What are the odds of experiencing infertility when trying to conceive?
Evidence quality 5.0/5
Eight-dimension review score against the quality rubric . Each dimension scored 1–5.
- D1 Source grounding
- 5/5
- D2 Source authority
- 5/5
- D3 Arithmetic
- 5/5
- D4 Uncertainty
- 5/5
- D5 Scope
- 5/5
- D6 Prose
- 5/5
- D7 Perception honesty
- 5/5
- D8 Caveat completeness
- 5/5
Lifetime probability · lifetime, subgroup
1 in 5.7
18% lifetime chance
Most people underestimate this.
range 1 in 7.9 to 1 in 4.4
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≈ As likely as
Perceived
Most couples approaching conception assume it will happen within a few months. Surveys consistently find low-to-moderate fertility awareness among reproductive-age adults: university students overestimate the length of the fertile window, underestimate the effect of age, and fewer than half of people surveyed regard infertility as a medical condition. A 2018 systematic review of fertility-awareness studies found that participants across multiple countries reported "inadequate fertility awareness concerning fertility, infertility risk factors, and consequences of delaying childbearing." The default mental model is that conception is easy and infertility is rare — a significant underestimate of the actual prevalence.
Rough estimate: Most couples assume conception will happen quickly; fewer than half consider infertility a medical condition
Actual
~1 in 6 couples (17.5% lifetime prevalence)
reproductive-age couples globally, 12-month definition
Show derivation
Uses the WHO 2023 pooled lifetime prevalence estimate of 17.5% for 12-month infertility, drawn from Cox et al. (2022) systematic review of 133 studies spanning 1990-2021. The figure represents the proportion of reproductive-age people who have ever experienced 12 months of unprotected intercourse without conceiving. Period prevalence (at any given time) is lower at 12.6%. The WHO report found limited variation by income level: 17.8% in high-income countries vs 16.5% in low- and middle-income countries. US-specific data from the 2015-2019 NSFG gives 8.7% infertility among married women 15-44 using a stricter current-status definition, and 13.4% impaired fecundity among all women 15-49. The WHO lifetime figure of 17.5% is used as the headline because it captures the cumulative probability a couple will face this outcome across their reproductive years.
Caveats: The headline 17.5% is a lifetime prevalence — the proportion of reproductive-age…
The headline 17.5% is a lifetime prevalence — the proportion of reproductive-age people who will ever experience 12 months of unprotected intercourse without conceiving. Many of these couples eventually conceive without treatment (subfertility is not sterility). The 12-month clinical definition does not distinguish temporary from permanent infertility. Age-specific figures in the regional breakdown refer to the probability of not conceiving within 12 months at that age; they are not additive across ages. Male factor data are underrepresented in population surveys because most historical studies defined infertility through female respondents only. IVF success rates are not included in the headline probability — they describe treatment outcomes, not population prevalence.
Regional breakdown
The headline figure averages across very different populations. Here’s how the probability varies by geography or context:
| Region / context | Lifetime probability | Notes |
|---|---|---|
| Female age under 30 | 1 in 6.7 |
~85% conceive within 12 months; ~15% meet the 12-month infertility definition |
| Female age 30 | 1 in 4.0 |
~75% conceive within 12 months; probability of infertility rises to ~25% |
| Female age 35 | 1 in 2.9 |
~66% conceive within 12 months; ACOG recommends evaluation after 6 months at this age |
| Female age 38 | 1 in 2.3 |
Accelerating decline; roughly 56% conceive within 12 months |
| Female age 40 | 1 in 1.8 |
~44% conceive within 12 months; ACOG recommends immediate evaluation |
| Female age 43+ | 1 in 1.4 |
Fewer than 1 in 3 conceive within 12 months; egg quality and quantity sharply reduced |
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About one in six couples of reproductive age will experience infertility, defined clinically as 12 months of unprotected intercourse without conception. The WHO’s 2023 report, drawing on a meta-analysis of 133 studies spanning three decades, put the global lifetime prevalence at 17.5% — a number that held remarkably steady across income levels (17.8% in high-income countries, 16.5% in low- and middle-income). The strongest single predictor is female age: before 30, roughly 85% of couples conceive within a year; by 35 that drops to 66%; by 40, to 44%. The decline is not linear — fecundability begins a gradual slide around age 32 and steepens sharply after 37, driven primarily by falling oocyte quality and quantity.
The perception gap runs in the underestimation direction. Surveys of reproductive-age adults consistently find that most people assume conception will happen quickly and do not consider infertility a medical condition — fewer than 38% of respondents in one international survey classified it as such. University students across multiple countries overestimate the fertile window, underestimate the age-related decline, and are largely unaware that the 12-month threshold even exists as a clinical definition. The result is that couples who do encounter difficulty tend to interpret it as an individual failure rather than a one-in-six population outcome. US-specific data from the 2015-2019 National Survey of Family Growth found 8.7% of married women aged 15-44 currently infertile and 13.4% of all women 15-49 with impaired fecundity — numbers that rose from the prior survey cycle.
