Gestation Calculator

This calculator has been designed to give you an idea of the treatment options available to you*. If you decide to have an abortion with Marie Stopes UK, one of our nurses will give a more approximate gestation date during your appointment by way of a scan.
*Please note that this online calculator will only give you an estimated gestation based on the details you have provided.

Please select the first day of your last menstrual period.



We are here to support you 24 hours a day, 7 days a week

Call us now on 0345 300 8090 or email services@mariestopes.org.uk

0345 300 8090

About Marie Stopes UK

Marie Stopes UK is the leading independent provider of sexual and reproductive health services in the UK.

Our Mission: Children by choice not chance 

Choice is fundamental to everything that we do. We respect the right of women to decide whether and when to have children. It’s about what is most suitable for each individual and for each couple; we give them the information they need to make their own choices.

Providing Care and Support throughout the UK

Our team of highly skilled doctors, nurses, counsellors and health care assistants provide reproductive and sexual health services through the NHS for over 100,000 women and men every year in our network of clinics around the UK.  

Abortion Care and Advice 

Our clients’ care and wellbeing are our driving passions, and we’re proud to say that 98% give our service the highest ratings. From the moment someone dials our number or walks through our door, they’re in safe, caring hands. Everything we do is based on our respect for our clients’ individual needs, their time, confidentiality and dignity. 

Thanks to the skill and expertise of our staff, our abortion care, vasectomy, and sexual health services are of the highest clinical standards in the country. We work closely with the Care Quality Commission to ensure we are delivering the highest standard of quality care we can. We also work in partnership with the NHS and other sexual health partners to improve our services and drive best practice.


Women using our services in the UK tell us that our free contraception consultation with a choice of method is hugely helpful and very important to them. About 50% more women leave us with the peace of mind and on-going protection of longer acting, more reliable methods of contraception than other community NHS contraception services.


We offer counselling services through our 24 hour advice line making us a truly integrated service, available day or night, every day of the year whenever our clients need us.

Our History

In 1976, our founder, visionary doctor Tim Black, stepped in to save the Marie Stopes Clinic in central London from which our clinic network grew.

Marie Stopes International

Around the world, women trust Marie Stopes International to provide them with a full range of quality sexual and reproductive health services. Our expert teams offer a full range of methods of contraception and provide women with access to safe abortion services (where legal) and post-abortion care.

Marie Stopes International works in almost 40 countries around the world providing life-saving services to millions of women in greatest need. It is thanks to the generosity of donors and funders who believe in what we do, that we were able to prevent 16,100 maternal deaths last year, and provide contraception for 18.1 million women worldwide. 

Visit our International Website

Read about our impact Internationally

Read about Our Governance