Pregnancy Calculator

  • Conception Date Calculator
    Estimate your conception date and fertile window from a due date, ultrasound, last period (LMP), or birth date using the standard 266/280-day obstetric convention.
  • Pregnancy Week Calculator
    Find your gestational age in weeks and days on any date, calculated from your last menstrual period (LMP) or estimated due date (EDD).
  • Due Date Calculator from Last Menstrual Period
    Estimate your pregnancy due date from the first day of your last menstrual period (LMP) using the standard 280-day / 40-week rule (Naegele's rule).
  • Ovulation Calculator
    Calculate your ovulation date with this Ovulation Calculator. Input your last period start date and average cycle length to determine fertile days and plan for conception or contraception effectively.
  • Breastfeeding Calorie Calculator
    Estimate how many calories you need per day while breastfeeding. Uses Mifflin-St Jeor BMR, your activity level, and a lactation calorie add.
  • Due Date Calculator
    Calculate your due date accurately with this due date calculator. Input your last period and cycle length to determine your expected delivery date. Plan for your baby's arrival with precision.
  • Bishop Score Calculator
    Calculate the Bishop Score (0–13) for cervical ripeness from dilation, effacement, station, consistency, and position to assess labor induction success.
  • Birth Weight Percentile Calculator
    Calculate a newborn's birth weight percentile and z-score for gestational age and sex using normal-distribution reference values.
  • Diaper Calculator
    Free diaper calculator estimates how many diapers your baby needs over any period and the total cost based on diapers per day and price per diaper.
  • Baby & Toddler Sleep Needs Calculator
    Find how many hours of sleep your baby or toddler needs by age. Get total daily sleep plus a suggested night-sleep target based on nap hours.
  • Baby's Milk Intake Calculator
    Estimate your baby's daily milk or formula intake by weight. Calculate mL per day and per feed using the standard 100-200 mL/kg/day guideline.
  • Baby Height Predictor Calculator
    Predict your child's adult height from the parents' heights using the mid-parental height formula. Estimate boys and girls in centimeters instantly.
  • Baby Formula Calculator
    Estimate how much infant formula your baby needs per day and per feed based on body weight. Quick, simple guide for parents and caregivers.
  • Baby Eye Color Predictor Calculator
    Predict your baby's eye color probabilities (brown, green, blue) from both parents' eye colors using a simplified Mendelian genetics model.
  • Baby Age in Weeks and Months Calculator
    Find your baby's age in weeks, days and whole months from their date of birth. Quick, accurate infant age calculator for any "as of" date.
  • Baby Age Calculator
    Calculate a baby's exact age in total days, weeks, weeks-plus-days, and calendar months-plus-days from birth date to any as-of date.
  • Animal Gestation Due Date Calculator
    Estimate the due, birth or hatch date of cows, pigs, sheep, goats, horses, dogs, cats and more from a breeding date, or work backward to find a breeding date.
  • Pregnancy Test Timing Calculator
    Find out the earliest day to take a reliable pregnancy test (14 days after ovulation) and estimate how many weeks pregnant you may be.
  • APGAR Score Calculator
    Calculate a newborn's APGAR score (0-10) from five signs: Appearance, Pulse, Grimace, Activity and Respiration. Quick clinical assessment tool.
  • Gestation Calculator
    Estimate the due date by adding a gestation period (in days) to the conception date. Works for humans and animals with custom gestation lengths.
  • Twin Pregnancy Weight Gain Calculator
    Estimate recommended total and weekly weight gain for a twin pregnancy based on your pre-pregnancy BMI, using IOM guideline ranges.
  • Endotracheal Tube Size Calculator
    Estimate pediatric endotracheal tube (ETT) internal diameter and oral insertion depth by age using the cuffed and uncuffed age-based formulas.
  • Exclusive Pumping Calculator
    Estimate how much breast milk to pump per session and per day for an exclusively pumped baby, based on weight and number of pumping sessions.
  • Reverse Due Date Calculator
    Work backward from a due date to estimate your conception date and last menstrual period (LMP). Free reverse due date calculator using a 280-day pregnancy.

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