About Pregnancy Tools

Pregnancy Tools is a small, independent project building free, calm, no-signup pregnancy calculators — for the moments when you just need a quick answer without navigating an app store, creating an account, or wading through twenty pop-ups.

Why this site exists

Pregnancy is full of questions that have simple, well-defined math answers — when am I due, how many weeks am I, when's my fertile window, how long was that contraction. Most existing sites bury these tools under tracking forms, modal pop-ups, and aggressive newsletter prompts. We thought it should be easier than that.

How the calculations work

Our due date calculator uses Naegele's rule (LMP + 280 days, adjusted for cycle length), the same method most clinicians use. Our week tracker counts gestational age the standard way — from the first day of your last period, not from conception. Growth percentile data comes from the World Health Organization Child Growth Standards. We document the math openly on each tool page so you can verify it.

Not medical advice

Every calculator on this site is for general information only. Pregnancy is unique to every person — only your obstetrician, midwife, or pediatrician can give you advice that's right for you. If something feels wrong, call them. Always.

How this site is funded

We run on a small server and are supported by display ads. No tracking beyond what's needed to show those ads. No email signups. No premium tier. If the site helps you, the best thing you can do is share it with a friend who's expecting.

Contact

Questions, corrections, or suggestions? Email hello@pregnancytools.net or use the contact page.