Trying to conceive
Clomid Cycle Calculator
Already prescribed Clomid? Enter the first day of your period and the exact tablet days your prescriber ordered, and see your pill dates, your expected ovulation window, when to time intercourse or ovulation tests, and when your clinic usually checks in. It runs on your device — nothing is sent or saved.
A timing helper only. It never suggests a dose or protocol — it maps the days your prescriber already ordered onto your calendar.
Clomid cycle calculator
Timing estimates based on the clomiphene prescribing information (ovulation typically 5–10 days after the last tablet) — not a diagnosis, a dose, or a treatment plan. Your prescriber's instructions and your clinic's monitoring always take precedence.
Call your prescriber now if, at any point in the cycle:
- Your vision changes — blurring, spots, flashes, or afterimages. Stop taking the tablets and contact your prescriber: the prescribing information advises discontinuing when visual symptoms appear.
- Severe pelvic or abdominal pain, rapid bloating or weight gain, nausea/vomiting, or shortness of breath — possible ovarian hyperstimulation (OHSS). Contact your clinic right away or seek urgent care.
How it works
The math behind a Clomid cycle
Everything hangs off two anchors: cycle day 1 (the first day of your period) and your last tablet. Clomid is prescribed as a 5-day course starting early in the cycle — commonly days 3–7 or days 5–9 — and the prescribing information puts expected ovulation at 5 to 10 days after the last tablet. So on a days 3–7 protocol, the last tablet is cycle day 7 and ovulation is expected around days 12–17; start on day 5 and everything shifts two days later.
Because that's a 6-day window, not a date, the smart play is to cover it: intercourse every 1–2 days starting a couple of days before the earliest expected day (sperm survive several days, the egg only about one), and ovulation tests from just before the window opens so you don't miss the LH surge, which comes roughly a day before ovulation.
Your clinic then confirms what the calendar can only estimate: a mid-cycle scan (if they do one) measures the follicle a few days after your last tablet, and a progesterone blood test about a week after presumed ovulation — the classic "day 21" check on a days 3–7 protocol — confirms whether you actually ovulated. This tool maps those checkpoints onto real dates; your clinic sets the exact days.
| Prescribed days | Last tablet | Expected ovulation5–10 days after last tablet | Classic progesterone check |
|---|---|---|---|
| Days 2–6 | Cycle day 6 | Cycle days 11–16 | ≈ cycle day 20 |
| Days 3–7 | Cycle day 7 | Cycle days 12–17 | ≈ cycle day 21 |
| Days 4–8 | Cycle day 8 | Cycle days 13–18 | ≈ cycle day 22 |
| Days 5–9 | Cycle day 9 | Cycle days 14–19 | ≈ cycle day 23 |
Cycle-day arithmetic from the prescribing information's 5-day course and 5–10-day post-tablet ovulation window. The progesterone column is the common "about a week after mid-window ovulation" check — your clinic sets the exact date. None of this chooses a protocol: use the row your prescriber ordered.
Use it with your clinic
A calendar helper, not a treatment plan
Clomid is a prescription medicine, and the plan belongs to your prescriber. This tool never suggests a dose, a start day, or an extra cycle — it only turns the protocol you were already given into dates. If what you were told differs from anything here, your prescription wins, every time.
Use it with the monitoring your clinic set up, not instead of it. The scan and progesterone checks aren't box-ticking: they tell your prescriber whether this dose worked, whether the next cycle should change, and when to stop — the prescribing information advises against continuing beyond about six cycles in total. And if your vision changes or severe pelvic pain sets in, stop and call: those two symptoms always outrank the calendar.
Next steps
Related tools
Ovulation test timing
When to start LH strips and how to read the surge — the natural companion to a Clomid window.
Ovulation calculator
Your fertile window from cycle length alone, for months you're not on medication.
Implantation calculator
When implantation — and the first faint positive — could plausibly happen after ovulation.
When to see a specialist
How long to try before a full evaluation, from your age and any red flags.
Sources
Where this comes from
The 5-day course, the ovulation window of 5–10 days after the last tablet, the visual-symptom stop rule, and the "about six cycles" ceiling are from the FDA prescribing information for clomiphene citrate. The monitoring framing — mid-cycle scan, progesterone confirmation about a week after ovulation — follows ASRM's ovulation-induction patient guidance. We apply the published timing; we never pick the protocol.
