Ovulation & Due Date Calculator
Ovulation & Due Date Calculator estimates your fertile window, ovulation date and potential due date from your last period date and average cycle length.
Última atualização: July 2026
An ovulation calculator estimates when you ovulate and your fertile window based on your last period and cycle length. A typical 28-day cycle ovulates around day 14.
🔒 All calculations run in your browser. Based on average cycle data — not a substitute for medical advice.
Como usar Ovulation & Due Date Calculator
- Enter the first day of your last period.
- Enter your average cycle length (default 28 days).
- Read your estimated fertile window, ovulation date and due date.
Perguntas frequentes
How accurate is this?
It provides estimates based on averages. Individual cycles vary — use it as a guide.
What if my cycle is irregular?
The calculator works best with regular cycles (21–35 days).
Is my data stored?
No — all calculations run in your browser.
calculadoras relacionadas
Date Difference Calculator
Calculate the exact difference between two dates in years, months, days and total days, weeks and hours. Free and instant.
Days Until Calculator
Calculate how many days, weeks, months and hours until (or since) a specific date. Free, instant countdown calculator.
Date Calculator (Add / Subtract Days)
Add or subtract days, weeks, months or years from a date to find the resulting date. Free, instant date calculator.
Calculadora de idade
Calcule a idade exata em anos, meses e dias a partir da data de nascimento — e quanto falta para o próximo aniversário. Grátis.