Ovulation Calculator
Calculate your fertile days and ovulation. For natural family planning.
Note: These calculations are for informational purposes only and do not replace professional tax or financial advice. All information without guarantee.
Frequently Asked Questions
When does ovulation occur?
Ovulation typically occurs about 14 days before the next period. With a 28-day cycle, that is around day 14. Fertile days span approximately 5 days before ovulation through 1 day after.
How can I determine my fertile days?
Methods include tracking basal body temperature, observing cervical mucus changes, using ovulation test strips, and calendar-based calculation. Combining methods increases accuracy.
What is the Ovulation Calculator?
The ovulation calculator determines the fertile days and expected ovulation date based on cycle length.
How does the Ovulation Calculator work?
Enter the first day of your last period and average cycle length. Ovulation occurs approx. 14 days before the next period. The fertile window is about 5 days before to 1 day after ovulation.
Key Data and Facts
Ovulation: approx. 14 days before next period. Fertile days: 5-6 days per cycle. Average cycle length: 28 days (21-35 normal). Sperm survive up to 5 days.
Related Calculators
BMI Calculator
Calculate your Body Mass Index (BMI) and find out if your weight is in the normal range. According to WHO classification.
Calorie Calculator
Calculate your daily calorie needs. Basal metabolic rate and total needs using Harris-Benedict and Mifflin-St Jeor formulas.
Due Date Calculator
Calculate the expected due date of your baby using Naegele's rule.
Pregnancy Week Calculator
Determine your current pregnancy week. With development information about the baby.