Pregnancy Calculators: Due Date, Ovulation and Weight Gain
These calculators turn dates and measurements into the numbers expecting parents ask about most: an estimated due date, the likely fertile window and recommended weight gain. They follow standard obstetric conventions such as counting 40 weeks from the first day of the last period. They are estimates for planning and do not replace advice from your doctor or midwife.
7 free pregnancy calculators
Pregnancy Calculator
How far along you are, trimester and due date, from your last period.
Open calculator →Pregnancy Weight Gain Calculator
Recommended total weight gain range for your pre-pregnancy BMI.
Open calculator →Pregnancy Conception Calculator
Given a due date, estimate when conception likely occurred.
Open calculator →Due Date Calculator
Estimated due date from your last period or conception date.
Open calculator →Ovulation Calculator
Predicted ovulation date, fertile window and next period.
Open calculator →Conception Calculator
Most likely conception date and fertile window.
Open calculator →Period Calculator
Predicted upcoming period dates from your cycle length.
Open calculator →Frequently asked questions
How accurate is an estimated due date?
Only about 5% of babies arrive on the exact due date; most are born within two weeks either side. Your doctor may adjust the date after an ultrasound.