Ovulation Calculator | Fertile Window & Best Days to Conceive

Find Your Most Fertile Days

Estimate ovulation date, fertile window, and next period using cycle-based planning.

First day of your last period

Average cycle length (days)

Most cycles are between 26 and 32 days. Default is 28.

Average period length (days)

Typical period length is 3 to 7 days.

This calculator is an estimation tool and does not replace medical advice.

Menstrual phase

The period begins and hormone levels reset for a new cycle.

Follicular phase

The egg matures gradually and fertility starts rising.

Ovulation phase

The egg is released. This is the highest fertility period.

Luteal phase

The body prepares for pregnancy, then period starts if no pregnancy occurs.

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How does the ovulation date get calculated?

The estimate is based on cycle length. Ovulation is usually around 14 days before the next period.

Is this calculator accurate for irregular cycles?

It gives a useful estimate, but irregular cycles may need ovulation tests and clinical advice for better accuracy.

What are the best days to conceive?

The highest chance is usually 1-2 days before ovulation and the ovulation day itself.

Can I use this to avoid pregnancy?

No. This tool is for planning awareness only and should not be used as a sole contraception method.