Free Tools
Pregnancy and fertility tools
Free calculators and planners for cycle timing, OPKs, pregnancy tests, the days after a BFP, and clinic stats such as AMH, semen analysis, IVF success rates, and IUI costs.
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Cycle, ovulation, and fertile window
Use these when you want calendar timing: next period, estimated ovulation, the days you are most likely to conceive, or how many days past ovulation you are.
Period Calculator
Predict your next period, ovulation date, and fertile window based on your last period and cycle length.
Ovulation Calculator
Predict your ovulation date and fertile window to find the best days to conceive.
Fertility Window Calculator
Find the days in your cycle when you are most likely to get pregnant, with conception probability by day.
DPO Calculator
Calculate exactly how many days past ovulation you are today based on your cycle data.
Ovulation tests (OPKs)
Use these when you have LH strips and need a start day, a surge prediction from your readings, or a next step after a faint or missing peak.
OPK Start Day Calculator
Find the cycle day to start ovulation tests, how many strips to pack, and a day by day testing window.
OPK Surge Predictor
Enter your OPK readings and cycle length to predict your LH surge peak and see your LH curve.
LH Test Troubleshooter
Work out why an ovulation test stayed faint or never peaked, and what to try next.
Pregnancy tests
Use these when you want a test day, an implantation window, a side-by-side look at line photos, or a 48-hour retest plan.
Pregnancy Test Calculator
Find the earliest and most accurate day to take a pregnancy test based on your last period and cycle length.
Implantation Calculator
Estimate your implantation window and understand when a pregnancy test could first turn positive.
Pregnancy Test Line Progression Checker
Upload and compare your pregnancy test photos side-by-side to track line progression over time (e.g. 8 DPO to 12 DPO).
Pregnancy Test Retest Planner
Plan your next retest date after a faint line or negative. Get a 48-hour schedule with DPO tracking and calendar export.
After a positive
Use these after a BFP for first-week steps, spotting or bleeding, hCG doubling, a due date, and how many weeks pregnant you are.
Positive Pregnancy Test Action Plan
A calm checklist for the first days after a BFP, including folic acid, booking care, and warning signs.
Early Bleeding Next Step Planner
Work out a sensible next step for spotting, a period like bleed, or bleeding after a positive test.
hCG Level Calculator
Track expected hCG doubling times and understand what your levels mean at each stage of early pregnancy.
Due Date Calculator
Calculate your estimated due date from your last menstrual period or known conception date.
Pregnancy Week Calculator
Find out how many weeks pregnant you are, which trimester you are in, and track upcoming milestones.
Clinic results and treatment
Use these when a letter or brochure has AMH units, a semen analysis, an IVF success percent, or IUI cost and success figures.
AMH Unit Converter
Convert AMH between pmol/L and ng/mL with the 7.14 factor, see both units, and get questions to take to clinic.
Semen Analysis Result Guide
Compare a semen analysis to WHO 6th edition lower limits. One low line is not infertility.
IVF Success Rate Decoder
Work out whether a clinic number is per cycle started, per transfer, or cumulative, with named registries.
IUI Cost and Success Comparator
Typical private IUI fee bands in native currency, plus success named per cycle, not per person.
Which tool should I use?
- Faint line. Open the retest planner for a 48-hour next test, or the line progression checker to compare photos.
- OPK never peaked. Use the LH test troubleshooter.
- Clinic success percent. Use the IVF success rate decoder.
Frequently Asked Questions
What is the difference between the DPO calculator and the pregnancy test calculator?
The DPO calculator counts how many days past ovulation you are. The pregnancy test calculator suggests the earliest and more reliable days to test from your last period and cycle length. Use DPO if you already know or have estimated ovulation. Use the pregnancy test calculator if you want a test date from period data.
Should I use an OPK or a pregnancy test?
OPKs detect LH before ovulation. Pregnancy tests detect hCG after implantation. If you are timing sex or insemination, start with the OPK start day calculator. If you are waiting to see whether this cycle worked, use a pregnancy test tool.
I have a faint line. Which tool should I open?
The retest planner gives a 48-hour next-test date. The line progression checker compares photos over days. Neither replaces a blood test if you need one.
Can these tools read my clinic's IVF success rate?
Home cycle calculators cannot. If you have a clinic percent, use the IVF success rate decoder to see whether it is per transfer, per cycle started, or something else. The AMH and semen tools help you read lab units and WHO limits, not a diagnosis.
Are these tools medical advice?
No. They are literacy and planning tools. Decisions about testing, treatment, or worrying symptoms belong with a clinician.
