Clomid Ovulation Calculator

Estimate ovulation timing and fertile window during a Clomid treatment cycle from your LMP and treatment protocol (CD3 or CD5 start).

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Treatment Details

CD3 and CD5 are the two most common Clomid protocols.

21 days45 days

Enter the first day of your last period to see your Clomid schedule.

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Health — Fertility

Clomid Ovulation Calculator

Clomiphene citrate (Clomid) stimulates ovulation by blocking oestrogen receptors in the hypothalamus, triggering a surge in follicle-stimulating hormone (FSH). Ovulation typically occurs 5–10 days after the last tablet. This calculator estimates your Clomid schedule, ovulation window, fertile days, and timed intercourse guidance from your last menstrual period and treatment protocol.

CD3 vs CD5 protocol

Clomid is most commonly prescribed starting on cycle day 3 (CD3) or cycle day 5 (CD5) and taken for 5 consecutive days. The CD3 protocol may produce a slightly higher number of follicles, while the CD5 protocol is sometimes preferred for its potentially better uterine lining response. Your fertility specialist will advise which suits your situation.

Ovulation monitoring via ultrasound (follicular tracking) or ovulation predictor kits (OPKs) is recommended during Clomid cycles to confirm the exact timing and guide intercourse or intrauterine insemination (IUI).

Timed intercourse guidance

Regular intercourse every 1–2 days throughout the fertile window maximises the chance of sperm being present at ovulation. Sperm can survive in the reproductive tract for up to 5 days, while the ovum is viable for approximately 12–24 hours after release.

Clomid cycles are typically monitored with mid-cycle ultrasound to measure follicle size. A trigger injection (hCG) may be used to time ovulation precisely when follicles reach 18–22 mm.

Frequently asked questions

What if I do not ovulate on Clomid?

About 80% of Clomid patients ovulate, but only around 40–50% conceive within six cycles. If you do not ovulate or do not conceive after 3–6 Clomid cycles, your specialist may suggest increasing the dose, switching to letrozole, or considering IUI or IVF.

 Is it safe to use Clomid without medical supervision?

No. Clomid requires medical prescription and monitoring for ovarian hyperstimulation, multiple follicle development, and uterine lining adequacy. Do not take Clomid without the guidance of a licensed fertility specialist.

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