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Reproductive Health Calculators

Private date and planning estimates for menstrual cycles and pregnancy.

Browse Reproductive Health Calculators

Pregnancy CalculatorEstimate pregnancy due and conception dates from menstrual dating.Pregnancy Weight Gain CalculatorCompare pregnancy weight change with broad singleton guidance ranges.Pregnancy Conception CalculatorEstimate conception and menstrual dates from an estimated due date.Due Date CalculatorEstimate a pregnancy due date from the last period and cycle length.Ovulation CalculatorEstimate ovulation and a possible fertile window from cycle dates.Conception CalculatorEstimate a possible conception window and corresponding due date.Period CalculatorProject future period dates from the latest cycle start and usual length.

Start here: practical tutorial

Treat cycle and pregnancy dates as planning estimates

Identify whether the source is a last-period record, cycle data or clinician-provided date. Enter it exactly and discuss meaningful discrepancies with a maternity professional.

  1. Choose the tool matching the input you have and the result you need.
  2. Confirm every unit, option and assumption before running it.
  3. Review the example, limitations and output before using the result.

Worked example

A last-period due-date estimate can differ from a dating scan because it assumes a conventional pregnancy length.

What this does not replace

The tools do not confirm pregnancy, fertility, ovulation, gestational age or medical status.

Estimate a due date