Health & Fitness Tools / Ovulation Calculator
Ovulation Calculator
Estimate your most fertile days based on your cycle.
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Ovulation Calculator
Estimate your most fertile days based on your cycle.
Estimate only, based on average cycle timing. Individual cycles can vary.
Features
- Estimates fertile window and ovulation day
- Adjustable average cycle length
- Shows next expected period
- 100% free, no signup
How to Use
Step 1
Enter the first day of your last period.
Step 2
Enter your average cycle length.
Step 3
Click Calculate Fertile Window to see your results.
About This Tool
Ovulation Calculator estimates your fertile window and likely ovulation day based on the start of your last period and your average cycle length, along with your next expected period.
Frequently Asked Questions
How is ovulation day estimated?
It is generally estimated as 14 days before your next expected period, based on your typical cycle length.
Does this work for irregular cycles?
It works best with a fairly consistent cycle length; very irregular cycles are harder to estimate accurately with this method alone.