Using a pregnancy test calculator is easy and simply requires inputting individual data including the date of the woman's last period as well as the typical length of the menstrual cycle, reports WebMD and BabyMed. Pregn... More »

A pregnancy due date calculator calculates a due date by counting 40 weeks from the day that the last menstrual period started, according to BabyCenter. This method assumes that conception occurred two weeks after the la... More »

To use most period calculators, simply enter the date of your last menstrual period, how long your periods typically last and the length of your cycle, as evidenced by the period calculator created by Kotex. The calculat... More »

A conception calculator is a simple method of estimating the gestational age of a pregnancy by placing the date of conception at the first day of the mother's last menstrual period, explains BabyMed. It is impossible to ... More »

To determine the date of conception, use an online ovulation calculator found on WebMD or BabyMed. Alternatively, women can identify the last menstrual period that they have had and add 40 weeks to determine due date, wh... More » Health Women's Health Pregnancy

A woman can estimate a pregnant woman’s due date by using an ultrasound test, measuring the size of the uterus and determining the first day of the woman’s last menstrual period, states WebMD. Most women’s due dates are ... More »

If pregnancy is a possibility, a pregnancy test is the first step to take when a period is six days late, according to Summit Medical Group. A menstrual period is considered late any time it is more than five days overdu... More »