Free tools
Fertility Tools & Calculators
25 free, private fertility tools grounded in ASRM, ACOG, and FIGO guidance — track your cycle and fertile window, read a semen analysis, and plan a fertility evaluation or IVF/IUI cycle. Every one runs entirely in your browser: nothing you enter is sent, saved, or shared.
Track your cycle
Find your fertile window
Chart your cycle, spot ovulation, and know your most fertile days — grounded in ACOG and FIGO guidance.
Ovulation calculator
Enter your last period and cycle length for your fertile window, ovulation day, the two most fertile days, your next three windows, and the earliest reliable test date. ACOG grounded.
Open toolPeriod calculator
Predict your next three period dates and each cycle's fertile window, and see whether your cycle sits inside the FIGO normal range. Private — runs entirely on your device.
Open toolOvulation test timing
Enter your cycle length and get the exact day to start daily OPK strips, your likely LH-surge window, and estimated ovulation day — plus a strategy for irregular cycles.
Open toolBBT Chart & Ovulation
Log your daily waking temps and let the classic three-over-six rule spot your thermal shift — coverline, retrospective ovulation estimate, and a running luteal count. Stays on your device.
Open toolCycle Regularity Checker
Enter 3–6 recent cycle lengths or period start dates to see your average, range, and whether the variation counts as regular under the FIGO criteria — plus when it's worth seeing a clinician.
Open toolLuteal Phase Calculator
Work out the stretch between ovulation and your next period, and see how it compares to the typical 12–14 days. One short cycle means nothing — the pattern is the signal.
Open toolImplantation calculator
Turn your ovulation date (or last period) into your 6-12 DPO implantation window, the 8-10 DPO peak, and the smartest days to test. Runs on your device — nothing sent or saved.
Open toolCervical Mucus Identifier
Describe what your cervical mucus looks like today — from dry and sticky to slippery egg-white — and see where you likely are in your cycle and how fertile that sign is. A timing guide, not birth control.
Open toolEvaluate & plan
Evaluate and plan treatment
From a first fertility check-in to IVF and IUI planning — honest, qualitative reads that route to a specialist, never a guarantee.
Pregnancy chances by age
See the average per-cycle chance of conceiving for your age band, your odds over 6 and 12 cycles, and when ACOG says it's time for a fertility evaluation.
Open toolTwins Odds Calculator
See how your chances of twins compare with the ~3% US average, and which factors move them — fertility treatment, family history, age, ancestry, height, and parity. A cited estimate for curiosity, not a prediction.
Open toolPreconception checklist
Folic acid, vaccines, STI screening, medication and condition review, and lifestyle — a personalized to-do list of what to sort out before trying, built on CDC preconception care.
Open toolFemale Fertility Quiz
Ten private questions on the factors that shape female fertility — what each answer means, which ones you can change, and when guidance says to get evaluated. Not a fertility test; nothing leaves your device.
Open toolMale Fertility Quiz
Ten questions on the factors that affect sperm — heat, smoking, testosterone, varicocele, meds — with what's changeable and when a semen analysis is warranted.
Open toolSemen analysis interpreter
Enter your semen analysis numbers to see them in plain English against the WHO 2021 reference values — volume, count, motility, morphology, and more. Educational, not a diagnosis.
Open toolTotal Motile Sperm Count (TMSC)
Turn your semen analysis into one number. Enter volume, concentration, and motility to calculate your total motile sperm count (TMSC) — and see the ranges fertility specialists weigh for natural conception, IUI, and IVF. An estimate, not a diagnosis.
Open toolClomid Cycle Calculator
Prescribed Clomid? Map your exact tablet days onto the calendar: pill dates, the expected ovulation window (5–10 days after the last tablet), intercourse timing, and when your clinic usually checks.
Open toolWhen to see a specialist
How long to keep trying before getting evaluated, from your age, how long you've been trying, and any red flags — using ASRM and ACOG thresholds.
Open toolAMH & Ovarian Reserve
Enter your AMH result in ng/mL or pmol/L with your age and see it read against general, age-aware context — what ovarian reserve does and doesn't mean: egg quantity, not quality, and never a fertility verdict.
Open toolCarrier Screening Chooser
Five private questions on carrier screening — the test on you and your partner (not the baby) that ACOG recommends offering everyone planning or pregnant — with standard vs expanded panels and why a carrier isn't affected.
Open toolEgg Freezing by Age
An honest, age-aware guide to elective egg freezing — what it involves, why freezing younger tends to bank more and better-quality eggs, and the questions to bring to a fertility specialist. Educational, never a guarantee.
Open toolIVF success factors
An honest, qualitative read on what shapes IVF success — age, own vs donor eggs, prior births/IVF, BMI, diagnosis — plus per-cycle vs cumulative odds. No invented percentage; routes to the CDC/SART tools for a real number.
Open toolIUI success factors
What shapes whether intrauterine insemination is likely to work — age, diagnosis, ovulation meds, total motile sperm count, cycles tried — in an honest, qualitative read. Every result routes to a fertility specialist.
Open toolProgesterone interpreter
Enter a serum progesterone with your context — mid-luteal to see whether it points to ovulation, or early pregnancy for general context. Private, in-browser, never a diagnosis.
Open toolDay-3 FSH & estradiol
Read your cycle day-3 FSH and estradiol together as an ovarian-reserve signal — including the catch that a high estradiol can suppress FSH and hide it. Qualitative bands, never a fertility verdict.
Open toolAntral follicle count
Enter your total antral follicle count with your age and see it read as lower, typical, or higher — plus what it suggests about IVF stimulation response. A marker of egg quantity, not a pregnancy predictor.
Open toolWhy trust these
Built to a clinical standard
Each tool is a transparent rules engine built directly on published guidance, chiefly the American Society for Reproductive Medicine and ACOG, not a black box.
Every result is framed as an estimate with a clear next step, never as a diagnosis, and every tool links to the exact sources it uses and the date it was last reviewed. Because they run on your device, using them tells us nothing about you.
Medically Reviewed & Fact-Checked · Updated
Reviewed by EasySTD Editorial Team
Compiled and checked by EasySTD's editorial team against CDC and public-health sources. This is educational information, not a substitute for advice from a licensed clinician. Our editorial guidelines →
3 Sources
Data & references
- ASRM: Patient resources & clinical guidancehttps://www.reproductivefacts.org/
- ACOG: Infertility FAQshttps://www.acog.org/womens-health/faqs/infertility
- WHO: Semen analysis reference values, 6th editionhttps://www.who.int/publications/i/item/9789240030787
Good to Know
Fertility tools: frequently asked questions
Privacy, accuracy, and what these tools can and can't do.
Are these fertility tools free?
Yes. Every tool here is completely free, with no account, sign-up, or payment. EasySTD is an information and comparison directory: the tools are here to help you understand your options and find care.
Is what I enter private?
Yes. Each calculator runs entirely in your browser. The dates and details you enter are never sent to a server, saved, or shared, and using a tool tells us nothing about you. Close the tab and everything is gone.
Can these tools replace a fertility specialist?
No. These are educational tools grounded in ASRM and ACOG guidance. They give general estimates and clear next steps, not a diagnosis or medical advice — a semen analysis, bloodwork, or ultrasound read by a clinician is what actually confirms things.
Where does the medical information come from?
Every tool cites its sources, primarily the American Society for Reproductive Medicine (ASRM), the American College of Obstetricians and Gynecologists (ACOG), and other published clinical guidance. Each page lists its references and shows when it was last reviewed.
Have a different question? Browse the full STD & STI FAQ library, every question we answer, in one place.