Pregnancy Calculators
Every free calculator, tracker, and interactive tool on PregCalc, gathered in one place — from your first fertile-window estimate to a hospital-bag checklist for the day you meet your baby. Each tool is built on established obstetric formulas and reviewed against ACOG, NHS, Mayo Clinic, and IOM/NAM guidance.
Quick answer
If you only need one tool right now: use the Due Date Calculator once you know you’re pregnant, the Ovulation Calculator if you’re still trying to conceive, or the Pregnancy BMI Calculator to find your healthy weight-gain range. Everything else on this page is organized below by what stage of the journey it supports.
Your journey, mapped to the right tool
Dating & timeline calculators
Everything that establishes or tracks your dates, from a first missed period through the full 40-week countdown. These use the same LMP, ultrasound, conception, and IVF-transfer formulas your prenatal provider relies on.
Due Date Calculator
Estimate your EDD from your last period, conception date, ultrasound, or IVF transfer — four methods in one tool.
Open calculator → CalculatorGestational Age Calculator
Find out exactly how far along you are today, in weeks and days, from any of four dating methods.
Open calculator → CalculatorIVF Due Date Calculator
Due date dating based on Day-3 or Day-5 embryo transfer — the method fertility clinics use.
Open calculator → TrackerPregnancy Countdown Calculator
A running countdown of weeks and days left, with weekly fetal-development milestones as you go.
Open calculator →Fertility & conception calculators
For the trying-to-conceive stage and the first weeks after a positive test. These tools estimate ovulation, fertile windows, and early hormone patterns — useful for timing, but never a substitute for a fertility specialist if conception is taking longer than expected.
Ovulation Calculator
Estimate your most fertile days and predicted ovulation date from your average cycle and period length.
Open calculator → CalculatorConception Calculator
Estimate your most likely conception date and fertile window from your last period, cycle length, or due date.
Open calculator → CalculatorImplantation Calculator
Estimate your implantation window based on ovulation timing, and when a test is likely to detect hCG.
Open calculator → CalculatorFertility by Age Calculator
See how average monthly conception odds shift with age, based on published fertility-cohort research.
Open calculator → CalculatorhCG Doubling Time Calculator
Check whether two hCG readings are rising at a normal early-pregnancy rate, and what the pattern can and can’t tell you.
Open calculator →Growth, percentile & genetics calculators
Tools that track your baby’s growth against standard clinical curves (WHO, Hadlock), plus the lighter, fun-but-grounded genetics predictors people search for most.
Fetal Weight Percentile Calculator
Estimate your baby’s weight percentile from ultrasound biometry using the Hadlock formula, with an AGA/SGA/LGA growth chart.
Open calculator → CalculatorNewborn Growth Percentile Calculator
WHO-standard percentiles for weight, length, and head circumference from birth to 36 months.
Open calculator → PredictorBaby Eye Color Calculator
A genetics-based estimate of your baby’s likely eye color from both parents’ eye colors and family history.
Open calculator → PredictorBaby Gender Predictor
Chinese lunar calendar, heart-rate, and Mayan-calendar folklore predictions — paired with real accuracy data on ultrasound and NIPT.
Open calculator →Maternal health calculators
Tools focused on your own body during pregnancy — healthy weight-gain ranges, daily energy needs, and statistical risk estimates, all grounded in IOM/NAM and ACOG guidance.
Pregnancy BMI & Weight Gain Calculator
Find your pre-pregnancy BMI and recommended gestational weight-gain range for a singleton or twin pregnancy, per IOM/NAM guidelines.
Open calculator → CalculatorPregnancy Calorie Calculator
Estimate daily calorie needs by trimester, body size, and activity level, with a protein/carb/fat breakdown.
Open calculator → CalculatorMiscarriage Risk Calculator
A statistical estimate of continuing-pregnancy likelihood by gestational week and maternal age — population data, not a personal diagnosis.
Open calculator →Labor & delivery tools
For the final stretch: timing contractions against the 5-1-1 rule, logging fetal movement, and getting packed and ready before you head to the hospital or birth center.
Contraction Timer
Time contractions in real time and see your pattern checked automatically against the 5-1-1 rule.
Open tool → TrackerKick Counter
Time how long it takes to feel 10 movements — the at-home wellbeing check ACOG recommends in the third trimester.
Open tool → ChecklistHospital Bag Checklist
An interactive, printable packing list for mom, baby, and your support partner — organized by category and timing.
Open tool →Interactive trackers & guides
Two exploratory tools for understanding your pregnancy week by week and making sense of day-to-day symptoms, alongside the calculators above.
Pregnancy Week by Week
Slide through weeks 1–40 to see your baby’s size, development milestones, and what to expect in your body.
Explore → Interactive guidePregnancy Symptom Explainer
A trimester-by-trimester symptom checker explaining why each symptom happens and when it’s worth calling your provider.
Explore →No calculators match your search. Try a shorter term, like "due date" or "kick."
How accurate is each type of calculator?
Every calculator on this page uses an established clinical formula or population dataset — but “accurate” means something different depending on what’s being estimated. Dating tools narrow to a matter of days; growth and risk tools describe population patterns, not a guarantee for any individual pregnancy.