Fertility by Age Calculator · Conception Chances, Miscarriage Risk & IVF Success

Fertility by Age Calculator

See how your chances of natural conception, miscarriage risk, and IVF success change with age based on ACOG, ASRM and CDC data

Your details

Your age

years

Partner's age (optional)

years

AMH level (optional)

ng/mL

Months trying to conceive

months

Quick examples

Your Fertility Profile

Monthly chance of natural conception

— %

— over 12 months — miscarriage risk —

12-month natural

— %

Median time to conceive

— mo

Miscarriage risk

— %

IVF success (3 cycles)

— %

What this means at your age

Metric	Your value	Context

Fertility by age — full reference

Age band	Monthly chance	12-month cumulative	Median time	Miscarriage risk

IVF cumulative live birth by age

Age band	1 retrieval	2 retrievals	3 retrievals	Notes

When to seek a fertility evaluation

Your age	Seek evaluation after	Reason

Embed this calculator

Embed code

Live preview — identical to the main calculator EXACT MATCH

\n'; }function sizeEmbedPreview() { if (!embedPreview) return; try { var doc = embedPreview.contentDocument || embedPreview.contentWindow.document; if (doc && doc.body) { var h = doc.body.scrollHeight || doc.documentElement.scrollHeight; if (h && h > 400) { embedPreview.style.height = Math.min(h + 24, 4000) + 'px'; } } } catch (e) {} }function generateEmbedCode() { if (!embedPanel || embedPanel.style.display !== 'block') { if (embedCodeTextarea) embedCodeTextarea.value = buildToolHtml(); return; } var toolHtml = buildToolHtml(); if (embedCodeTextarea) embedCodeTextarea.value = toolHtml; if (embedPreview) { embedPreview.onload = function () { sizeEmbedPreview(); }; embedPreview.srcdoc = toolHtml; } }var embedRefreshTimer = null; function scheduleEmbedRefresh() { if (!embedPanel || embedPanel.style.display !== 'block') return; if (embedRefreshTimer) clearTimeout(embedRefreshTimer); embedRefreshTimer = setTimeout(function () { embedRefreshTimer = null; generateEmbedCode(); }, 450); }window.toggleEmbedPanel = function () { if (!embedPanel) return; var isHidden = (embedPanel.style.display === 'none' || embedPanel.style.display === ''); if (isHidden) { embedPanel.style.display = 'block'; generateEmbedCode(); try { embedPanel.scrollIntoView({ behavior:'smooth', block:'start' }); } catch (e) {} } else { embedPanel.style.display = 'none'; } };window.closeEmbed = function () { if (embedPanel) embedPanel.style.display = 'none'; }; window.refreshEmbed = function () { generateEmbedCode(); };window.copyEmbedCode = function () { if (!embedCodeTextarea) return; generateEmbedCode(); embedCodeTextarea.select(); embedCodeTextarea.setSelectionRange(0, embedCodeTextarea.value.length); if (navigator.clipboard) { navigator.clipboard.writeText(embedCodeTextarea.value).then(function () { alert('Embed code copied!'); }) .catch(function () { try { document.execCommand('copy'); alert('Embed code copied!'); } catch (e) { alert('Press Ctrl+C to copy'); } }); } else { try { document.execCommand('copy'); alert('Embed code copied!'); } catch (e) { alert('Press Ctrl+C to copy'); } } };function bindAll() { [ageInput, partnerAgeInput, amhInput, monthsTryingInput].forEach(function (el) { if (el) { el.addEventListener('input', function () { calculate(); scheduleEmbedRefresh(); }); el.addEventListener('change', function () { calculate(); }); } }); }function init() { bindAll(); calculate(); if (embedPanel) embedPanel.style.display = 'none'; }if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', init); } else { init(); } })();

Creator & Maintainer

Faiq Ur Rahman is a web designer, digital product developer, and founder of Toolraxy, a growing platform of web-based calculators and utility tools. He specializes in building structured, user-friendly tools focused on health, finance, productivity, and everyday problem-solving.

Rate this Tool

User Ratings:

0 out of 5 stars (based on 0 reviews)

Excellent

Very good

Average

Poor

Terrible

Fertility doesn’t fall off a cliff at 35. It slides. Monthly conception chance drops from roughly 28% under 25 to 8% at 40 and 1% at 45. Miscarriage risk climbs from about 10% in your twenties to over 50% after 45. IVF success falls too, though not as steeply as natural fertility.

Those numbers come from population data, not from your body. They’re still useful. Knowing that a 34-year-old has about a 66% chance of conceiving within a year while a 39-year-old sits at 55% reframes what “trying” looks like at each stage.

This calculator maps your age to those published figures. Plug in your numbers, and the tool returns your monthly chance, your 12-month odds, the median time to conceive at your age, and where IVF outcomes land. If you enter an AMH level, the tool flags whether it’s above median, within range, or below expected for your age.

How to Use the Fertility by Age Calculator

Enter your age in the first field. The tool accepts ages 18 through 45.
Add your partner’s age if you want a note on male fertility timing. It’s optional.
Type your AMH level in ng/mL if you have a recent result. Leave it blank if not.
Set the months you’ve been trying. Use 0 if you’re just starting.
Read the hero panel. Your monthly conception chance sits at the top in large type.
Check the four tiles for 12-month cumulative odds, median time to conceive, miscarriage risk, and IVF success.
Scan the “What this means at your age” table for a personalised summary.
Tap a quick example button (age 26, 35, 40) to see how the numbers shift.

