30 calculators
Pregnancy and fertility calculators
Every ShePrep calculator in one place — due dates, ovulation, growth percentiles and maternity pay. Each tool publishes its formula, not just an answer box.
BabyAdjusted age calculator for premature babiesWork out your premature baby's adjusted (corrected) age from their due date, plus actual age and…BabyBaby feeding amount calculatorWork out typical formula volumes by weight and age, shown in both ml and fl oz. Breastfeeding is…BabyBaby growth percentile calculatorWork out your baby’s weight, length and head circumference centiles on the UK-WHO, WHO or CDC…PregnancyBaby size by week calculatorHow big is your baby this week? NHS lengths and WHO 50th-centile weights from 14 weeks, in cm,…BabyBaby sleep schedule and wake window calculatorSuggested nap and bedtime windows by age, worked from your baby's wake-up time. Safe sleep guidance…PracticalBirth plan generatorBuild a printable birth plan: pain relief, birth positions, who is with you, cord clamping and…BabyBreast milk storage calculatorHow long does expressed breast milk keep? Get a use-by date and time for the fridge, freezer or…FertilityChance of conceiving by ageYour per-cycle and cumulative chance of conceiving, by age and months already trying, from NICE…PregnancyContraction timerTap to time contractions: length, gap between them, a rolling average of your last 5, and whether…DatingCrown-rump length (CRL) to gestational age calculatorConvert a crown-rump length in mm to gestational age using the Robinson and Fleming equation,…DatingDue date calculatorWork out your due date from your last period, a conception date, an early scan measurement or an…PregnancyEstimated fetal weight calculator (Hadlock)Estimated fetal weight from your scan measurements — BPD, HC, AC and FL — using all four Hadlock…PregnancyFetal growth percentile calculatorPlot an estimated fetal weight against gestational age on three growth charts at once — Hadlock,…PracticalFlying while pregnant: cut-off date calculatorEnter your due date and airline for the last date they will carry you, and when you need a…DatingGestational age calculatorWork out exactly how many weeks and days pregnant you are, from a due date, your last period or a…FertilityhCG doubling time calculatorEnter two hCG results and their dates to get your doubling time and 48-hour rise. Shows the real…PracticalHospital bag checklist generatorA printable hospital bag checklist filtered to your country, birth type, season and length of stay…FertilityImplantation date calculatorEnter your ovulation or period date to see your implantation window, the most likely days, and the…DatingIVF due date calculatorWork out your IVF due date from an embryo transfer or egg retrieval date. Day-3 adds 263 days,…PregnancyBaby movements counter (kick counter)Tap each movement and compare today with your own previous sessions. Read first: the NHS, RCOG and…PracticalMaternity leave and pay calculatorEarliest leave start date, notice deadlines, entitlement weeks and estimated pay for the UK, US,…FertilityOvulation and fertile window calculatorFind your fertile window and ovulation day from your last period. Built on 612,613 measured cycles,…FertilityPeriod predictorPredict your next 12 period dates from your last period and cycle length, each with the real margin…PregnancyPregnancy calorie needs calculatorHow many calories a day in pregnancy? Mifflin-St Jeor plus the real trimester increments. NHS says…DatingPregnancy weeks to months converterConvert pregnancy weeks and days into months and trimesters instantly. Full week 1 to 42 chart, and…PregnancyPregnancy weight gain calculatorYour pre-pregnancy BMI and the IOM/NASEM weight-gain range that goes with it, plus the gain…DatingReverse conception date calculatorWork backwards from a due date or a date of birth to the window in which conception happened. Gives…PregnancyRh factor and blood type compatibility calculatorEnter both parents' blood types to see whether Rh incompatibility is possible, whether anti-D is…FertilitySemen analysis calculator (WHO 2021)Check your semen analysis results against the WHO 2021 sixth-edition lower reference limits. Every…FertilityWhen to take a pregnancy testFind the earliest day a positive is plausible and the day a negative is finally reliable, with real…