Pregnancy Calculator
Use this free pregnancy calculator to estimate your due date and how far along you are from your last period.
Health information notice: Results are estimates based on general formulas and may not reflect individual circumstances. This tool is not a diagnosis or substitute for personalized advice from a qualified healthcare professional.
How the pregnancy calculator works
Due date = first day of last period + 280 days (adjusted if your cycle is not 28 days). Weeks pregnant are counted from that date to today.
Frequently asked questions
How accurate is a due date?
Only about 5% of babies arrive on the due date. Treat it as a guide and confirm with your midwife or doctor.
Results are estimates for general information only. They are not a substitute for professional advice where applicable. Found a mistake? Report an error.