Enter Period Information
* Typically 21-35 days, with an average of 28 days.
How Ovulation Calculation Works
🌸 What is Ovulation?
Ovulation is the release of an egg from the ovary. It typically occurs 14 days before the next expected period. This calculator estimates the ovulation date based on this principle.
🔶 Fertile Window
The fertile window spans from 5 days before ovulation to 1 day after. Sperm can survive up to 5 days in the female body, and the egg survives about 12-24 hours after ovulation, making this the highest probability period for conception.
🔵 Safe Period
The safe period refers to days outside the fertile window. It is divided into early (from period start to before fertile window) and late (after fertile window to before next period). However, it is not 100% safe, so use this information as a reference only.
⚠️ Important Notice
This calculator provides estimates based on regular menstrual cycles. Ovulation timing can vary due to stress, weight changes, illness, and other factors.
For accurate ovulation tracking, consider using ovulation test kits or consulting a gynecologist.
Do not use this as medical basis for contraception or pregnancy planning.
Frequently Asked Questions
Q. How is the ovulation date calculated?
Ovulation typically occurs 14 days before the next expected period. For example, with a 28-day cycle, ovulation is expected around day 14 from the last period start date.
Q. When is the fertile window?
The fertile window spans from 5 days before ovulation to 1 day after, approximately 6-7 days total. Sperm can survive up to 5 days in the body, and an egg survives about 24 hours after ovulation.
Q. Can I use this with irregular cycles?
This calculator is based on regular menstrual cycles. For irregular cycles, use it as a reference only and consider ovulation test kits or consulting a gynecologist for accurate tracking.
Q. Is the safe period really safe?
The safe period has a relatively lower chance of pregnancy, but it is not 100% safe. Ovulation can vary from predictions, so relying solely on this for contraception is not recommended.