Predict your next period, fertile window, and ovulation date based on your cycle data.
Next Period Start:
Ovulation Date:
Fertile Window:
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About This Tool

This calculator helps predict your next period based on your cycle length and last period start date. It also estimates ovulation and fertile window, useful for family planning or tracking menstrual health.

How It Works

Enter your last period date and average cycle details. The tool calculates your next expected period by adding the cycle length, estimates ovulation 14 days before the next period, and marks the 5-day fertile window leading to ovulation.

Advice & Tips

Use this tool as an estimate. Periods may vary due to stress, health, or lifestyle changes. Track over multiple cycles for better accuracy.

FAQs

Can this predict irregular cycles? It works best for regular cycles. Irregular cycles reduce accuracy.
Is ovulation date exact? It's approximate; fertility can vary.
Is this free? Yes, completely free to use.