Pregnancy Calculator

  • Weeks Pregnant from Conception Date Calculator
    Find out how many weeks pregnant you are based on the conception date. Calculates gestational age in weeks and days from conception to today.
  • Baby Weight Conversion Calculator
    Convert baby weight between pounds & ounces and grams/kilograms instantly. Free two-way birth weight converter using exact conversion factors.
  • How Many Months Pregnant Am I?
    Find out how many months pregnant you are. Enter your last menstrual period (LMP) and today's date to get gestational age in months, weeks and days.
  • Ultrasound Due Date Calculator
    Convert your ultrasound gestational age (weeks + days) into an estimated due date (EDD). Enter the scan date and GA to get your pregnancy due date instantly.
  • Basal Body Temperature (BBT) Ovulation Calculator
    Find your ovulation day and fertile window from basal body temperature. Enter your 6-day baseline and thermal shift day to detect ovulation.
  • Ovulation Date Calculator
    Estimate your ovulation day and fertile window from the first day of your last period and your average cycle length. Free, fast, and easy to use.
  • Naps Needed Calculator
    Estimate how many naps per day are needed from total daytime sleep hours and average nap length. Free, instant nap schedule calculator for babies and adults.
  • Due Date from Ovulation/Conception Calculator
    Calculate your estimated due date (EDD) from your ovulation or conception date by adding 266 days (38 weeks). Fast, free pregnancy date tool.
  • Fertile Window Calculator
    Estimate your most fertile days and ovulation date from your last period and cycle length. Find your 6-day fertile window to plan conception.
  • Total Recommended Pregnancy Weight Gain Calculator
    Estimate your recommended total pregnancy weight gain in kg from your pre-pregnancy BMI using the IOM 2009 guidelines for a single baby.
  • Gestational Age from LMP Calculator
    Calculate gestational age in weeks and days from the last menstrual period (LMP). Enter the LMP date and today's date to get exact pregnancy weeks.
  • How Many Weeks Pregnant Am I?
    Find out how many weeks and days pregnant you are from your last menstrual period (LMP). Enter your LMP and an as-of date to get gestational age instantly.
  • Pregnancy Caffeine Limit Calculator
    Add up coffee, tea, soda, energy drinks and chocolate to see how much caffeine you've had and how much is left under the 200 mg/day pregnancy limit.
  • Baby Weight-for-Age Percentile Calculator
    Find your baby's weight-for-age percentile (0–24 months) using WHO growth standards. Enter sex, age, and weight to get z-score and percentile.
  • Infant Length/Height-for-Age Percentile Calculator
    Estimate your baby's length or height-for-age percentile (0-24 months) using WHO growth standards, a z-score and the normal distribution.
  • Cost of Having a Baby Calculator
    Estimate the total cost of having a baby — medical bills, one-time gear, nursery and recurring monthly expenses — with this free first-year baby cost calculator.
  • Dog Pregnancy Week Calculator
    Find out what week of pregnancy your dog is in. Enter the breeding date and today's date to track gestation stage out of 9 weeks (≈63 days).
  • Chicken Egg Incubation & Hatch Date Calculator
    Calculate the hatch date for chicken eggs (21 days) and other poultry. Enter the set date and species to get your hatch day and lockdown date.
  • Pregnancy Weight Gain Tracker vs. Recommended
    Compare your actual pregnancy weight gain to IOM-recommended targets by week and pre-pregnancy BMI. See if you are on track, above, or below.
  • Pregnancy Weeks to Months Calculator
    Convert weeks pregnant to months instantly. Enter your gestational age in weeks to see how many months pregnant you are, using 4.34524 weeks per month.
  • Pregnancy Trimester Calculator
    Find your current pregnancy trimester from gestational weeks. 1st trimester weeks 1-13, 2nd weeks 14-27, 3rd weeks 28-40, plus weeks remaining.
  • Pregnancy Calorie Needs Calculator
    Estimate daily calorie needs during pregnancy by trimester. Uses Mifflin-St Jeor TDEE plus standard +340/+452 kcal add-ons. General guidance only.
  • Pregnancy Weeks to Months Calculator
    Convert pregnancy weeks to months instantly and find your trimester. Enter how many weeks pregnant you are to see months and the matching trimester.
  • Period Calculator
    Predict your next period start date, see your current cycle day, and view a multi-month calendar marking predicted period days based on your last period and cycle length.

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