Pregnancy & Baby Calculators
Explore free Pregnancy & Baby calculators for pregnancy dating, IVF due dates, ovulation and fertility timing, pregnancy weight-gain references, baby age, infant growth percentiles and child height. Choose a tool below, enter your information and get a clear estimate in seconds.
Due Date Calculator
Estimate an expected due date from the first day of the last menstrual period and average cycle length.
Pregnancy Calculator
Calculate current pregnancy progress, estimated due date, days remaining, and estimated conception date from LMP.
Pregnancy Week Calculator
Find the pregnancy week and day for any calendar date using an established estimated due date.
Conception Date Calculator
Estimate conception timing from an expected due date or from LMP and average cycle length.
IVF Due Date Calculator
Estimate an IVF due date from a known embryo transfer or retrieval/fertilization date.
Ovulation Calculator
Estimate an ovulation date from the first day of the last period and average menstrual-cycle length.
Fertile Window Calculator
Estimate a calendar-method fertile window from the shortest and longest menstrual cycles you have recorded.
Pregnancy Weight Gain Calculator
Compare pre-pregnancy BMI with recommended total singleton-pregnancy weight-gain ranges.
Pregnancy Trimester Calculator
Find the current trimester from LMP and a selected date, with trimester boundaries and an estimated due date.
Baby Age Calculator
Calculate a baby or child’s exact calendar age plus total days and weeks between birth and a selected date.
Baby Growth Percentile Calculator
Estimate infant weight-for-age or length-for-age percentile using CDC LMS reference data from birth through 36 months.
Child Height Predictor
Estimate mid-parental target adult height from mother and father heights using the AAP sex-specific formula.
About Our Pregnancy & Baby Calculators
This category brings together practical pregnancy dating, fertility timing, pregnancy wellness and child-growth reference tools. Use the Due Date Calculator, IVF Due Date Calculator, Ovulation Calculator and the Baby Growth Percentile Calculator for the appropriate estimate.
How to use these calculators
Choose the calculator that matches your question, enter the requested dates or measurements, and review the result together with the calculation explanation shown on that calculator page. Use accurate dates and measurements and pay close attention to the units requested by each tool.
Why estimates can differ
Pregnancy dating, fertility timing, weight-gain references and growth percentiles depend on established conventions, reference data and assumptions. Clinical information can change pregnancy dating, menstrual cycles vary, and child growth is best interpreted as a trend rather than from one isolated measurement.
- Due-date and pregnancy-week estimates depend on the dating method and reference date used.
- Ovulation and fertile-window tools estimate likely timing and cannot confirm ovulation or pregnancy.
- Pregnancy weight-gain guidance is based on pre-pregnancy BMI and singleton-pregnancy reference ranges.
- Growth percentiles are reference comparisons and should be interpreted with age, sex, measurement quality and clinical context.
Pregnancy & Baby Calculator FAQs
Are Pregnancy & Baby calculators free to use?
Yes. The calculators listed on this category page are intended to be free browser-based tools.
Are these calculators medical advice?
No. Results are general educational estimates and should not replace diagnosis, treatment or individualized advice from a qualified healthcare professional.
How is a pregnancy due date estimated?
A common LMP-based estimate uses 280 days from the first day of the last menstrual period for a 28-day cycle, with cycle-length and clinical dating considerations where appropriate.
Can ultrasound change a due date?
Yes. Clinical dating can be revised when ultrasound or assisted-reproduction timing provides a more appropriate basis for the estimated due date.
Are ovulation and fertile-window dates guaranteed?
No. Menstrual-cycle timing varies, so calendar methods estimate likely days rather than confirm ovulation or pregnancy.
What growth reference does the baby percentile calculator use?
The calculator uses CDC infant LMS reference parameters for weight-for-age or length-for-age from birth through 36 months.
Does the child height predictor guarantee adult height?
No. Mid-parental height is a reference estimate; genetics, health, nutrition and puberty timing can all affect adult height.
Can I use these calculators on my phone?
Yes. This category and its calculator pages are responsive and designed for phones, tablets, laptops and desktop screens.