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 →
4 Sources
Data & references
- DailyMed (NIH): Clomiphene citrate — prescribing informationhttps://dailymed.nlm.nih.gov/dailymed/search.cfm?query=clomiphene
- ASRM ReproductiveFacts: Medications for inducing ovulation (patient booklet)https://www.reproductivefacts.org/news-and-publications/fact-sheets-and-infographics/medications-for-inducing-ovulation/
- ASRM ReproductiveFacts: Ovarian hyperstimulation syndrome (OHSS)https://www.reproductivefacts.org/news-and-publications/fact-sheets-and-infographics/ovarian-hyperstimulation-syndrome-ohss/
- MedlinePlus: Clomiphenehttps://medlineplus.gov/druginfo/meds/a682704.html
EasySTD is an information and comparison directory, not a healthcare provider. This tool is general information based on the published prescribing information and ASRM patient guidance: it is not medical advice, a diagnosis, or a prescription, and it does not create a doctor-patient relationship. Take Clomid only as prescribed, with the monitoring your clinic arranged.
Good to Know
Clomid timing: frequently asked questions
When ovulation happens, how the protocols differ, how to time intercourse and tests, what your clinic checks, and which symptoms mean call now.
When will I ovulate on Clomid?
Typically 5 to 10 days after your last tablet — that's the window in the clomiphene prescribing information, and it's why this tool shows a range rather than a single day. On a days 3–7 protocol the last tablet is cycle day 7, so ovulation is expected around cycle days 12–17; on days 5–9 it shifts to roughly days 14–19. Where you land inside that window varies from person to person and cycle to cycle. Ovulation predictor kits, a monitoring ultrasound, or a progesterone blood test are how the window gets narrowed to an actual day — the calendar alone can't do that.
Days 3–7 or days 5–9 — which is better?
That's your prescriber's call, and this calculator deliberately never makes it. Both are widely used, along with days 2–6 and 4–8, and research hasn't crowned one start day as clearly superior — clinics choose based on your cycle, your history, and their own protocol. What matters for timing is simply which days you were actually told to take the tablets, because the ovulation window is anchored to your last tablet. If the days on your prescription label don't match what you selected here, fix the selection — and if you're not sure what was ordered, call your clinic before taking anything.
When should we have intercourse?
Unless your clinic gave you a specific plan, a common approach is intercourse every 1–2 days across the ovulation window — starting a couple of days before the earliest expected day, since sperm can survive several days and the egg only about a day. That's why this tool suggests a window that opens just before the 5-day mark after your last tablet and runs through the 10-day mark. If your cycle involves a trigger shot, an IUI, or specific timing instructions from your clinic, follow those exactly — clinic instructions always override a calendar estimate.
How will my clinic know whether the cycle worked?
Two common checks. Some clinics do a mid-cycle ultrasound a few days after your last tablet to measure the growing follicle and confirm the response. Many also draw a progesterone blood test about a week after presumed ovulation — the classic 'day 21' test in a cycle with days 3–7 tablets — because a raised progesterone confirms you actually ovulated. This monitoring matters: it tells your prescriber whether the current plan is working or needs to change, and the prescribing information advises against simply continuing cycle after cycle without review — generally not beyond a total of about six cycles (including three ovulatory cycles), per the FDA label.
Which side effects mean I should call my prescriber right away?
Two stand out. First, any visual disturbance — blurring, spots, flashes, or afterimages: stop taking the tablets and contact your prescriber, because the prescribing information advises discontinuing when visual symptoms appear. Second, severe pelvic or abdominal pain, rapid bloating or weight gain, nausea and vomiting, or shortness of breath can signal ovarian hyperstimulation syndrome (OHSS), which needs prompt medical attention — call your clinic or seek urgent care. Milder effects like hot flashes, mood swings, breast tenderness, and headaches are common and usually manageable, but mention them at your next visit.
Is what I enter private?
Yes. This tool runs entirely in your browser. The dates you enter are used on your own device and are never sent to a server, saved, or shared — close the tab and they're gone. In a post-Dobbs world we treat reproductive and fertility data as sensitive by default. It's a timing helper based on the published prescribing information, not medical advice, a dose recommendation, or a substitute for your clinic's instructions.
Have a different question? Browse the full pregnancy FAQ library, every question we answer, in one place.