Calculator inputs
Estimate the next ovulation date from the first day of the last period and average cycle length.
Enter the first day of the last period used for this estimate.
Average number of days from the first day of one period to the first day of the next.
Formula
A 28-day cycle starting on 2026-04-01 suggests ovulation around 2026-04-15.
How to use it
Estimate the next ovulation date from the first day of the last period and average cycle length. This page keeps the steps simple, shows the core formula, and links to closely related tools so users can keep comparing scenarios.
Ovulation Calculator FAQ
What does this calculator estimate?
Estimate the next ovulation date from the first day of the last period and average cycle length.
How should I read the result?
The result is a quick planning estimate based on the formula shown above.
Where should I go next?
Use the related links to compare adjacent calculators or open the category hub.
Accuracy and use of results
CalculatorWorks aims to make calculations clear and practical. We use standard calculation methods where possible, explain assumptions in plain language, and encourage users to verify important results before relying on them.