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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Join our call to Make Women Matter

Women around the world are still facing some of the worst discrimination imaginable. From child marriage to female genital mutilation and inexcusably high rates of maternal mortality, the list goes on.

Change is sorely needed. Today, limited access to medical facilities and trained health workers means around 800 women are dying needlessly every day due to complications of pregnancy and childbirth. 

One of the simplest and most effective means of saving these women’s lives is contraception, but for more than 200 million women today that is not an option. In fact, if everyone who wanted to use contraception was able to, 79,000 women’s lives and 1.1 million infants’ lives could be saved in the developing world alone. 

Our campaign to Make Women Matter 

This International Women’s Day, Marie Stopes International launched a campaign calling on world leaders to ‘Make Women Matter’.

The United National General Assembly (UNGA) is due to meet in New York this September to decide what is to replace the Millennium Development Goals that were launched 15 years ago to tackle global poverty and inequality.

Of the eight goals, the fifth, to reduce maternal deaths and achieve universal access to reproductive health, is the most off-track, and the UNGA is a pivotal opportunity to give these issues the central position they deserve.

We are asking supporters to sign our petition calling for the next development agenda to deliver for women’s rights and empowerment by guaranteeing universal access to reproductive health and ending unsafe abortion.

Find out more about our campaign to Make Women Matter