Calculator
Ovulation calculator
Estimate ovulation day, the fertile window and the next period from your cycle length.
This calendar estimate uses cycle length. It is not a hormone test or ultrasound.
Calculate
Result
Enter the details and press Calculate. The result will appear here.
How to use it
- Enter the first day of your last period and typical cycle length.
- The tool estimates ovulation and a fertile window.
- It also suggests the next period date.
Points to watch
- Irregular cycles make calendar estimates less reliable.
- The tool does not confirm pregnancy and does not replace contraception advice.
Frequently asked questions
Is this a fertility test?
No. It is a calendar estimate. Ovulation tests or clinical follow-up are different methods.
What cycle length should I enter?
Use the length you usually see, often counted from the first day of one period to the first day of the next.
Source and method note
Calendar methods are estimates only. They do not replace medical assessment.
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