Questions and answers
Ovulation calculator FAQ
How is ovulation estimated?
The calculator counts backward from the expected next period using your selected luteal-phase length. It is an estimate, not a measurement.
Can I use it with irregular cycles?
You can, but calendar results may be less reliable. Consider tracking additional signs and speaking with a clinician.
Does the site store my dates?
If you choose Remember my details on this device, your calculator inputs are stored only in this browser’s localStorage and are never sent to our server. You can use Forget my data or clear site data to remove them. Read the privacy policy for details.
Can the calculator prevent pregnancy?
No. Calendar estimates are not contraception. Use a method recommended by a qualified healthcare professional.