How the Fertility by Age Calculator Formula Works

Formula: Monthly conception chance = age-band rate from published fertility tables

The calculator uses a lookup table, not a continuous formula. Nine age bands span from 18 to 45-plus. Each band carries a monthly conception probability, a 12-month cumulative rate, a median time to conceive, a miscarriage risk, and three IVF success rates.

The 12-month cumulative figure isn’t a straight multiplication of the monthly rate. It reflects real-world conception data where couples have varying fecundity. The median time to conceive is the point at which half the couples in that band have conceived.

Age is clamped between 18 and 45. AMH is optional and compared against age-specific reference ranges. Months trying feeds into a “when to seek evaluation” table rather than changing the probability estimate.

Worked Example

A 36-year-old has been trying for 4 months. Her AMH came back at 1.5 ng/mL. Her partner is 38.

Age band: 34 to 36
Monthly conception chance: 18%
12-month cumulative: 66%
Median time to conceive: 6 months
Miscarriage risk: 15%
IVF success after 3 retrievals: 66%

AMH reference for her age band sits at a median of 1.8 ng/mL with a low threshold of 0.7. Her 1.5 ng/mL falls between those, so the tool flags it as “within normal range for your age” rather than below expected.

Her partner’s age of 38 gets a note: male fertility begins to decline after 40, though at 38 he’s still in the broadly stable range.

She’s been trying 4 months, which is under the 6-month threshold for her age. The evaluation table highlights “35 and over, seek evaluation after 6 months,” which means she has roughly 2 more months before the standard criteria kick in. If her cycles are irregular or she has other risk factors, the tool’s table shows that immediate evaluation is also reasonable.

Frequently Asked Questions

How does fertility change with age?

Monthly conception chance falls from about 28% under 25 to 18% at 34 to 36, 8% at 40 to 41, and 1% after 45. Miscarriage risk climbs from 10% to over 50% across the same range. The decline is driven mainly by egg quality, not egg count.

What is the average age of natural conception?

For first-time mothers in the US, the average age is around 27. That’s a population figure, not a personal prediction. Women conceive naturally across a wide age range, and individual outcomes vary more than the averages suggest.

How long does it take to get pregnant at 35?

The median time to conceive at 35 is about 6 months. Within 12 months, roughly 66% of women aged 34 to 36 conceive naturally. If you’re 35 and have tried for 6 months without success, ACOG recommends a fertility evaluation.

What is a good AMH level by age?

Median AMH sits around 3.4 ng/mL at 18 to 24, 2.4 at 30 to 34, 1.8 at 35 to 37, 1.2 at 38 to 40, and 0.5 at 43 to 44. AMH measures ovarian reserve, not egg quality, so it doesn’t override the age effect on chromosomal normality.

What are the chances of getting pregnant at 40?

At 40, the monthly conception chance is about 8%, and roughly 44% of women conceive within a year of trying. Miscarriage risk sits near 30%. IVF success after three retrievals runs about 40%.

How does IVF success change with age?

Cumulative live birth after three retrievals runs about 75% at 18 to 24, 66% at 34 to 36, 55% at 37 to 39, and 40% at 40 to 41. After 42, it drops to around 25%. Donor eggs remove most of the age effect.

When should you seek a fertility evaluation?

Under 35, after 12 months of trying. At 35 and over, after 6 months. At 40 and over, immediately. Irregular cycles, endometriosis, and prior pelvic surgery justify an earlier evaluation at any age.

Does male age affect fertility?

Yes, though more gradually than female age. Sperm quality declines after 40, and male age above 45 is linked to longer time to conception and slightly higher miscarriage rates. The effect is real but smaller than the maternal age effect.

Can you get pregnant naturally at 42?

Yes, but the odds are lower. At 42 to 44, the monthly conception chance is about 4%, and roughly 25% of women conceive within a year. Miscarriage risk sits near 42%. Many women in this band pursue IVF or donor eggs.

What if you have regular periods but don’t get pregnant?

Regular periods suggest ovulation, but tube blockage, sperm issues, endometriosis, and egg quality problems can all prevent conception. A basic workup includes Day 3 FSH, AMH, a semen analysis, and a hysterosalpingogram.

Does fertility drop suddenly at 35?

No. The decline is gradual and continues through the late 30s and into the 40s. The 35 threshold comes from clinical guidance about when to evaluate, not from a sudden biological cliff.

Is AMH the same as egg quality?

No. AMH measures the number of follicles remaining in the ovaries, which is a rough proxy for egg quantity. It says nothing about the chromosomal normality of those eggs, which is what determines miscarriage risk and live birth probability.

Disclaimer

This fertility by age calculator is for educational purposes only and is not medical advice. It reports age-band averages from published clinical data. Individual fertility varies widely based on AMH, antral follicle count, medical history, sperm quality, and factors the tool cannot see. A normal result here does not rule out a fertility problem, and a lower result does not mean you can’t conceive. If you’ve been trying without success, or if you have risk factors, talk to a reproductive endocrinologist or fertility specialist who can review your full history.