Pregnancy & Baby Calculators: Due Dates and Growth

Use these pregnancy and baby calculators to estimate key dates, understand pregnancy milestones, and follow early childhood growth. If you’re trying to conceive, explore Calendar of Ovulation and Fertility, Fertile Days and Ovulation, and Date of Conception. During pregnancy, Pregnancy Due Date, Gestational Age Calculator (AOG), and Weekly Pregnancy Weight Gain can help you plan and track progress.After birth, Infant Feeding Volume, Child Height and Weight, and Child Development Tracker offer practical reference points for parents and caregivers. Results are estimates, not medical advice; consult a healthcare professional about pregnancy, feeding, or development concerns.

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Newborn Weight Loss

Enter your baby's birth weight and current weight to see how many grams (or pounds) and what percentage of birth weight your newborn has lost or gained, and whether the change is within the normal range.

Nutrition Needs for Infants Under 1 Year

Estimate an infant’s weight, length, and daily energy and nutrient amounts from birth weight, birth length, and age in months.

Child Height and Weight

Compare a child’s height and weight with age- and sex-specific reference ranges from birth to 5 years. Enter their age, weight, and height to see categories and a growth chart; this calculator does not report exact percentiles.

Formula Powder

Work out exactly how much water and how many scoops of formula powder you need to prepare one bottle or a whole day's worth. Enter the bottle volume, number of bottles and the mixing ratio from your formula can.

Infant Feeding Volume

Estimate an infant’s daily feeding volume, feedings per day, and a sample schedule. Enter age in months, feeding type, weight in grams, and an optional first feeding time.

Height Predictor

Estimates your child's adult height using three methods: mid-parental height, Khamis–Roche (ages 4–17), and the double-height-at-age-2 rule. Enter the parents' heights, the child's sex, age, height and weight to see the predictions.

Baby Eye Color

Select both parents’ eye colors to see the calculator’s two lookup-table outcomes. These are simplified illustrations, not reliable probabilities for your baby’s eye color.

Child Development Tracker

Select your child’s sex and age to see reference weight and height values. The calculator also asks for birth weight and birth height, but these do not change the results.

Infant Growth Velocity

Calculate your baby's growth velocity: enter two weighings (and optional lengths) with their dates to get weight gain per day and per week, plus length gain per month.

Fetal Weight Estimate

Estimate fetal weight from three routine ultrasound measurements — head circumference, abdominal circumference and femur length — using the Hadlock formula. Enter values in mm or cm and get the result in grams, kilograms and pounds.

Apgar Score

Score a newborn's condition at 1 and 5 minutes after birth using the five Apgar signs: Appearance, Pulse, Grimace, Activity and Respiration. Select a value from 0 to 2 for each sign and get the total score with its interpretation.

Corrected Age

Enter your baby's birth date and gestational age at birth to find the corrected (adjusted) age on any date. This tool subtracts the weeks your baby was born early from the chronological age.

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Gestational Age Calculator (AOG)

Estimate gestational age in weeks and days and an expected delivery date. Enter the first day of your last menstrual period and your usual cycle length.

Crown Rump Length (CRL)

Estimate crown–rump length from a gestational age of 6 to 14 weeks. Enter the number of weeks and choose millimeters or centimeters.

Find Your Due Date

Enter the first day of your last menstrual period to estimate your due date, conception date, fertility dates, and 12- and 27-week pregnancy milestones.

Ultrasound Gestation Period

Enter an ultrasound crown–rump length of 3–84 mm to estimate gestational age in weeks and days. The result is an approximate pregnancy term, not a clinical dating assessment.

Pregnancy Due Date

Enter the first day of your last menstrual period and your usual cycle length to estimate your due date and conception date.

How Many Weeks Pregnant Are You?

Enter the first day of your last menstrual period and your usual cycle length to estimate how many weeks pregnant you are, your due date, and the time remaining until that date.

Weekly Pregnancy Weight Gain

Estimate a pregnancy weight-gain range for your current week using your height, pre-pregnancy weight, current weight, and week of pregnancy.

Contraction Timer

Log the start and end times of up to six contractions and instantly see how long each one lasts, how far apart they are, and whether they match the 5-1-1 labor pattern.

Milk Stash

Estimate how many days your frozen breast milk stash will last based on how much milk you have stored, how much your baby drinks per day, and how much you plan to pump.

IVF Due Date

Estimate an IVF due date from an embryo transfer, egg retrieval, or fertilization date. Choose your IVF method and enter the relevant date to see your due date and pregnancy milestones.

Kick Count

Track your baby's movements with the 'count to 10' method. Enter the time you started counting and each movement as you feel it — the calculator shows how many kicks you've recorded and how long it took to reach 10.

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Safe Days

Enter the first day of your last menstrual period, your cycle length, and your menstruation duration to see a calendar of estimated menstrual, fertile, and lower-fertility days. No day is guaranteed safe from pregnancy.

Fertile Days and Ovulation

Enter the first day of your last menstrual period and your average cycle length to estimate your ovulation date and the dates two days before and after it.

Implantation Date

Estimate when a fertilized egg is most likely to implant in the uterus. Enter your ovulation or conception date to get your implantation window of 6–12 days past ovulation.

Date of Conception

Estimate a conception date from the first day of your last menstrual period, your cycle length, and the length of the second part of your cycle. The displayed date may be one month later than the intended estimate.

Period

Estimate your next period date and upcoming cycles. Enter the first day of your last period, your average cycle length, period length, and how many cycles to show.

Pregnancy Test Date

Find out the best day to take a home pregnancy test. Enter your ovulation date (or expected period date) and your luteal phase length to get your earliest and most accurate testing dates.

Motile Sperm Count

Enter semen volume, sperm concentration, and total motility from your semen analysis report to get your total motile sperm count (TMSC) and what it means for natural conception, IUI, and IVF.

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Pregnancy Gestational Diabetes Diet

Estimate BMI, pregnancy weight-gain range, basal metabolic rate, and daily calories from your height, weight, age, and exercise level. The results are starting points for discussion with your pregnancy care team.

Amniotic Fluid Index

Enter the deepest vertical amniotic fluid pocket measured in each of the four quadrants of the uterus, and this calculator returns your Amniotic Fluid Index (AFI) in cm along with its clinical classification.

hCG Doubling Time

Enter two hCG blood test results with their dates and times to find how fast your hCG is rising. The calculator shows the percentage change, the doubling time in hours and days, and the minimum rise expected in 48 hours.

Bishop Score

Enter the five findings of a cervical examination — dilation, effacement, station, consistency and position — to get the total Bishop score and an interpretation of how favorable the cervix is for induction of labor.

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Child Gender by Blood Renewal

Enter both parents’ birth dates and a conception date to see a traditional blood-renewal prediction. The result is for entertainment and cannot determine a baby’s sex.

Chinese Baby Gender

Enter the mother’s age and month of conception to see the Chinese gender chart’s boy-or-girl prediction. This is a traditional chart lookup, not a medical prediction.

Child Gender by Parent Blood Type

Select numbers 1–4 for each parent to see the calculator’s traditional boy-or-girl result. Parent blood types cannot predict a baby’s sex, so use the result for entertainment only.

Child Gender by Rh Factor of Parents

Select each parent’s positive or negative Rh factor to see the calculator’s traditional male-or-female prediction. Rh factors cannot actually predict a child’s sex.