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Every calculator in one place, free and with no sign-up. Results show instantly — we don't hide them behind a form. Each one explains what the number means, where the reference ranges come from, and what it cannot tell you.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
These tools provide general information and are not a diagnosis or a substitute for assessment by a qualified clinician. Reference ranges and sources are stated on each calculator. Predictive estimates describe groups of people and cannot predict an individual outcome.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Which recognised risk factors you carry, and what to ask before your trigger.
Compared to published rangesYour values checked against published reference limits. The source is named below; laboratory methods vary.
Ovarian hyperstimulation syndrome is largely predictable and largely preventable. This checks which recognised risk factors you carry, so you can raise them before your trigger rather than afterwards.
Source — Recognised risk factors from the ASRM guideline on prevention of moderate and severe OHSS (2023) and published prediction studies: AMH above roughly 3.4 ng/mL, antral follicle count above 24, younger age, PCOS, and 19 or more follicles of 11mm or larger at trigger. Oestradiol at trigger is also used, though follicle number predicts better. This counts recognised factors — it does not estimate a probability, and it cannot replace monitoring during your cycle.
The bands on this page are drawn from published sources but have not yet been reviewed by our medical team, and some vary by laboratory or assay. Check against the reference range printed on your own report.
Leave at 0 if you do not know it
Total across both ovaries. 0 if unknown
Number 11mm or larger. 0 if not yet at trigger
That falls in the one factor band.
Your result of 0 risk factors present sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
One recognised factor. Worth naming it to your clinic before stimulation starts, so the starting dose and trigger choice take it into account.
Recognised risk factors from the ASRM guideline on prevention of moderate and severe OHSS (2023) and published prediction studies: AMH above roughly 3.4 ng/mL, antral follicle count above 24, younger age, PCOS, and 19 or more follicles of 11mm or larger at trigger. Oestradiol at trigger is also used, though follicle number predicts better. This counts recognised factors — it does not estimate a probability, and it cannot replace monitoring during your cycle.
These tools apply across the process rather than at one point in it.
Rapid weight gain, severe or worsening bloating, breathlessness or difficulty lying flat, marked reduction in how much you are passing urine, severe abdominal pain, or calf pain and swelling. Any of these after egg collection needs urgent contact with your clinic or emergency care — do not wait for a routine appointment.
Mainly by changing the trigger and delaying transfer. A GnRH agonist trigger instead of hCG, combined with freezing all embryos and transferring in a later cycle, substantially reduces severe OHSS in high responders. A lower starting gonadotropin dose also helps.
No. PCOS raises the risk and is the most common single factor, but most women with PCOS complete IVF without OHSS — particularly where an agonist trigger and freeze-all are used. It is a reason to plan differently, not a reason to avoid treatment.
It reduces it substantially but does not abolish it. Early OHSS can still occur after an agonist trigger, and PCOS remains the commonest factor in those cases. The warning signs still matter.
No. This uses baseline factors known before or during stimulation. What actually catches developing OHSS is ultrasound and blood monitoring through the cycle, and how you feel after egg collection.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
A risk-factor check, not a prediction. It recommends no medication and no dose; those decisions belong to your clinician with your monitoring data. Nothing here is a diagnosis or a substitute for assessment by a clinician.
A calculator gives you a number. These explain what it means, and what it does not.
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