Ovulation Calculator
Estimate ovulation by subtracting the luteal-phase length from your usual cycle length. This is educational timing information, not contraception or a guarantee of fertility.
Ovulation Calculator
Estimate ovulation by subtracting the luteal-phase length from your usual cycle length. This is educational timing information, not contraception or a guarantee of fertility.
Method and assumptions
Figur applies straightforward arithmetic to the values you enter. The calculation runs locally in your browser and is not stored.
- The result depends on accurate inputs and units.
- External factors, fees, taxes, or rules not requested by the calculator are not included.
- Use the result as a planning estimate and verify any high-stakes decision.
Sources and references
No external data source is required: this calculator uses standard arithmetic and the values you enter.
Frequently asked questions
Can I use this to prevent pregnancy?
No. Ovulation can vary; use a reliable contraceptive method and speak with a clinician for guidance.
What is the fertile window?
Sperm can survive for several days, so conception may be possible in the days before and around ovulation.