Your pregnancy journey, calculated with care
7 medically accurate pregnancy calculators. From your first missed period to delivery day, we have every number you need.
Find out exactly when your baby is due using Naegele's rule. Enter your last menstrual period to get your estimated delivery date.
Calculate now →Predict your most fertile days and ovulation date based on your cycle length. Plan with confidence.
Calculate now →Estimate when conception likely occurred based on your due date or last period. See your fertile window.
Calculate now →See your full pregnancy timeline with trimester dates, milestones, and what to expect each stage.
Calculate now →Track healthy pregnancy weight gain based on IOM guidelines and your pre-pregnancy BMI category.
Calculate now →Count your baby's movements and track patterns. A simple tool to monitor fetal activity and well-being.
Calculate now →Time your contractions to track duration and frequency. Know when it's time to head to the hospital.
Calculate now →Built for expecting parents who want reliable answers without the noise.
Every calculator uses established medical formulas: Naegele's rule for due dates, IOM 2009 guidelines for weight gain, and ACOG-recommended kick counting protocols. The same methods your OB-GYN relies on.
No sign-ups, no accounts, no data stored on servers. All calculations happen entirely in your browser. Your pregnancy data never leaves your device.
From ovulation tracking through contraction timing. Seven purpose-built calculators covering preconception, each trimester, and labor readiness.
Each calculator includes clear explanations of the medical formulas used, what the results mean, and when to consult your healthcare provider.
Thousands of expecting parents use NestCalc every month to track their pregnancy milestones with confidence. No apps to download, no subscriptions -- just accurate, instant results.