Pregnancy Metrics · free educational tools

Pregnancy Calculators for Every Stage

Explore due dates, pregnancy weeks, IVF dating, ovulation, test timing, and weight-gain references with clear methods and limits.

Start here

Choose a calculator

Choose your task below

Pregnancy dates and weeks

Estimate a due date from your last period, ovulation, conception date, or a dated pregnancy record.

Find completed pregnancy weeks and days from a recorded due date or another dating record.

Estimate around when conception may have occurred from a due date or dating record.

Estimate a due date from a documented Day-3 or Day-5 embryo transfer.

More calculators

Estimate an ovulation date and fertile window from a usual menstrual cycle.

Find home-test timing from a period, ovulation, DPO, or recent sex.

See published weight-gain ranges based on pre-pregnancy BMI and pregnancy type.

Need a hand choosing?

Start with the information you already have. You do not need to enter personal dates here.

Check before you rely on a result

Methods & sources See the formulas and source references.Editorial responsibility Independent development; no external clinician certification is claimed.Browser-local privacy Calculations stay in your browser; optional weight tracking is stored locally only if enabled.Medical limits Educational estimates do not replace your care team's record or advice.

These four guides explain the assumptions behind the calculators. Each one links back to the tool it describes.

Pregnancy Dating Explained: Due Dates, Weeks & Conception — A plain-language guide to pregnancy weeks, due dates, conception estimates, ultrasound dating, and which due date to follow.
How IVF Due Dates Are Calculated — Day-3 and Day-5 transfer dating, FET timing, pregnancy age on transfer day, and when to use the clinic’s established due date.
Pregnancy Weight Gain Guidelines — A plain-language guide to singleton and twin weight-gain ranges, later-pregnancy rate context, and why individual recommendations can differ.
Trying, Ovulation and Pregnancy Test Timing — A plain-language guide to ovulation estimates, fertile windows, pregnancy-test timing, early negatives, and recent-sex fallback timing.