reproductive Medicine (ASRM) recommends fertility evaluation if a couple under 35 has been trying for 12 months without success, or 6 months for women aged 35–40. For women over 40, evaluation is recommended after 3 months. These timelines reflect the increasing time cost of delayed evaluation at older ages.

IVF Success Rates

IVF success rates vary significantly by age and are best understood from SART (Society for Assisted Reproductive Technology) data. Women under 35 using their own fresh embryos achieve live birth rates of approximately 45–50% per transfer. This falls to 32–38% at ages 35–37, 20–25% at 38–40, and under 10% by age 43. Donor egg cycles eliminate the age-related decline, achieving 55–65% regardless of recipient age.

Frequently Asked Questions

At what age does female fertility start to decline?

Fertility begins declining in the late 20s but the decline accelerates significantly after age 35. Monthly conception rates fall from ~20% in the early 30s to ~10% by age 38, and under 5% by the mid-40s. The sharpest decline occurs between ages 37 and 40.

How many eggs does a woman have at different ages?

At birth: 1–2 million. At puberty: 300,000–500,000. At age 30: ~100,000. At age 40: ~10,000. At menopause: fewer than 1,000. Egg quantity declines exponentially, though the rate varies significantly between individuals.

What is considered a normal AMH level?

AMH >1.0 ng/mL is generally considered normal ovarian reserve. 0.5–1.0 is low-normal. Below 0.5 is considered low. However, AMH alone doesn't predict fertility — egg quality and other factors matter.

How long should I try before seeing a doctor?

Under 35: try for 12 months before evaluation. Age 35–39: seek evaluation after 6 months. Age 40+: consult a reproductive endocrinologist after 3 months, or immediately if there are known risk factors like endometriosis, PCOS, or irregular cycles.

Can lifestyle changes improve fertility?

Yes. Maintaining a healthy BMI (18.5–24.9), quitting smoking, limiting alcohol, managing stress, and optimizing vitamin D and folate levels can all positively impact fertility.

What is the success rate of IVF at age 38?

At age 38–40, IVF live birth rates using own eggs are approximately 20–25% per transfer (SART 2022 data). With donor eggs from a younger woman, success rates improve to 55–65%.

Does PCOS affect fertility?

PCOS is a leading cause of anovulatory infertility. Women with PCOS often have irregular or absent ovulation, making natural conception more difficult. However, with medical intervention, most women with PCOS can achieve pregnancy.

What is the ideal age for egg freezing?

The optimal age for egg freezing is before 35. Eggs frozen before 35 have the best quality and highest chance of resulting in a live birth per egg. After 38, the number of eggs needed per successful cycle increases significantly.

How accurate is the fertility data in this calculator?

The data represents population averages from CDC, SART, and peer-reviewed research. Individual fertility varies enormously. This calculator provides statistical context, not a personal prognosis. Consult a reproductive endocrinologist for personalized evaluation.

What fertility tests are typically ordered first?

Typical first-line tests: AMH and AFC for ovarian reserve, Day 3 FSH and estradiol, TSH (thyroid), progesterone on Day 21 to confirm ovulation, and semen analysis for the male partner.

Is miscarriage rate related to fertility?

Yes. Miscarriage rates increase with age due to higher rates of chromosomal abnormalities in eggs. At age 25, approximately 10% of recognized pregnancies end in miscarriage. At 35, this rises to ~15–20%. At 40, approximately 30–40%. At 45+, miscarriage rates exceed 50%.

Can a woman get pregnant after 45?

Natural conception after 45 is very rare (under 1–2% per cycle), and miscarriage rates are very high. Donor eggs from younger women offer the best chance of pregnancy, with success rates of 55–65%.

What is the role of male factor in infertility?

Male factor infertility contributes to approximately 40–50% of infertility cases. Semen analysis checks count, motility, and morphology. Low sperm quality can be treated with lifestyle changes, IUI, or IVF with ICSI.