Baby & Parenting Calculators
APGAR Score Calculator
Calculate a newborn's APGAR score from Appearance, Pulse, Grimace, Activity, and Respiration, with the full scoring criteria and interpretation table.
Baby Age in Months Calculator
Calculate a baby's precise age in months, weeks, and days from a birth date using calendar-aware math, useful for vaccine and milestone scheduling needs.
Baby BMI Calculator
Calculate an infant's BMI from weight and length, for comparison against pediatric growth chart percentiles.
Baby Growth Percentile Calculator
Estimate a baby's length or height percentile for age and sex using a simplified WHO growth standards approximation, with a median reference table shown.
Baby Length Velocity Calculator
Calculate a baby's length growth rate in centimeters per month between two measurements.
Baby Sleep Schedule Calculator
Look up recommended total sleep and typical nap count by age band from newborn through preschool age, based on standard pediatric sleep guidelines.
Baby Weight Gain Rate Calculator
Calculate a baby's average daily weight gain rate between two measurements to compare against typical age-based ranges.
Baby Weight Percentile Calculator
Estimate a baby's weight percentile for age and sex using a simplified WHO growth standards approximation, with a full reference table of median weights.
Breastfeeding Frequency Calculator
Look up recommended breastfeeding frequency and the resulting approximate interval between feeds by age band, from newborn through 12 months old.
Child Height Predictor Calculator
Predict a child's adult height from both parents' heights using the mid-parental height method, with a worked example and likely height range shown.
Corrected Age for Premature Baby Calculator
Calculate a premature baby's corrected (adjusted) age for comparing growth and development against standard full-term growth charts.
Diaper Usage Calculator
Estimate diaper usage over any number of days based on age-appropriate daily ranges, from newborn through toddler, with full weekly totals included.
Due Date Calculator
Estimate a pregnancy due date from the last menstrual period using Naegele's Rule, with current gestational age and trimester milestones fully explained.
Expected Teeth by Age Calculator
Get a rough estimate of how many primary teeth a baby typically has by a given age, using a commonly cited pediatric dental rule of thumb.
Expected Weight Gain Reference Calculator
Find the commonly cited typical daily and weekly weight gain range for a baby's age, for comparison against your own measurements.
Formula Calorie Calculator
Calculate total calories provided by a given volume of standard-concentration infant formula.
Formula Feeding Calculator
Estimate daily and per-feed formula amounts from a baby's weight and feeding frequency, using the standard 2.5 oz per pound guideline with a worked example.
Head Circumference Growth Rate Calculator
Calculate a baby's head circumference growth rate between two measurements, a key indicator tracked at well-baby visits.
Newborn Weight Loss Percentage Calculator
Calculate the percentage of weight a newborn has lost since birth, and compare it against commonly cited normal ranges.
Tummy Time Duration Calculator
Get a general guideline for recommended total daily tummy time based on a baby's age in months.
Tracking Growth With Real Numbers
The early months of a baby's life come with a lot of numbers to track — weight, height, feeding frequency, sleep patterns — and comparing them to standard growth references is one of the most common questions new parents have. These ten calculators handle that math.
What a Growth Percentile Actually Means
A baby at the 60th percentile for weight is heavier than 60% of babies of the same age and sex in the reference population — it says nothing about whether that is "good," only where the baby sits relative to a broad reference group. A baby tracking steadily along the 25th percentile month after month is generally considered to be growing normally for their own pattern. What typically prompts closer pediatric attention is not the percentile number itself, but a sudden drop across multiple percentile lines — say, from the 60th to the 15th in two months.
Track your own numbers with the Baby Weight Percentile Calculator and Baby Growth Percentile Calculator, and bring the trend — not just a single reading — to your pediatrician. Growth patterns can also differ somewhat between breastfed and formula-fed infants in the first year, one more reason to interpret results alongside your pediatrician rather than in isolation.
Popular Baby & Parenting Calculators
- Due Date Calculator — estimates delivery date from last menstrual period or conception date.
- APGAR Score Calculator — totals the standard five-category newborn assessment score.
- Baby Sleep Schedule Calculator — suggests age-appropriate nap and bedtime windows.
Still expecting? See the Pregnancy Calculators, or check broader family health tools in Health Calculators.