Home / Calculators / Cycle and ovulation / Period tracker
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.
Where you are in your cycle, your next six periods, and whether the pattern is worth raising.
Date calculationExact arithmetic on the dating convention named below. Scan dating by your clinic takes precedence.
Projects your next period from your own cycle length. Useful for planning; not reliable as contraception, and not a substitute for a pregnancy test if a period is late.
Source — Projection from the cycle length you enter, assuming a 14-day luteal phase. Cycle length varies between cycles in most people. Not a contraceptive method.
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.
First day of one period to the first day of the next
0 if it started today
That falls in the more than a week away band.
Your result of 14 days to next period sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
Earlier in the cycle. The fertile window shown above is the part that matters if you are trying.
Projection from the cycle length you enter, assuming a 14-day luteal phase. Cycle length varies between cycles in most people. Not a contraceptive method.
Highlighted is the stage this measurement belongs to. It is a map of the process, not a schedule — timings vary by protocol and by clinic.
Use your average over the last few months. If it varies by more than about four days, treat the result as a rough guide, and consider that persistently irregular cycles are worth investigating.
No. Illness, stress, weight change, travel, thyroid problems and PCOS all delay periods. A test is still the quickest way to rule pregnancy in or out.
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 projection from your usual cycle length. Cycle length varies between cycles in most people. 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.
Comparing centres? See every ART-registered fertility clinic in Bangalore, scored on the same five signals.
