How do ovulation calculators work out your most fertile period?

Fertility calculators help to estimate the day of ovulation and, therefore, the days when you are most likely to get pregnant. However, these types of tools are more accurate when the menstrual cycle is regular.These calculators should not be used as a method of contraception.
Egg and sperm donation magazine

9 Symptoms Of Ovulation To Help Predict Your Most Fertile Time

Ovulation Calculator

Ovulation Calculator & Calendar: Identify Your Fertile Days

Your ovulation, explained: Signs, Timeline, and Fertility – Fertility Glo

How to Determine Your Most Fertile Day to Conceive: 7 Steps

Period Calculator, Calculate Your Period Cycle

When are you most fertile?

How do ovulation calculators work out your most fertile period?

Ovulation Calculator - Calculate When You Are Most Fertile – BabyHopes

Ovulation Calculator : Estimate your most fertile days - Clearblue