Estimates, not diagnoses
Every result on this site is an estimate based on a published dating convention and the single date you enter. The calculators can’t take your medical history, scans or test results into account, and they can’t tell you an exact due date or an exact conception date.
Your healthcare team’s dates come first
If your midwife, doctor or fertility clinic has given you a due date or told you how far along you are, use the dates they give you. Clinical dating can draw on information a calculator doesn’t have, such as an early ultrasound.
Not a substitute for care
Nothing on this site replaces advice, diagnosis or treatment from a qualified healthcare professional. Don’t delay or decide against seeking care because of something you read or calculated here.
If you’re worried
If you have any concerns about your pregnancy or your health, contact your midwife, doctor or maternity service. If you think you need urgent help, contact your local emergency services.
About the information
Medical statements are linked to published sources, which are listed on each page. Content has not been reviewed by a named clinician. Read how content is sourced in the editorial policy.