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

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I bought abortion pills online

We do not recommend that you take medical abortion pills without being under the supervision of a trained family planning professional.

We would advise you phone Marie Stopes before taking your first set of tablets. If you're from the UK, you can have an abortion under the NHS. If you have taken the pills and are concerned, please call our advice line or see your GP. 

Please read our Medical abortion explained section for in-depth information and advice. 

If you're unsure whether you want an abortion, we can provide abortion counselling

Need to talk about your options?

Our specialist staff are on hand 24/7 to offer expert advice and support – from your initial consultation to treatment aftercare.

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