3 FOCUSED TOOLS
Pregnancy & cycle calendars calculators
Estimate pregnancy dates and regular-cycle calendar timings.
Choose the right calculation
These calendars cannot confirm pregnancy, identify all fertile days or diagnose cycle changes. They are unsuitable for contraception. A clinician-established pregnancy date takes precedence over a calendar estimate.
Find a tool for your question
Pregnancy Due Date Calculator
Estimate a pregnancy due date from the last menstrual period or a known conception date.
Ovulation Calculator
Estimate an ovulation date and an illustrative fertile window from a regular menstrual cycle.
Period Calculator
Estimate the next three period start dates from a typical regular cycle length.
Can a cycle calculator identify safe days for contraception?
No. Ovulation can shift and a calendar cannot reliably identify all fertile days. Use qualified advice about contraception.
Useful next steps in other categories
Kilograms to Pounds Converter
Convert kg to lb with an explicit conversion factor.
Centimetres to Feet and Inches Calculator
Express a non-negative height as whole feet and a decimal inch remainder.