Pregnancy & fertility calculators you can actually trust
From your first fertile window to your due date and beyond — clear, evidence-based tools and guides to help you plan, track and prepare, week by week.
- Reviewed by medical professionals
- No sign-up required
- Sourced from clinical guidelines
Quick due date
Enter the first day of your last period for an instant estimate.
An estimate only — only about 5% of babies arrive on their exact due date. Confirm dating with your provider.
Start with the calculator you need
Simple inputs, clear results, and plain-language explanations of what the numbers mean.
Due Date Calculator
Estimate your due date from your last period, cycle length or conception.
Open calculatorOvulation Calculator
Find your most fertile days and predicted ovulation date.
Open calculatorGestational Age Calculator
Check exactly how many weeks and days pregnant you are.
Open calculatorConception Calculator
Work back from your due date to estimate when you conceived.
Open calculatorIVF Due Date Calculator
Calculate your due date from an embryo transfer date.
Open calculatorPregnancy BMI Calculator
Track healthy pregnancy weight gain for your starting BMI.
Open calculatorContraction Timer
Time contraction length and frequency in real time.
Open calculatorKick Counter
Track your baby's movements with a simple kick count.
Open calculatorSupport for every stage
Whether you are trying to conceive, expecting, or preparing to meet your baby.
Trying to conceive
Understand your cycle, ovulation and fertility.
Pregnancy
Weekly development, symptoms and prenatal care.
Labor & new baby
Get ready for delivery and recovery.
Health information built on trust
Medically reviewed
Our content is reviewed by qualified clinicians before it is published. How we review
Evidence-based
Formulas and guidance follow recognised obstetric standards, with sources cited. Editorial policy
Private by design
Calculations run in your browser — we do not need your health data to give you an answer.
Made for real life
Plain language, mobile-friendly and free — no accounts, no paywalls.
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