How to interpret this estimate

Estimate ovulation timing for a regular menstrual cycle. Estimates ovulation at approximately 14 days before the next expected period.

When this result is useful

Use it to estimate a likely ovulation date for a regular cycle and compare different cycle lengths.

Common limitations

Irregular cycles, illness, stress, age, breastfeeding, and hormonal conditions can change ovulation timing. This calculator is not a contraceptive method or a fertility diagnosis.

This calculator uses the selected inputs and the fixed formula behind the tool to produce an estimate. Review the units, assumptions, and result labels before using the output for planning.

Health results are screening or planning estimates only. They do not diagnose health status or replace advice from doctors, dietitians, or qualified healthcare professionals.

Read the medical disclaimer for more context.