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.



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What is the UK law on abortion?

Abortion is legal in England up to 24 weeks under the Abortion Act 1967. However, if there is a substantial risk to the woman's life or foetal abnormalities, there is no time limit.

There is also no age limit for treatment. Marie Stopes UK will see and offer treatment to those aged 12 and above. We strongly advise that under 16s have counselling before they make any decision to go ahead with treatment.  

  • Not all Marie Stopes UK centres offer abortion treatment up to 24 weeks - please call us on 0345 300 8090 (24 hrs) to find out more. 

When requesting an abortion, Marie Stopes UK will have to ask you for your reasons. This is required under the law.

Before an abortion can proceed, two doctors must ensure that the requirements of the Abortion Act are fulfilled, and they must both sign the relevant certificate. One of the doctors could be your GP and the other doctor will work at the hospital or clinic where the abortion will take place.

However, you can also self-refer for NHS-funded abortion treatment through Marie Stopes UK; we will process all the required paperwork.

Abortion law in Northern Ireland

Abortion is limited under the law in Northern Ireland. However, it is legal to travel to the UK to visit an abortion clinic.

Read more about abortion law in Northern Ireland. 

Need to talk about your options?

For more information about our services, please call us anytime on 0345 300 8090 (24 hrs), request a call back or email services@mariestopes.org.uk

We're here for you 24/7  – from the moment you dial our number to treatment aftercare.