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Calculate Sales tax US

Sales Tax States, to calculate sales tax of US States, city and zip code.


Ovulation calculator

Calculate the fertility period and ovulation date

Free ovulation calculator. Get the fertility date range with the date of ovulation. Simply enter your menstrual cycle length as well as the last date of your first day of menstruation (periods) to maximize the potential to become pregnant.

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The first day of your fertility period is: Variable start date until one day after ovulation: Variable end date.

How to know the date of ovulation

Ovulation usually takes place 14 days before the end of the menstrual cycle. It is therefore necessary to subtract 14 days from the last day of this cycle.

Ovulation calculation formula

Date of ovulation = First day of last menstruation + Days of menstrual cycle - 14 days

The spermatozoon

The spermatozoon, being one of the key element of fertilization of the egg has a lifespan of 3 to 5 days

The spermatozoon swimming velocity varies according to the studies from 10 to 162 um or 0.0001 cm to 0.00162 cm per second, ie 3600 seconds per hour = 0.36 to 5.832 centimeters per hour and must travel from 10 to 17 centimeters it takes about 2 to 48 hours to reach the egg.

The ovum

The egg is produced about 14 days before the end of the periods. The latter has a lifespan of approximately 12 to 24 hours.

Fertility period

The fertile window must therefore take into account all the preceding variables: the day of ovulation, the lifespan and the travel duration of the sperm and the lifespan of the egg.

Fertility period formula

Fertility start date = Ovulation day - maximum sperm life

The start date is therefore estimated at a maximum of 5 days before ovulation

Fertility end date = Ovulation day + maximum egg lifespan - spermatozoon travel time

The end date is therefore estimated at a maximum of 1/2 day before ovulation . For simplified calculation purposes, the calculator will give 1 day after ovulation


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