Supporting you, Campaigning for all
• Campaigning for better births for all
• Protecting human rights in childbirth
• Independent information about pregnancy and birth
• Raising awareness of research

For a better birth

Latest Content

Journal

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Report of Parliamentary Debate on B…

AIMS Journal, 2024, Vol 36, No 1 By Elle Gundry The first parliamentary debate on birth trauma took place in the House of Commons on Thursday 19th October 2023. [1] Thank…

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Doulas supporting clients to make a…

AIMS Journal, 2024, Vol 36, No 1 By Anne Glover I work with women from all walks of life, but one thing that is important to them all, is having a positive and satisfying…

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My Complaint

AIMS Journal, 2024, Vol 36, No 1 Editor’s note: In this quite shocking account of disrespect and neglect, Grace describes the arrival of her first baby. With Grace’s perm…

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Events

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Priorities for improving maternity…

https://www.westminsterforumprojects.co.uk/conference/Maternity-24

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AIMS Workshop: History of Maternity…

Join us for the an interactive online AIMS workshop " History of Maternity Care since 1950 - How did we get here? " with Dr Tania Staras . If you have ever wondered why U…

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MaMA conference - 26/ 27 April 2024

MaMa Conference is the largest & longest running annual midwifery & maternity conference in the UK. Over the past 12 amazing years we have created an original and unique…

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Latest Campaigns

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What are the priorities for midwife…

AIMS is proud to be supporting the RCM's Research Prioritisation project as a Project Partner and with one of our volunteers on the Steering Group www.rcm.org.uk/promotin…

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Parliamentary Inquiry into Birth Tr…

Introduction to AIMS and why AIMS is making a submission Since 1960, AIMS has been the leading advocate for improvements in UK maternity care. We have national and intern…

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BICS Conference poster: AIMS Campai…

AIMS Campaigns Team volunteers are presenting a poster about our campaign for Physiology-Informed Maternity Services at the 2023 conference of the British Intrapartum Car…

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Pregnancy Calculator i

When's your due date?

What does your "due date" mean? How long is a normal pregnancy? How might being given a due date affect you and your baby? Enter the first day of your last period to discover when you're most likely to give birth.... and to find out more about due dates, induction and "post date" babies.
You are weeks pregnant.
Date of the first day of your last period
Adjusted cycle length

Date of the first day of your last period

The date of your last period allows an estimation of when you ovulated and conceived your baby.

A surprising number of women will have a bleed after they are pregnant, and although seeking advice from a doctor or midwife is recommended, usually this bleeding is not a problem.

Adjusted cycle length

Your menstrual cycle is counted from the first day of one period to the first day of the next. The average menstrual cycle is 28 days long, but many women will have longer or shorter cycles than this.

Ovulation usually takes place about 14 days before the next period. This means in a short cycle ovulation will be less than 14 days after your last period and with a long cycle more than 14 days after your last period. Giving the length of the cycle allows this to be taken into account in calculating your due date.

Many women have irregular cycles which make using the last day of their period less reliable for estimating due date.