Male factor is the under-discussed half. According to AUA/ASRM guidelines, a male factor is solely responsible in about 20% of infertile couples and contributory in another 30-40%, meaning roughly half of all infertility involves a male component. Yet population surveys have historically defined infertility through female respondents, and public discourse overwhelmingly frames it as a women’s health issue. The 2024 NHSR report was among the first US government publications to report male infertility prevalence alongside female: 11.4% of men aged 15-49 had some form of subfertility or nonsurgical sterility. Age affects male fertility too, though the curve is shallower — sperm quality declines gradually after 40, with longer time-to-pregnancy and modestly elevated miscarriage risk, but without the sharp cliff that oocyte depletion imposes on the female side.
Related tidbits
17.5% of couples experience infertility. 42% of marriages end in divorce. One derails the family plan. The other derails the family. Both are more common than people admit at dinner parties.
About 1 in 6 couples experience infertility (17.5%). Miscarriage affects roughly 20% of recognized pregnancies. Both are far more common than most people realize, and both remain under-discussed.
Claim ledger
Every number below is what each source reported, with the verbatim quote we relied on and how we arrived at our figure. Click any link to verify directly.
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[1] Human Reproduction Open (Cox et al.) — Infertility prevalence and the methods of estimation from 1990 to 2021: a systematic review and meta-analysis
Infertility prevalence and the methods of estimation from 1990 to 2021: a systematic review and meta-analysis- Statistic
Pooled lifetime prevalence of 12-month infertility: 17.5%; period prevalence: 12.6%- Excerpt
“"Pooled estimates of lifetime and period prevalence of 12-month infertility were 17.5% and 12.6%, respectively, but this varied by study population and methodological approach." ”
- Source data from
- 2022-11-12
- Accessed
- 2026-04-19 · archived copy
- Calculation
- Systematic review and meta-analysis of 133 studies from 1990-2021. This is the evidence base underlying the WHO 2023 infertility report. Lifetime prevalence 17.5% (1 in ~6) is used as the native estimate. Period prevalence 12.6% anchors the uncertainty low bound. Highest regional lifetime prevalence was 23.2% (Western Pacific), lowest 10.7% (Eastern Mediterranean). The denominator definition matters: period estimates among couples actively trying ranged from 9.4-32.0%.
- Independence
- This is the primary meta-analysis underpinning the WHO 2023 report. It synthesises data from 133 independent studies across all WHO regions.
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[2] World Health Organization — 1 in 6 people globally affected by infertility: WHO
1 in 6 people globally affected by infertility: WHO- Statistic
Around 17.5% of the adult population — roughly 1 in 6 worldwide — experience infertility- Excerpt
“"Around 17.5% of the adult population – roughly 1 in 6 worldwide – experience infertility, showing the urgent need to increase access to affordable, high-quality fertility care for those in need." ”
- Source data from
- 2023-04-04
- Accessed
- 2026-04-19 · archived copy
- Calculation
- WHO policy report summarising the Cox et al. 2022 systematic review. Confirms the 17.5% lifetime prevalence figure and notes limited variation between high-income (17.8%) and low- and middle-income countries (16.5%). Used as corroborating governmental source for the headline number.
- Independence
- Dependent on the Cox et al. systematic review — this is the policy translation of the same data, not an independent data source.
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[3] National Health Statistics Reports, No. 202 (Chandra & Copen) — Infertility and Impaired Fecundity in Women and Men in the United States, 2015-2019
Infertility and Impaired Fecundity in Women and Men in the United States, 2015-2019- Statistic
8.7% of married women aged 15-44 were infertile; 13.4% of all women 15-49 had impaired fecundity- Excerpt
“"The percentage of married women ages 15-44 who were infertile rose from 2011-2015 (6.7%) to 2015-2019 (8.7%). Among all women, 13.4% of women ages 15-49 and 15.4% of women ages 25-49 had impaired fecundity in 2015-2019." ”
- Source data from
- 2024-04-24
- Accessed
- 2026-04-19 · archived copy
- Calculation
- US-specific data from the National Survey of Family Growth (NSFG), 2015-2019 cycle. Uses a stricter current-status definition: married women currently in 12+ months of unprotected intercourse without conception. The 8.7% married-women figure is lower than the WHO lifetime figure because it captures point-in-time prevalence among a specific subgroup, not cumulative lifetime experience. Impaired fecundity (13.4%) is a broader measure including difficulty carrying to term.
- Independence
- Entirely independent US household survey data (NSFG), separate from the WHO meta-analysis which pooled international studies.
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[4] American College of Obstetricians and Gynecologists — Female age-related fertility decline. Committee Opinion No. 589
Female age-related fertility decline. Committee Opinion No. 589- Statistic
Fecundity decreases gradually but significantly beginning at age 32 and more rapidly after age 37- Excerpt
“"The fecundity of women decreases gradually but significantly beginning approximately at age 32 years and decreases more rapidly after age 37 years." ”
- Source data from
- 2014-03-01
- Accessed
- 2026-04-19 · archived copy
- Calculation
- ACOG Committee Opinion providing the clinical framework for age-related fertility decline. Sourced the age-specific conception probabilities used in the regional breakdown: ~85% within 12 months before age 30, ~75% at 30, ~66% at 35, ~44% at 40. Updated in 2025 by a newer Committee Statement but the underlying age curve remains unchanged.
- Independence
- Clinical practice guideline synthesising multiple reproductive biology studies. Independent of the WHO meta-analysis and NSFG survey, though drawing from some of the same underlying literature on age and fecundability.