Free pregnancy tools
Pregnancy calculators, explained gently
Work out your due date, ovulation window, implantation date, when to test, weight gain
Then read a plain-English explanation of what the number actually means.
Free · No sign-up · Every formula cited to ACOG, Mayo Clinic or the NHS
Guides
Wherever you are, start here
Seven sections covering trying to conceive through to the fourth trimester — written to be read when you are tired and worried, not when you are studying.
Trying to conceive
Honest, evidence-based guides to conceiving — realistic timelines, fertile-window mechanics, and when to seek help.
Unplanned pregnancy
Your options explained plainly and without steering, and where to find unbiased help near you.
Pregnancy week-by-week
What to expect each week, from week 1 through week 40.
Fetal development
How your baby grows — biology guides organized by stage and topic.
Healthy pregnancy
Eating, moving, travelling and sleeping well while pregnant — with the reasons, not just the rules.
Prenatal care
What happens at each appointment, who provides your care, and what to ask when you're there.
Prenatal tests & screening
NIPT, anatomy scan, amniocentesis and more — what they screen for and how to read results.
Complications & concerns
Calm, plain-language guides to gestational diabetes, preeclampsia and other pregnancy conditions.
Twins & multiples
How a twin or triplet pregnancy actually differs — monitoring, risks, and birth.
Giving birth
Stages of labor, pain management, induction, C-section — practical guides without judgment.
Postpartum & newborn care
Honest postpartum recovery, mental health, breastfeeding, and newborn-care guides.
Calculators
Ten tools, no sign-up
Each one runs in your browser, shows its working, and links to the medical source behind the formula.
Free pregnancy due date calculator using your last period and cycle length. Naegele's rule, the same formula your doctor uses.
Predict your fertile window, peak fertility days, and next period from your last menstrual period and cycle length.
Predict expected hCG levels or compare two test results to calculate doubling time in early pregnancy.
Estimate your due date from conception or IVF transfer — for when you've tracked ovulation precisely (266 days).
Work backward from your due date or last period to estimate when you conceived.
Estimate your implantation window and the earliest day a pregnancy test could turn positive.
Find the earliest date each kind of test (blood, sensitive home, standard home) will give a reliable result.
Find your BMI-based recommended pregnancy weight-gain range using the IOM 2009 guidelines. Track progress by week.
Try the Chinese gender calendar, Mayan method, and parent-traits predictor side by side. Just for fun.
The traditional Chinese gender chart with a calculator and the full 28×12 lookup table.
Reading
Latest from the blog
Short, sourced answers to the questions people actually type at 2am.
When Can You Actually Find Out Your Baby's Sex for Sure
Wondering when can you find out baby sex? Compare NIPT, anatomy scans, and folklore methods, with realistic timelines and accuracy for each approach today.
8 min readDoes Morning Sickness Really Predict Your Baby's Gender
Does morning sickness predict gender? Here's what the research actually shows, plus how to get a real answer with the babybumpkit gender predictor tool.
8 min readOld Wives' Tales About Baby Gender: Where They Came From
Old wives' tales about baby gender range from heart rate to cravings — here's where each one came from and what medical evidence actually says.
8 min readHow this is built
Why you can trust a number on this site
Not because we say so — because you can check it.
Every formula is cited
Each calculator names the authority behind its maths — ACOG, Mayo Clinic, the NHS or NIH MedlinePlus — and links to it. No citation on this site is invented.
Dated, and revised
Every page carries the date it was last reviewed, near the top where you can see it before you read.
Estimates, not diagnoses
Pregnancy dating is a range, not a fact. Nothing here replaces your midwife or doctor, and we never claim otherwise.