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Period and Ovulation Calculator

This calculator uses the date of your last period and cycle length to predict your next period and ovulation days.
First Day of Your Last Period
How long did it last?
Average Length of Cycles
Your Estimated Next Period Date
Probable Ovulation Day
Fertility Window
Calculate
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By proceeding with this tool, you must be 18 or older, and you agree to let Lovense process your information to generate cycle estimates. Results are approximate and not for pregnancy prevention.
NOTE: This tool can only predict, not determine exact dates. Stress, travel, sleep, sickness, or hormonal and postpartum changes can interrupt cycles, so use these findings as an estimate and monitor over several months for the clearest trend.
Why track your period and ovulation?
  • Forecast period dates better
  • Find your most fertile time
  • Understand cycle inconsistencies across time
  • Plan pregnancy or avoid fertile days naturally
  • Recognize mood, energy, or symptom patterns
FAQ
How do you calculate a menstrual cycle?
A menstrual cycle is counted from day 1 of your period to the day before your next period starts, on average about 28 days. You can estimate menstruation and ovulation faster using our calculator.
When will I start ovulating?
Most women ovulate 14 days before menstruation. For those with 30-day cycles, they usually ovulate around day 16 of their cycle.
Does this calculator calculate accurately?
Yes. You can get pregnant from sex up to 5 days before ovulation. This is because sperm can survive inside the body for that long, waiting for an egg. Your most fertile days are the 2–3 days immediately before ovulation.
Can I get pregnant before ovulation?
It's tougher to estimate ovulation timing if your periods are irregular. Instead, you can try tracking symptoms like cervical mucus changes or use ovulation testing.

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