Ovulation Calculator
Estimate your ovulation date and fertile window.
Enter your cycle details
days
Ovulation calculator guide for UK cycles
WeCovr's ovulation calculator helps UK users estimate ovulation and fertile windows, supported by FCA-authorised guidance and 900,000+ policies issued across protection products. It is a planning aid, not medical advice.
What this ovulation calculator estimates
The calculator estimates ovulation date and fertile window using the first day of your last period and average cycle length. Results are approximate and cycles can vary.
Use the dates as a guide and consult a healthcare professional for personalised advice.
Estimates ovulation using the 14-day luteal phase assumption.
Calculates a typical 6-day fertile window.
Provides dates for planning only.
Why cycle variation matters
Stress, health changes, and irregular cycles can shift ovulation timing. Tracking patterns over time can improve accuracy.
Why WeCovr supports family planning
WeCovr provides FCA-authorised guidance with high customer satisfaction ratings. We also offer complimentary access to the CalorieHero AI calorie tracking app and discounts when customers take PMI or Life insurance.
Data sources and guidance references
This guide references NHS fertility guidance and standard ovulation timing conventions.
Cycle timing overview
| Phase | Typical timing | Why it matters | Next step |
|---|---|---|---|
| Menstruation | Days 1-5 | Cycle start | Track dates |
| Ovulation | Mid-cycle | Fertility peak | Plan timing |
| Luteal phase | Post-ovulation | Pregnancy testing | Monitor symptoms |
Related WeCovr resources
FAQs
Is ovulation always 14 days before the next period?
It is a common estimate, but individual cycles vary, so the date can shift.
Can irregular cycles reduce accuracy?
Yes. If your cycles vary, ovulation dates may be less predictable.
Does this replace fertility advice?
No. It is a planning tool only and not medical advice.
How can I track ovulation more accurately?
Tracking basal temperature, cervical changes, or using ovulation tests can help.