Clomid Ovulation Calculator — Clomiphene Cycle Dates
Estimate when you will ovulate and your most fertile days during a Clomid (clomiphene citrate) treatment cycle.
First day of last period
Clomid protocol
Estimated peak: Tue, Jul 14, 2026
- 1
Days from period start to Clomid start
Day 3 − 1 = 2 - 2
Clomid course (days after start)
5 pills − 1 = 4 - 3
Days after last pill to peak ovulation
7 - 4
Total days to peak ovulation
2 + 4 + 7 = 13From the first day of your last period to estimated peak ovulation.
How does this calculator work?
On a Clomid (days 3–7) cycle, take 5 pills starting on day 3; on a days 5–9 cycle, start on day 5. Ovulation is expected about 5–10 days after the last pill (peak ~day 7 post-pill), placing it roughly on cycle day 14–17 for protocol 3–7 or 16–19 for protocol 5–9. The fertile window runs from 5 days before peak ovulation through the day after.
Formula
How this is calculated
Clomid (clomiphene citrate) stimulates the pituitary gland to release more FSH and LH, triggering follicle development and ovulation. It is typically prescribed as a 5-day course starting on either cycle day 3 or cycle day 5, where cycle day 1 is the first day of the menstrual period. Both protocols produce similar pregnancy rates; days 3–7 may stimulate more follicles while days 5–9 may better support a single dominant follicle.
After the last pill, the LH surge and ovulation generally occur within 5–10 days, with the median around 7 days post-pill. The calculator projects the clomid start date (LMP + protocol start day − 1), adds 4 days to find the last pill date, and then estimates the ovulation window as 5–10 days after that. The fertile window — the period when intercourse has the best chance of leading to conception — spans from 5 days before peak ovulation through 1 day after, reflecting that sperm survive in the reproductive tract for up to about 5 days and the egg lives roughly 24 hours.
These are population-level estimates. Individual response to Clomid varies significantly, and actual ovulation should be confirmed with an ovulation predictor kit (LH surge test), basal body temperature tracking, or transvaginal ultrasound monitoring under your doctor's supervision.
Frequently asked questions
Both are 5-day courses and have similar overall pregnancy rates. Days 3–7 starts earlier in the cycle and may stimulate more follicles to mature; days 5–9 starts later and may better support a single dominant follicle. Your fertility specialist will recommend the most appropriate protocol for your situation.
Most people ovulate 5–10 days after the last pill, with the peak commonly around day 7 post-pill. On the days 3–7 protocol that is roughly cycle days 12–17; on days 5–9 it is roughly cycle days 14–19.
Yes — ovulation predictor kits (OPKs) detect the LH surge that precedes ovulation by 24–48 hours and generally work normally alongside Clomid. Basal body temperature (BBT) charting can also confirm that ovulation occurred after the fact. Your doctor may additionally use ultrasound monitoring to count and measure follicles.
TG we-Calculate Editorial Team. (2026). Clomid Ovulation Calculator — Clomiphene Cycle Dates [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/clomid-ovulation-calculator
TG we-Calculate Editorial Team. "Clomid Ovulation Calculator — Clomiphene Cycle Dates." TG we-Calculate. 2026. https://we-calculate.com/calculator/clomid-ovulation-calculator.
TG we-Calculate Editorial Team, "Clomid Ovulation Calculator — Clomiphene Cycle Dates," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/clomid-ovulation-calculator
@misc{wecalculate_clomid_ovulation_calculator, title = {Clomid Ovulation Calculator — Clomiphene Cycle Dates}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/clomid-ovulation-calculator}}, year = {2026}, note = {TG we-Calculate} }
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